{"id":3394,"date":"2025-11-19T07:32:49","date_gmt":"2025-11-19T07:32:49","guid":{"rendered":"https:\/\/nbaem.com\/?p=3394"},"modified":"2025-11-19T05:22:07","modified_gmt":"2025-11-19T05:22:07","slug":"what-factors-affect-the-properties-of-magnet","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/what-factors-affect-the-properties-of-magnet\/","title":{"rendered":"Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh ch\u1ea5t c\u1ee7a nam ch\u00e2m"},"content":{"rendered":"<p>B\u1ea1n \u0111\u00e3 t\u1eebng t\u1ef1 h\u1ecfi <strong>nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh ch\u1ea5t c\u1ee7a nam ch\u00e2m<\/strong>\u2014v\u00e0 t\u1ea1i sao m\u1ed9t s\u1ed1 nam ch\u00e2m \u0111\u1ed9t nhi\u00ean th\u1ea5t b\u1ea1i trong c\u00e1c \u1ee9ng d\u1ee5ng quan tr\u1ecdng? D\u00f9 b\u1ea1n l\u00e0 k\u1ef9 s\u01b0, chuy\u00ean gia Nghi\u00ean c\u1ee9u v\u00e0 Ph\u00e1t tri\u1ec3n, hay ng\u01b0\u1eddi mua k\u1ef9 thu\u1eadt, vi\u1ec7c hi\u1ec3u c\u00e1c y\u1ebfu t\u1ed1 k\u1ef9 thu\u1eadt c\u01a1 b\u1ea3n n\u00e0y l\u00e0 v\u00f4 c\u00f9ng quan tr\u1ecdng. T\u1eeb <strong>th\u00e0nh ph\u1ea7n v\u1eadt li\u1ec7u<\/strong> v\u00e0 <strong>c\u1ea5u tr\u00fac vi m\u00f4<\/strong> to <strong>t\u00e1c \u0111\u1ed9ng c\u1ee7a nhi\u1ec7t \u0111\u1ed9<\/strong> v\u00e0 <strong>kh\u00e1ng \u0103n m\u00f2n<\/strong>, m\u1ed7i y\u1ebfu t\u1ed1 h\u00ecnh th\u00e0nh n\u00ean \u0111\u1ed9 m\u1ea1nh, s\u1ef1 \u1ed5n \u0111\u1ecbnh v\u00e0 tu\u1ed5i th\u1ecd c\u1ee7a nam ch\u00e2m. Vi\u1ec7c n\u1eafm v\u1eefng \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 t\u1ea1o ra s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa hi\u1ec7u su\u1ea5t \u0111\u00e1ng tin c\u1eady v\u00e0 th\u1eddi gian ch\u1ebft t\u1ed1n k\u00e9m\u2014\u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi c\u00e1c lo\u1ea1i nam ch\u00e2m c\u00f3 y\u00eau c\u1ea7u cao nh\u01b0 <strong>NdFeB, SmCo, AlNiCo<\/strong>, ho\u1eb7c c\u00e1c lo\u1ea1i ferrite. Trong h\u01b0\u1edbng d\u1eabn n\u00e0y, ch\u00fang t\u00f4i s\u1ebd ph\u00e2n t\u00edch 8 y\u1ebfu t\u1ed1 ch\u00ednh ki\u1ec3m so\u00e1t t\u00ednh ch\u1ea5t c\u1ee7a nam ch\u00e2m v\u00e0 gi\u00fap b\u1ea1n \u0111\u01b0a ra c\u00e1c quy\u1ebft \u0111\u1ecbnh th\u00f4ng minh d\u1ef1a tr\u00ean d\u1eef li\u1ec7u cho thi\u1ebft k\u1ebf, ngu\u1ed3n cung \u1ee9ng v\u00e0 th\u00e0nh c\u00f4ng l\u00e2u d\u00e0i. H\u00e3y \u0111i th\u1eb3ng v\u00e0o tr\u1ecdng t\u00e2m c\u1ee7a nh\u1eefng \u0111i\u1ec1u th\u1ef1c s\u1ef1 quan tr\u1ecdng khi l\u1ef1a ch\u1ecdn ho\u1eb7c thi\u1ebft k\u1ebf nam ch\u00e2m v\u0129nh c\u1eedu v\u00e0o n\u0103m 2025.<\/p>\n<p><img decoding=\"async\" class=\"alignnone  wp-image-1208\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-1024x382.jpeg\" alt=\"thu\u1ed9c t\u00ednh t\u1eeb\" width=\"745\" height=\"278\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-200x75.jpeg 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-300x112.jpeg 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-400x149.jpeg 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-600x224.jpeg 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-768x286.jpeg 768w, https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-800x298.jpeg 800w, https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-1024x382.jpeg 1024w, https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-1200x448.jpeg 1200w, https:\/\/nbaem.com\/wp-content\/uploads\/2023\/02\/magnetic-property-1536x573.jpeg 1536w\" sizes=\"(max-width: 745px) 100vw, 745px\" \/><\/p>\n<h2>Th\u00e0nh ph\u1ea7n v\u1eadt li\u1ec7u v\u00e0 t\u1ef7 l\u1ec7 h\u1ee3p kim<\/h2>\n<p>T\u00ednh ch\u1ea5t c\u1ee7a nam ch\u00e2m ph\u1ee5 thu\u1ed9c nhi\u1ec1u v\u00e0o th\u00e0nh ph\u1ea7n v\u1eadt li\u1ec7u v\u00e0 t\u1ef7 l\u1ec7 h\u1ee3p kim c\u1ee7a ch\u00fang. C\u00e1c lo\u1ea1i nam ch\u00e2m kh\u00e1c nhau\u2014\u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c lo\u1ea1i hi\u1ebfm, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Ferrite_(magnet)\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff6600;\">s\u1eaft t\u1eeb<\/span><\/strong><\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Alnico\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff6600;\">AlNiCo<\/span><\/strong><\/a>, v\u00e0 <a href=\"https:\/\/en.wikipedia.org\/wiki\/Samarium%E2%80%93cobalt_magnet\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #ff6600;\">SmCo<\/span><\/strong><\/a>\u2014cung c\u1ea5p \u0111\u1eb7c t\u00ednh hi\u1ec7u su\u1ea5t kh\u00e1c nhau, khi\u1ebfn vi\u1ec7c l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u tr\u1edf n\u00ean c\u1ef1c k\u1ef3 quan tr\u1ecdng.<\/p>\n<p><strong>Nam ch\u00e2m \u0111\u1ea5t hi\u1ebfm<\/strong>, \u0111\u1eb7c bi\u1ec7t l\u00e0 <a href=\"https:\/\/en.wikipedia.org\/wiki\/Neodymium_magnet\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #ff6600;\"><strong>Neodymium-Iron-Boron (NdFeB)<\/strong><\/span><\/a>, chi\u1ebfm \u01b0u th\u1ebf trong c\u00e1c \u1ee9ng d\u1ee5ng hi\u1ec7u su\u1ea5t cao nh\u1edd s\u1ee9c m\u1ea1nh t\u1eeb tr\u01b0\u1eddng v\u01b0\u1ee3t tr\u1ed9i. C\u00e1c y\u1ebfu t\u1ed1 h\u1ee3p kim ch\u00ednh trong NdFeB bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Neodymium (Nd)<\/strong>: T\u0103ng c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb d\u01b0 (Br) \u0111\u1ec3 t\u1ea1o ra tr\u01b0\u1eddng t\u1eeb m\u1ea1nh h\u01a1n.<\/li>\n<li><strong>Dysprosium (Dy) v\u00e0 Terbium (Tb)<\/strong>: Th\u00eam m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 ch\u1ed1ng t\u1eeb (Hc), gi\u00fap nam ch\u00e2m ch\u1ed1ng m\u1ea5t t\u1eeb \u1edf nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n.<\/li>\n<li><strong>Cobalt (Co)<\/strong>: C\u1ea3i thi\u1ec7n \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n.<\/li>\n<li><strong>Boron (B)<\/strong>: \u1ed4n \u0111\u1ecbnh c\u1ea5u tr\u00fac tinh th\u1ec3, n\u00e2ng cao \u0111\u1ed9 c\u1ee9ng t\u1eeb.<\/li>\n<\/ul>\n<p>Vi\u1ec7c b\u1ed5 sung c\u00e1c nguy\u00ean t\u1ed1 hi\u1ebfm n\u1eb7ng nh\u01b0 Dy v\u00e0 Tb l\u00e0 r\u1ea5t quan tr\u1ecdng cho c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u <strong>\u0111\u1ed9 c\u1ea3n t\u1eeb cao<\/strong>, \u0111\u1eb7c bi\u1ec7t trong \u0111\u1ed9ng c\u01a1 v\u00e0 turbine gi\u00f3 ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi \u00e1p l\u1ef1c nhi\u1ec7t.<\/p>\n<p><strong>Nam ch\u00e2m ferrite<\/strong> cung c\u1ea5p kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t v\u1edbi chi ph\u00ed th\u1ea5p nh\u01b0ng c\u00f3 n\u0103ng l\u01b0\u1ee3ng s\u1ea3n ph\u1ea9m th\u1ea5p h\u01a1n so v\u1edbi nam ch\u00e2m hi\u1ebfm. Trong khi \u0111\u00f3, <strong>nam ch\u00e2m AlNiCo<\/strong> xu\u1ea5t s\u1eafc v\u1ec1 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t nh\u01b0ng k\u00e9m v\u1ec1 \u0111\u1ed9 ch\u1ed1ng t\u1eeb.<\/p>\n<p>\u0110\u1ed9 tinh khi\u1ebft v\u1eadt li\u1ec7u v\u00e0 ki\u1ec3m so\u00e1t oxy trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t l\u00e0 r\u1ea5t quan tr\u1ecdng. \u00d4 nhi\u1ec5m oxy l\u00e0m y\u1ebfu nam ch\u00e2m NdFeB, gi\u1ea3m c\u1ea3 \u0111\u1ed9 t\u1eeb d\u01b0 (Br) v\u00e0 \u0111\u1ed9 ch\u1ed1ng t\u1eeb (Hc). Kim lo\u1ea1i hi\u1ebfm tinh khi\u1ebft cao v\u00e0 qu\u1ea3n l\u00fd oxy nghi\u00eam ng\u1eb7t \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t t\u1eeb tr\u01b0\u1eddng \u1ed5n \u0111\u1ecbnh.<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i nam ch\u00e2m<\/th>\n<th>C\u00e1c y\u1ebfu t\u1ed1 h\u1ee3p kim ch\u00ednh<\/th>\n<th>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh<\/th>\n<th>\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>NdFeB<\/td>\n<td>Nd, Fe, B, Dy, Tb, Co<\/td>\n<td>Ch\u1ecbu nhi\u1ec7t cao v\u00e0 Hc, bi\u1ebfn \u0111\u1ed5i nhi\u1ec7t<\/td>\n<td>\u0110\u1ed9ng c\u01a1, c\u1ea3m bi\u1ebfn, \u0111i\u1ec7n t\u1eed<\/td>\n<\/tr>\n<tr>\n<td>SmCo<\/td>\n<td>Sm, Co<\/td>\n<td>\u1ed4n \u0111\u1ecbnh nhi\u1ec7t tuy\u1ec7t v\u1eddi, ch\u1ed1ng \u0103n m\u00f2n<\/td>\n<td>H\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, qu\u00e2n s\u1ef1<\/td>\n<\/tr>\n<tr>\n<td>AlNiCo<\/td>\n<td>Al, Ni, Co<\/td>\n<td>Kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t cao<\/td>\n<td>D\u1ee5ng c\u1ee5, loa<\/td>\n<\/tr>\n<tr>\n<td>S\u1eaft ferrit<\/td>\n<td>Oxit Fe, Ba ho\u1eb7c Sr<\/td>\n<td>Chi ph\u00ed th\u1ea5p, ch\u1ed1ng \u0103n m\u00f2n<\/td>\n<td>Thi\u1ebft b\u1ecb gia d\u1ee5ng, loa<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Hi\u1ec3u r\u00f5 t\u1ef7 l\u1ec7 h\u1ee3p kim ch\u00ednh x\u00e1c gi\u00fap b\u1ea1n ch\u1ecdn lo\u1ea1i nam ch\u00e2m ph\u00f9 h\u1ee3p v\u1edbi \u1ee9ng d\u1ee5ng c\u1ee7a m\u00ecnh v\u1ec1 \u0111\u1ed9 m\u1ea1nh t\u1eeb, m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t v\u00e0 y\u00eau c\u1ea7u \u0111\u1ed9 b\u1ec1n.<\/p>\n<h2>C\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 k\u00edch th\u01b0\u1edbc h\u1ea1t<\/h2>\n<p>C\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 k\u00edch th\u01b0\u1edbc h\u1ea1t c\u1ee7a nam ch\u00e2m \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh t\u00ednh ch\u1ea5t t\u1eeb c\u1ee7a n\u00f3. Trong nam ch\u00e2m nung ch\u1ea3y, <strong>s\u1eafp x\u1ebfp h\u1ea1t<\/strong> l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft\u2014h\u1ea1t s\u1eafp x\u1ebfp t\u1ed1t c\u1ea3i thi\u1ec7n \u0111\u1ed9 t\u1eeb d\u01b0 (Br) b\u1eb1ng c\u00e1ch cho ph\u00e9p c\u00e1c mi\u1ec1n t\u1eeb x\u1ebfp h\u00e0ng hi\u1ec7u qu\u1ea3 h\u01a1n, t\u1eeb \u0111\u00f3 t\u0103ng c\u01b0\u1eddng s\u1ee9c m\u1ea1nh t\u1ed5ng th\u1ec3 c\u1ee7a nam ch\u00e2m.<\/p>\n<p>M\u1ed9t y\u1ebfu t\u1ed1 kh\u00e1c l\u00e0 <strong>k\u1ef9 thu\u1eadt pha gi\u1edbi h\u1ea1n h\u1ea1t<\/strong>. Th\u00e0nh ph\u1ea7n v\u00e0 \u0111\u1ed9 d\u00e0y c\u1ee7a pha gi\u1edbi h\u1ea1n h\u1ea1t c\u00f3 th\u1ec3 n\u00e2ng cao kh\u1ea3 n\u0103ng ch\u1ed1ng kh\u1eed t\u1eeb (Hc) b\u1eb1ng c\u00e1ch c\u1ed1 \u0111\u1ecbnh c\u00e1c m\u1eb7t ph\u1eb3ng mi\u1ec1n t\u1eeb ho\u1eb7c l\u00e0m y\u1ebfu hi\u1ec7u su\u1ea5t n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a. V\u00ed d\u1ee5, ki\u1ec3m so\u00e1t c\u1ea9n th\u1eadn c\u00e1c gi\u1edbi h\u1ea1n h\u1ea1t trong nam ch\u00e2m NdFeB gi\u00fap c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb.<\/p>\n<p>Khi so s\u00e1nh <strong>c\u1ea5u tr\u00fac vi tinh th\u1ec3 v\u00e0 c\u1ea5u tr\u00fac vi m\u00f4 th\u00f4ng th\u01b0\u1eddng<\/strong>, nam ch\u00e2m vi tinh th\u1ec3 th\u01b0\u1eddng cung c\u1ea5p \u0111\u1ed9 c\u1ee9ng cao h\u01a1n v\u00e0 kh\u1ea3 n\u0103ng \u1ed5n \u0111\u1ecbnh nhi\u1ec7t t\u1ed1t h\u01a1n nh\u1edd v\u00e0o h\u1ea1t m\u1ecbn v\u00e0 c\u1ea5u tr\u00fac \u0111\u1ed3ng nh\u1ea5t. Tuy nhi\u00ean, c\u1ea5u tr\u00fac vi m\u00f4 th\u00f4ng th\u01b0\u1eddng \u0111\u00f4i khi \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng h\u01a1n v\u00ec d\u1ec5 ch\u1ebf t\u1ea1o ho\u1eb7c ti\u1ebft ki\u1ec7m chi ph\u00ed.<\/p>\n<p>C\u00e1c b\u01b0\u1edbc ch\u1ebf t\u1ea1o nh\u01b0 <strong>nghi\u1ec1n phun v\u00e0 n\u00e9n<\/strong> tr\u1ef1c ti\u1ebfp \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u1ea5u tr\u00fac vi m\u00f4. Nghi\u1ec1n phun gi\u1ea3m k\u00edch th\u01b0\u1edbc h\u1ea1t, th\u00fac \u0111\u1ea9y s\u1ef1 \u0111\u1ed3ng nh\u1ea5t c\u1ee7a h\u1ea1t t\u1ed1t h\u01a1n, trong khi n\u00e9n (tr\u1ee5c, \u0111\u1ed3ng b\u1ed9 ho\u1eb7c ngang) \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 c\u0103n ch\u1ec9nh h\u1ea1t v\u00e0 m\u1eadt \u0111\u1ed9. C\u00f9ng nhau, c\u00e1c qu\u00e1 tr\u00ecnh n\u00e0y c\u00f3 th\u1ec3 tinh ch\u1ec9nh hi\u1ec7u su\u1ea5t c\u1ee7a nam ch\u00e2m b\u1eb1ng c\u00e1ch n\u00e2ng cao t\u00ednh \u0111\u1ed3ng nh\u1ea5t t\u1eeb tr\u01b0\u1eddng v\u00e0 \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u nam ch\u00e2m hi\u1ec7u su\u1ea5t cao, vi\u1ec7c hi\u1ec3u v\u00e0 ki\u1ec3m so\u00e1t c\u1ea5u tr\u00fac vi m\u00f4 l\u00e0 ch\u00eca kh\u00f3a. N\u1ebfu b\u1ea1n l\u00e0m vi\u1ec7c v\u1edbi nam ch\u00e2m trong m\u00f4i tr\u01b0\u1eddng \u0111\u00f2i h\u1ecfi cao, h\u00e3y xem x\u00e9t c\u00e1ch c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c \u0111\u1eb7c t\u00ednh cu\u1ed1i c\u00f9ng c\u1ee7a nam ch\u00e2m v\u00e0 t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 <a href=\"https:\/\/nbaem.com\/vi\/magnets-used-in-renewable-energy\/\" target=\"_blank\" rel=\"noopener\">nam ch\u00e2m s\u1eed d\u1ee5ng trong n\u0103ng l\u01b0\u1ee3ng t\u00e1i t\u1ea1o<\/a> \u0111\u1ec3 c\u00f3 c\u00e1i nh\u00ecn s\u00e2u h\u01a1n v\u1ec1 c\u00e1c y\u00eau c\u1ea7u c\u1ea5u tr\u00fac vi m\u00f4 ti\u00ean ti\u1ebfn.<\/p>\n<h2>Quy tr\u00ecnh s\u1ea3n xu\u1ea5t<\/h2>\n<p><img decoding=\"async\" class=\"alignnone  wp-image-1106\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1-1024x688.jpg\" alt=\"M\u00e1y c\u1eaft d\u00e2y kim c\u01b0\u01a1ng nhi\u1ec1u l\u1edbp\" width=\"564\" height=\"379\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1-200x134.jpg 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1-300x202.jpg 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1-400x269.jpg 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1-600x403.jpg 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1-768x516.jpg 768w, https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1-800x538.jpg 800w, https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1-1024x688.jpg 1024w, https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1-1200x807.jpg 1200w, https:\/\/nbaem.com\/wp-content\/uploads\/2022\/07\/Multiple-Diamond-Wire-Saw-1.jpg 1440w\" sizes=\"(max-width: 564px) 100vw, 564px\" \/><\/p>\n<p>Qu\u00e1 tr\u00ecnh ch\u1ebf t\u1ea1o \u0111\u00f3ng vai tr\u00f2 l\u1edbn trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1eb7c t\u00ednh cu\u1ed1i c\u00f9ng c\u1ee7a nam ch\u00e2m. M\u1ed9t \u0111i\u1ec3m ph\u00e2n bi\u1ec7t ch\u00ednh l\u00e0 gi\u1eefa <strong>nam ch\u00e2m sintered v\u00e0 nam ch\u00e2m li\u00ean k\u1ebft<\/strong>. Nam ch\u00e2m sintered th\u01b0\u1eddng cho hi\u1ec7u su\u1ea5t t\u1eeb tr\u01b0\u1eddng cao h\u01a1n v\u00ec c\u00e1c h\u1ea1t c\u1ee7a ch\u00fang \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i ch\u1eb7t ch\u1ebd v\u00e0 c\u0103n ch\u1ec9nh t\u1ed1t, \u0111i\u1ec1u n\u00e0y t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb d\u01b0 (Br) v\u00e0 \u0111\u1ed9 c\u1ee9ng t\u1eeb (Hc). Nam ch\u00e2m li\u00ean k\u1ebft, m\u1eb7t kh\u00e1c, \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng c\u00e1ch tr\u1ed9n b\u1ed9t t\u1eeb v\u1edbi ch\u1ea5t k\u1ebft d\u00ednh polymer. Ch\u00fang d\u1ec5 \u0111\u1ecbnh h\u00ecnh h\u01a1n v\u00e0 r\u1ebb h\u01a1n nh\u01b0ng th\u01b0\u1eddng c\u00f3 n\u0103ng l\u01b0\u1ee3ng t\u1ed1i \u0111a (BHmax) th\u1ea5p h\u01a1n.<\/p>\n<p>M\u1ed9t trong nh\u1eefng b\u01b0\u1edbc quan tr\u1ecdng trong vi\u1ec7c ch\u1ebf t\u1ea1o nam ch\u00e2m sintered, \u0111\u1eb7c bi\u1ec7t l\u00e0 lo\u1ea1i NdFeB, l\u00e0 <strong>gi\u1ea3m n\u1ee9t hydrogen<\/strong>. Qu\u00e1 tr\u00ecnh n\u00e0y ph\u00e1 v\u1ee1 c\u00e1c kh\u1ed1i h\u1ee3p kim l\u1edbn th\u00e0nh b\u1ed9t m\u1ecbn b\u1eb1ng c\u00e1ch h\u1ea5p th\u1ee5 hydrogen, gi\u00fap nghi\u1ec1n d\u1ec5 h\u01a1n v\u00e0 c\u1ea3i thi\u1ec7n t\u00ednh \u0111\u1ed3ng nh\u1ea5t t\u1eeb tr\u01b0\u1eddng. Sau \u0111\u00f3, <strong>nghi\u1ec1n phun<\/strong> l\u00e0m m\u1ecbn b\u1ed9t h\u01a1n, ki\u1ec3m so\u00e1t k\u00edch th\u01b0\u1edbc h\u1ea1t \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a c\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 t\u00ednh ch\u1ea5t t\u1eeb tr\u01b0\u1eddng.<\/p>\n<p>Nhi\u1ec7t \u0111\u1ed9 v\u00e0 th\u1eddi gian nung sintering c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u1ea5u tr\u00fac vi m\u00f4. Sintering qu\u00e1 cao ho\u1eb7c kh\u00f4ng \u0111\u1ec1u c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn s\u1ef1 ph\u00e1t tri\u1ec3n h\u1ea1t ho\u1eb7c l\u1ed7i, l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t. Vi\u1ec7c ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p <strong>n\u00e9n<\/strong> ph\u00f9 h\u1ee3p l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 c\u0103n ch\u1ec9nh h\u1ea1t \u0111\u00fang c\u00e1ch:<\/p>\n<ul>\n<li><strong>N\u00e9n tr\u1ee5c<\/strong> c\u0103n ch\u1ec9nh h\u1ea1t theo m\u1ed9t tr\u1ee5c, c\u1ea3i thi\u1ec7n h\u01b0\u1edbng t\u1eeb tr\u01b0\u1eddng.<\/li>\n<li><strong>\u00c9p th\u1ee7y l\u1ef1c c\u00e2n b\u1eb1ng<\/strong> b\u1ecb n\u00e9n \u0111\u1ec1u theo t\u1ea5t c\u1ea3 c\u00e1c h\u01b0\u1edbng, cung c\u1ea5p m\u1eadt \u0111\u1ed9 \u0111\u1ed3ng \u0111\u1ec1u.<\/li>\n<li><strong>\u00c9p ngang<\/strong> b\u1ecb n\u00e9n vu\u00f4ng g\u00f3c v\u1edbi tr\u1ee5c t\u1eeb tr\u01b0\u1eddng \u01b0u ti\u00ean, \u00edt ph\u1ed5 bi\u1ebfn h\u01a1n nh\u01b0ng h\u1eefu \u00edch cho c\u00e1c h\u00ecnh d\u1ea1ng \u0111\u1eb7c bi\u1ec7t.<\/li>\n<\/ul>\n<p>Sau khi \u00e9p v\u00e0 nung k\u1ebft <strong>x\u1eed l\u00fd nhi\u1ec7t v\u00e0 t\u00f4i luy\u1ec7n<\/strong> c\u00e1c b\u01b0\u1edbc n\u00e0y gi\u00fap gi\u1ea3m thi\u1ec3u \u1ee9ng su\u1ea5t n\u1ed9i b\u1ed9 v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u1ed9 c\u1ee9ng t\u1eeb, c\u0169ng nh\u01b0 \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc. C\u00e1c giai \u0111o\u1ea1n n\u00e0y \u0111i\u1ec1u ch\u1ec9nh ph\u00e2n b\u1ed1 c\u00e1c nguy\u00ean t\u1ed1 t\u1ea1i c\u00e1c r\u00eca h\u1ea1t, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb c\u1ee7a nam ch\u00e2m.<\/p>\n<p>\u0110\u1ed1i v\u1edbi nh\u1eefng ng\u01b0\u1eddi quan t\u00e2m \u0111\u1ebfn t\u00e1c \u0111\u1ed9ng th\u1ef1c t\u1ebf c\u1ee7a c\u00e1c l\u1ef1a ch\u1ecdn s\u1ea3n xu\u1ea5t n\u00e0y, vi\u1ec7c hi\u1ec3u c\u00e1ch c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y li\u00ean quan \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 m\u00e1y ph\u00e1t \u0111i\u1ec7n l\u00e0 r\u1ea5t quan tr\u1ecdng. Kh\u00e1m ph\u00e1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng chi ti\u1ebft c\u1ee7a m\u1ed9t <a href=\"https:\/\/nbaem.com\/vi\/overview-for-magnetic-generator\/\">m\u00e1y ph\u00e1t t\u1eeb<\/a> c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n h\u00ecnh dung r\u00f5 h\u01a1n t\u1ea1i sao ch\u1ea5t l\u01b0\u1ee3ng nam ch\u00e2m l\u1ea1i quan tr\u1ecdng trong c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf.<\/p>\n<h2>Nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t c\u1ee7a nam ch\u00e2m<\/h2>\n<p>Nhi\u1ec7t \u0111\u1ed9 \u0111\u00f3ng vai tr\u00f2 l\u1edbn trong hi\u1ec7u su\u1ea5t c\u1ee7a nam ch\u00e2m theo th\u1eddi gian. M\u1ed7i lo\u1ea1i v\u1eadt li\u1ec7u t\u1eeb c\u00f3 m\u1ed9t <strong>nhi\u1ec7t \u0111\u1ed9 Curie<\/strong>\u2014 \u0111i\u1ec3m m\u00e0 n\u00f3 m\u1ea5t ho\u00e0n to\u00e0n t\u1eeb t\u00ednh. V\u00ed d\u1ee5, nam ch\u00e2m NdFeB th\u01b0\u1eddng c\u00f3 nhi\u1ec7t \u0111\u1ed9 Curie kho\u1ea3ng 310-400\u00b0C, trong khi nam ch\u00e2m SmCo c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c t\u1edbi 700\u00b0C. Hi\u1ec3u \u0111i\u1ec1u n\u00e0y gi\u00fap ch\u00fang ta tr\u00e1nh \u0111\u1ea9y nam ch\u00e2m v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n c\u1ee7a ch\u00fang.<\/p>\n<p>Nam ch\u00e2m c\u0169ng tr\u1ea3i qua <strong>m\u1ea5t t\u1eeb c\u00f3 th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c v\u00e0 kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c<\/strong> khi b\u1ecb nung n\u00f3ng. M\u1ea5t t\u1eeb c\u00f3 th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c ngh\u0129a l\u00e0 \u0111\u1ed9 m\u1ea1nh c\u1ee7a nam ch\u00e2m gi\u1ea3m khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng nh\u01b0ng s\u1ebd ph\u1ee5c h\u1ed3i khi l\u00e0m m\u00e1t. M\u1ea5t t\u1eeb kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c x\u1ea3y ra khi nam ch\u00e2m qu\u00e1 n\u00f3ng qu\u00e1 m\u1ee9c, g\u00e2y h\u01b0 h\u1ecfng v\u0129nh vi\u1ec5n c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb c\u1ee7a n\u00f3.<\/p>\n<p>c\u1ea3 <strong>nhi\u1ec7t \u0111\u1ed9 v\u1eadn h\u00e0nh t\u1ed1i \u0111a (MOT)<\/strong> thay \u0111\u1ed5i theo c\u1ea5p \u0111\u1ed9 nam ch\u00e2m. C\u00e1c c\u1ea5p nh\u01b0 N (th\u01b0\u1eddng), M (trung b\u00ecnh) ho\u1ea1t \u0111\u1ed9ng t\u1ed1t \u1edf kho\u1ea3ng 80-100\u00b0C, trong khi c\u00e1c c\u1ea5p H (cao), SH (si\u00eau cao), UH (t\u1ed1i cao), v\u00e0 EH (c\u1ef1c cao) c\u00f3 th\u1ec3 v\u1eadn h\u00e0nh an to\u00e0n \u1edf nhi\u1ec7t \u0111\u1ed9 ng\u00e0y c\u00e0ng cao h\u01a1n\u2014\u0111\u00f4i khi l\u00ean t\u1edbi 200\u00b0C ho\u1eb7c h\u01a1n. H\u1ec7 th\u1ed1ng ph\u00e2n lo\u1ea1i n\u00e0y gi\u00fap b\u1ea1n ch\u1ecdn nam ch\u00e2m ph\u00f9 h\u1ee3p v\u1edbi \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 c\u1ee7a thi\u1ebft b\u1ecb m\u00e0 kh\u00f4ng g\u00e2y m\u1ea5t t\u1eeb.<\/p>\n<p>Hai y\u1ebfu t\u1ed1 quan tr\u1ecdng li\u00ean quan \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 l\u00e0 <strong>h\u1ec7 s\u1ed1 nhi\u1ec7t c\u1ee7a \u0111\u1ed9 t\u1eeb d\u01b0 (Br)<\/strong> v\u00e0 <strong>\u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb (Hc)<\/strong>. Br th\u01b0\u1eddng gi\u1ea3m kho\u1ea3ng 0.1% m\u1ed7i \u00b0C, c\u00f3 ngh\u0129a l\u00e0 t\u1eeb tr\u01b0\u1eddng c\u00f2n l\u1ea1i c\u1ee7a nam ch\u00e2m y\u1ebfu \u0111i khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng. Hc gi\u1ea3m c\u00f2n nhanh h\u01a1n, \u0111i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i c\u00e1c tr\u01b0\u1eddng t\u1eeb b\u00ean ngo\u00e0i v\u00e0 qu\u00e1 tr\u00ecnh m\u1ea5t t\u1eeb. C\u00e1c v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho nhi\u1ec7t \u0111\u1ed9 cao th\u01b0\u1eddng c\u00f3 th\u00e0nh ph\u1ea7n \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 gi\u1ea3m thi\u1ec3u nh\u1eefng t\u1ed5n th\u1ea5t n\u00e0y.<\/p>\n<p>L\u1ef1a ch\u1ecdn lo\u1ea1i ph\u00f9 h\u1ee3p d\u1ef1a tr\u00ean nhi\u1ec7t \u0111\u1ed9 v\u1eadn h\u00e0nh d\u1ef1 ki\u1ebfn l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u su\u1ea5t l\u00e2u d\u00e0i. \u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 hi\u1ec7u su\u1ea5t c\u1ee7a nam ch\u00e2m v\u00e0 t\u1ea1o n\u0103ng l\u01b0\u1ee3ng, h\u00e3y xem t\u00e0i nguy\u00ean n\u00e0y v\u1ec1 vi\u1ec7c t\u1ea1o n\u0103ng l\u01b0\u1ee3ng t\u1eeb nam ch\u00e2m.<\/p>\n<h2>Tr\u01b0\u1eddng t\u1eeb b\u00ean ngo\u00e0i &amp; R\u1ee7i ro m\u1ea5t t\u1eeb<\/h2>\n<p>M\u1ed9t y\u1ebfu t\u1ed1 ch\u00ednh \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a nam ch\u00e2m l\u00e0 ti\u1ebfp x\u00fac v\u1edbi tr\u01b0\u1eddng t\u1eeb b\u00ean ngo\u00e0i, c\u00f3 th\u1ec3 g\u00e2y m\u1ea5t t\u1eeb m\u1ed9t ph\u1ea7n ho\u1eb7c ho\u00e0n to\u00e0n. The <strong>\u0111\u01b0\u1eddng cong m\u1ea5t t\u1eeb<\/strong> minh h\u1ecda c\u00e1ch m\u00e0 t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m y\u1ebfu \u0111i khi m\u1ed9t tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i l\u1eadp \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng. \u0110i\u1ec3m <strong>g\u00f3c g\u00e3y<\/strong> tr\u00ean \u0111\u01b0\u1eddng cong n\u00e0y \u0111\u00e1nh d\u1ea5u n\u01a1i b\u1eaft \u0111\u1ea7u m\u1ea5t t\u1eeb kh\u00f4ng th\u1ec3 ph\u1ee5c h\u1ed3i, khi\u1ebfn vi\u1ec7c v\u1eadn h\u00e0nh nam ch\u00e2m trong gi\u1edbi h\u1ea1n an to\u00e0n l\u00e0 r\u1ea5t quan tr\u1ecdng.<\/p>\n<p>Trong c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf nh\u01b0 \u0111\u1ed9ng c\u01a1 \u0111i\u1ec7n, <strong>ph\u1ea3n \u1ee9ng c\u1ee7a ph\u1ea7n \u1ee9ng<\/strong> t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i l\u1eadp c\u00f3 th\u1ec3 \u0111\u1ea9y nam ch\u00e2m v\u1ec1 g\u1ea7n \u0111i\u1ec3m g\u00e3y n\u00e0y. R\u1ee7i ro n\u00e0y t\u0103ng l\u00ean khi t\u1ea3i tr\u1ecdng v\u00e0 d\u00f2ng \u0111i\u1ec7n t\u0103ng, v\u00ec v\u1eady vi\u1ec7c thi\u1ebft k\u1ebf nam ch\u00e2m v\u1edbi <strong>kho\u1ea3ng c\u00e1ch c\u01b0\u1ee1ng t\u1eeb n\u1ed9i t\u1ea1i (Hci)<\/strong> \u0111\u1ee7 l\u1edbn l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 ch\u1ed1ng l\u1ea1i c\u00e1c tr\u01b0\u1eddng \u0111\u1ed1i l\u1eadp n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<h3>C\u00e1ch ch\u1ecdn kho\u1ea3ng c\u00e1ch Hci ph\u00f9 h\u1ee3p<\/h3>\n<ul>\n<li><strong>Hi\u1ec3u r\u00f5 \u0111i\u1ec1u ki\u1ec7n v\u1eadn h\u00e0nh:<\/strong> Nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n v\u00e0 tr\u01b0\u1eddng \u0111\u1ed1i l\u1eadp m\u1ea1nh h\u01a1n y\u00eau c\u1ea7u nam ch\u00e2m c\u00f3 Hci l\u1edbn h\u01a1n.<\/li>\n<li><strong>Ch\u1ecdn lo\u1ea1i nam ch\u00e2m ph\u00f9 h\u1ee3p:<\/strong> C\u00e1c lo\u1ea1i c\u00f3 \u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb cao h\u01a1n (v\u00ed d\u1ee5: H, SH, UH) cung c\u1ea5p kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb t\u1ed1t h\u01a1n nh\u01b0ng th\u01b0\u1eddng c\u00f3 chi ph\u00ed cao h\u01a1n.<\/li>\n<li><strong>Xem x\u00e9t c\u00e1c y\u1ebfu t\u1ed1 an to\u00e0n:<\/strong> Bi\u00ean \u0111\u1ed9 20-30% tr\u00ean tr\u01b0\u1eddng ch\u1ed1ng m\u1ea5t t\u1eeb l\u1edbn nh\u1ea5t d\u1ef1 ki\u1ebfn l\u00e0 m\u1ed9t th\u1ef1c h\u00e0nh k\u1ef9 thu\u1eadt ph\u1ed5 bi\u1ebfn.<\/li>\n<li><strong>Thi\u1ebft k\u1ebf cho \u1ee9ng d\u1ee5ng:<\/strong> \u0110\u1ed9ng c\u01a1 v\u00e0 m\u00e1y ph\u00e1t \u0111i\u1ec7n \u0111\u1eb7c bi\u1ec7t c\u1ea7n nam ch\u00e2m c\u00f3 Hci cao h\u01a1n nhi\u1ec1u so v\u1edbi tr\u01b0\u1eddng l\u00e0m vi\u1ec7c \u0111\u1ec3 tr\u00e1nh m\u1ea5t hi\u1ec7u su\u1ea5t v\u00e0 h\u01b0 h\u1ecfng.<\/li>\n<\/ul>\n<p>C\u00e2n b\u1eb1ng c\u1ea5p \u0111\u1ed9 nam ch\u00e2m v\u00e0 \u0111\u1ed9 c\u1ee9ng t\u1eeb \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t l\u00e2u d\u00e0i m\u00e0 kh\u00f4ng g\u1eb7p r\u1ee7i ro m\u1ea5t t\u1eeb kh\u00f4ng th\u1ec3 ph\u1ee5c h\u1ed3i. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng nh\u1ea1y c\u1ea3m v\u1edbi tr\u01b0\u1eddng t\u1eeb b\u00ean ngo\u00e0i, vi\u1ec7c hi\u1ec3u r\u00f5 \u0111\u01b0\u1eddng cong m\u1ea5t t\u1eeb v\u00e0 bi\u00ean \u0111\u1ed9 Hci gi\u00fap t\u1ed1i \u01b0u h\u00f3a c\u1ea3 \u0111\u1ed9 b\u1ec1n v\u00e0 hi\u1ec7u qu\u1ea3.<\/p>\n<h2>L\u1edbp ph\u1ee7 b\u1ec1 m\u1eb7t v\u00e0 B\u1ea3o v\u1ec7 ch\u1ed1ng \u0103n m\u00f2n<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-2779\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/09\/NdFeB_Magnets_Wind_Generator_Cases_sBj0UB0nd.webp\" alt=\"\" width=\"623\" height=\"380\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/09\/NdFeB_Magnets_Wind_Generator_Cases_sBj0UB0nd-18x12.webp 18w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/09\/NdFeB_Magnets_Wind_Generator_Cases_sBj0UB0nd-200x122.webp 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/09\/NdFeB_Magnets_Wind_Generator_Cases_sBj0UB0nd-300x183.webp 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/09\/NdFeB_Magnets_Wind_Generator_Cases_sBj0UB0nd-400x244.webp 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/09\/NdFeB_Magnets_Wind_Generator_Cases_sBj0UB0nd-600x366.webp 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/09\/NdFeB_Magnets_Wind_Generator_Cases_sBj0UB0nd.webp 623w\" sizes=\"(max-width: 623px) 100vw, 623px\" \/><\/p>\n<p>L\u1edbp ph\u1ee7 b\u1ec1 m\u1eb7t \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c b\u1ea3o v\u1ec7 nam ch\u00e2m kh\u1ecfi \u0103n m\u00f2n, \u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi c\u00e1c v\u1eadt li\u1ec7u nh\u1ea1y c\u1ea3m nh\u01b0 NdFeB d\u1ec5 b\u1ecb r\u1ec9 s\u00e9t v\u00e0 suy gi\u1ea3m. C\u00e1c l\u1edbp ph\u1ee7 ph\u1ed5 bi\u1ebfn bao g\u1ed3m <strong>NiCuNi (k\u1ebdm-nikel-k\u1ebdm)<\/strong>, <strong>k\u1ebdm (Zn)<\/strong>, <strong>s\u01a1n epoxy<\/strong>, v\u00e0 c\u00e1c l\u1edbp ph\u1ee7 chuy\u00ean d\u1ee5ng nh\u01b0 <strong>Everlube<\/strong> ho\u1eb7c c\u00e1c ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd k\u1ebft h\u1ee3p nh\u01b0 <strong>b\u1ea3o v\u1ec7 b\u1ec1 m\u1eb7t (passivation) sau \u0111\u00f3 ph\u1ee7 epoxy<\/strong>.<\/p>\n<ul>\n<li><strong>L\u1edbp ph\u1ee7 NiCuNi<\/strong> cung c\u1ea5p kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n xu\u1ea5t s\u1eafc v\u00e0 b\u1ea3o v\u1ec7 m\u00e0i m\u00f2n t\u1ed1t, l\u00e0 l\u1ef1a ch\u1ecdn ph\u1ed5 bi\u1ebfn cho nam ch\u00e2m neodymium.<\/li>\n<li><strong>L\u1edbp ph\u1ee7 k\u1ebdm<\/strong> cung c\u1ea5p m\u1ee9c \u0111\u1ed9 b\u1ea3o v\u1ec7 trung b\u00ecnh, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t l\u1ef1a ch\u1ecdn ti\u1ebft ki\u1ec7m chi ph\u00ed nh\u01b0ng \u00edt b\u1ec1n h\u01a1n c\u00e1c l\u1edbp ph\u1ee7 d\u1ef1a tr\u00ean niken.<\/li>\n<li><strong>L\u1edbp ph\u1ee7 epoxy<\/strong> l\u00e0 l\u00fd t\u01b0\u1edfng cho m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t, bao g\u1ed3m ti\u1ebfp x\u00fac v\u1edbi \u0111\u1ed9 \u1ea9m v\u00e0 h\u00f3a ch\u1ea5t. Ch\u00fang t\u1ea1o th\u00e0nh m\u1ed9t h\u00e0ng r\u00e0o v\u1eefng ch\u1eafc nh\u01b0ng c\u00f3 th\u1ec3 m\u00e0i m\u00f2n d\u1ec5 h\u01a1n trong c\u00e1c \u1ee9ng d\u1ee5ng c\u01a1 kh\u00ed.<\/li>\n<li>C\u00e1c ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd ti\u00ean ti\u1ebfn nh\u01b0 <strong>b\u1ea3o v\u1ec7 b\u1ec1 m\u1eb7t (passivation) c\u1ed9ng v\u1edbi epoxy<\/strong> k\u1ebft h\u1ee3p nh\u1eefng \u0111i\u1ec1u t\u1ed1t nh\u1ea5t c\u1ee7a c\u1ea3 hai th\u1ebf gi\u1edbi, \u0111\u1ea3m b\u1ea3o s\u1ef1 \u1ed5n \u0111\u1ecbnh h\u00f3a h\u1ecdc v\u00e0 b\u1ea3o v\u1ec7 v\u1eadt l\u00fd.<\/li>\n<\/ul>\n<p>Trong th\u1eed nghi\u1ec7m \u0103n m\u00f2n, ch\u1eb3ng h\u1ea1n nh\u01b0 <strong>ki\u1ec3m tra phun mu\u1ed1i<\/strong>, nam ch\u00e2m v\u1edbi l\u1edbp ph\u1ee7 NiCuNi th\u01b0\u1eddng cho th\u1ea5y kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu v\u01b0\u1ee3t tr\u1ed9i, duy tr\u00ec \u0111\u1eb7c t\u00ednh t\u1eeb l\u00e2u h\u01a1n d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n kh\u1eafc nghi\u1ec7t. Trong khi \u0111\u00f3, l\u1edbp ph\u1ee7 epoxy c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u1ef1ng th\u1eddi gian ph\u01a1i nhi\u1ec5m l\u00e2u h\u01a1n nh\u01b0ng y\u00eau c\u1ea7u \u1ee9ng d\u1ee5ng \u0111\u1ed3ng \u0111\u1ec1u \u0111\u1ec3 tr\u00e1nh \u0111i\u1ec3m y\u1ebfu.<\/p>\n<p>\u0110\u1ed9 d\u00e0y l\u1edbp ph\u1ee7 v\u00e0 s\u1ef1 hi\u1ec7n di\u1ec7n c\u1ee7a <strong>l\u1ed7 kim<\/strong> ho\u1eb7c c\u00e1c l\u1ed7i vi m\u00f4 l\u00e0 c\u00e1c y\u1ebfu t\u1ed1 quan tr\u1ecdng. L\u1edbp ph\u1ee7 m\u1ecfng h\u01a1n ho\u1eb7c l\u1ed7 kim cho ph\u00e9p \u0111\u1ed9 \u1ea9m th\u1ea5m v\u00e0o, d\u1eabn \u0111\u1ebfn \u0103n m\u00f2n c\u1ee5c b\u1ed9 c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t t\u1eeb. \u0110\u1ea3m b\u1ea3o l\u1edbp ph\u1ee7 \u0111\u1ec1u, kh\u00f4ng c\u00f3 l\u1ed7i l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 duy tr\u00ec s\u1ef1 \u1ed5n \u0111\u1ecbnh l\u00e2u d\u00e0i.<\/p>\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 \u0111\u1ed9 \u1ea9m cao ho\u1eb7c kh\u00ed quy\u1ec3n \u0103n m\u00f2n, vi\u1ec7c ch\u1ecdn l\u1edbp ph\u1ee7 ph\u00f9 h\u1ee3p v\u00e0 ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 b\u1ea3o v\u1ec7 s\u1ee9c m\u1ea1nh v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a nam ch\u00e2m. N\u1ebfu b\u1ea1n mu\u1ed1n kh\u00e1m ph\u00e1 c\u00e1ch c\u00e1c h\u00ecnh d\u1ea1ng v\u00e0 ho\u00e0n thi\u1ec7n kh\u00e1c nhau \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn vi\u1ec7c b\u1ea3o v\u1ec7 nam ch\u00e2m, h\u00e3y xem h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 <a href=\"https:\/\/nbaem.com\/vi\/rectangular-neodymium-magnets\/\">nam ch\u00e2m neodymium h\u00ecnh ch\u1eef nh\u1eadt<\/a> \u0111\u1ec3 c\u00f3 th\u00eam nh\u1eefng hi\u1ec3u bi\u1ebft s\u00e2u h\u01a1n.<\/p>\n<h2>Thu\u1ed9c t\u00ednh c\u01a1 h\u1ecdc v\u00e0 \u0111\u1ed9 gi\u00f2n<\/h2>\n<p>Nam ch\u00e2m, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c lo\u1ea1i hi\u1ebfm nh\u01b0 NdFeB, n\u1ed5i ti\u1ebfng v\u1ec1 \u0111\u1ed9 gi\u00f2n, \u0111i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc v\u00e0 c\u00e1ch x\u1eed l\u00fd trong qu\u00e1 tr\u00ecnh gia c\u00f4ng. Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa s\u1ee9c ch\u1ecbu n\u00e9n v\u00e0 s\u1ee9c ch\u1ecbu k\u00e9o l\u00e0 \u0111i\u1ec1u then ch\u1ed1t: nam ch\u00e2m th\u01b0\u1eddng cho th\u1ea5y s\u1ee9c ch\u1ecbu n\u00e9n cao h\u01a1n nhi\u1ec1u nh\u01b0ng y\u1ebfu d\u01b0\u1edbi l\u1ef1c k\u00e9o. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ch\u00fang c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c \u00e1p l\u1ef1c kh\u00e1 t\u1ed1t nh\u01b0ng d\u1ec5 b\u1ecb n\u1ee9t ho\u1eb7c v\u1ee1 v\u1ee5n khi k\u00e9o c\u0103ng ho\u1eb7c u\u1ed1n cong.<\/p>\n<p>Khi gia c\u00f4ng nam ch\u00e2m qua c\u1eaft, m\u00e0i ho\u1eb7c EDM d\u00e2y, \u0111\u1ed9 gi\u00f2n \u0111\u1eb7t ra m\u1ed9t th\u00e1ch th\u1ee9c th\u1ef1c s\u1ef1. Vi\u1ec7c x\u1eed l\u00fd ho\u1eb7c d\u1ee5ng c\u1ee5 kh\u00f4ng ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 g\u00e2y ra c\u00e1c v\u1ebft n\u1ee9t, v\u1ebft n\u1ee9t vi m\u00f4 ho\u1eb7c m\u1ea3nh v\u1ee1 b\u1ec1 m\u1eb7t, l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a nam ch\u00e2m. S\u1eed d\u1ee5ng quy tr\u00ecnh gia c\u00f4ng nh\u1eb9 nh\u00e0ng, ki\u1ec3m so\u00e1t v\u00e0 d\u1ee5ng c\u1ee5 s\u1eafc n\u00e9t gi\u00fap gi\u1ea3m thi\u1ec3u \u00e1p l\u1ef1c c\u01a1 h\u1ecdc l\u00ean nam ch\u00e2m trong qu\u00e1 tr\u00ecnh \u0111\u1ecbnh h\u00ecnh ho\u1eb7c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc.<\/p>\n<p>Trong qu\u00e1 tr\u00ecnh l\u1eafp r\u00e1p, th\u1eadm ch\u00ed nh\u1eefng va ch\u1ea1m nh\u1eb9 ho\u1eb7c \u00e1p l\u1ef1c kh\u00f4ng ph\u00f9 h\u1ee3p c\u0169ng l\u00e0m t\u0103ng nguy c\u01a1 n\u1ee9t v\u1ee1. Vi\u1ec7c x\u1eed l\u00fd nam ch\u00e2m c\u1ea9n th\u1eadn v\u00e0 tr\u00e1nh c\u00e1c l\u1ef1c s\u1ed1c \u0111\u1ed9t ng\u1ed9t ho\u1eb7c u\u1ed1n cong l\u00e0 r\u1ea5t quan tr\u1ecdng. Vi\u1ec7c c\u1ed1 \u0111\u1ecbnh \u0111\u00fang c\u00e1ch v\u00e0 \u0111\u1ec7m trong qu\u00e1 tr\u00ecnh l\u1eafp \u0111\u1eb7t c\u00f3 th\u1ec3 ng\u0103n ng\u1eeba h\u01b0 h\u1ecfng kh\u00f4ng lu\u00f4n th\u1ea5y r\u00f5 nh\u01b0ng c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1eb7c t\u00ednh t\u1eeb l\u00e2u d\u00e0i.<\/p>\n<p>T\u00f3m l\u1ea1i, \u0111\u1ed9 gi\u00f2n v\u1ed1n c\u00f3 c\u1ee7a nam ch\u00e2m \u0111\u00f2i h\u1ecfi ph\u1ea3i ch\u00fa \u00fd \u0111\u1ebfn \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc v\u00e0 ph\u01b0\u01a1ng ph\u00e1p gia c\u00f4ng c\u1ea9n th\u1eadn \u0111\u1ec3 duy tr\u00ec hi\u1ec7u su\u1ea5t v\u00e0 t\u00ednh to\u00e0n v\u1eb9n c\u1ea5u tr\u00fac c\u1ee7a ch\u00fang. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t \u0111\u00fang v\u1edbi c\u00e1c nam ch\u00e2m hi\u1ec7u su\u1ea5t cao, n\u01a1i m\u00e0 ngay c\u1ea3 t\u1ed5n th\u01b0\u01a1ng b\u1ec1 m\u1eb7t nh\u1ecf c\u0169ng c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn m\u1ea5t t\u1eeb ho\u1eb7c h\u1ecfng s\u1edbm.<\/p>\n<h2>L\u00e3o h\u00f3a v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh l\u00e2u d\u00e0i<\/h2>\n<p>Nam ch\u00e2m v\u0129nh c\u1eedu kh\u00f4ng ch\u1ec9 \u0111\u01b0\u1ee3c ki\u1ec3m tra khi m\u1edbi s\u1ea3n xu\u1ea5t\u2014ch\u00fang c\u00f2n thay \u0111\u1ed5i theo th\u1eddi gian do l\u00e3o h\u00f3a t\u1eeb. Hi\u1ec7n t\u01b0\u1ee3ng t\u1ef1 nhi\u00ean n\u00e0y g\u00e2y ra s\u1ef1 gi\u1ea3m ch\u1eadm c\u00e1c \u0111\u1eb7c t\u00ednh ch\u00ednh nh\u01b0 t\u1eeb d\u01b0 (Br) v\u00e0 \u0111\u1ed9 c\u1ee9ng t\u1eeb (Hc), ch\u1ee7 y\u1ebfu do s\u1ef1 th\u01b0 gi\u00e3n c\u1ea5u tr\u00fac b\u00ean trong. Sau nhi\u1ec1u n\u0103m s\u1eed d\u1ee5ng, nh\u1eefng d\u1ecbch chuy\u1ec3n nh\u1ecf trong c\u1ea5u tr\u00fac vi m\u00f4 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t t\u1eeb, \u0111\u1eb7c bi\u1ec7t khi ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec7t \u0111\u1ed9 ho\u1eb7c \u00e1p l\u1ef1c bi\u1ebfn \u0111\u1ed9ng.<\/p>\n<p>S\u1ef1 th\u01b0 gi\u00e3n c\u1ea5u tr\u00fac c\u00f3 ngh\u0129a l\u00e0 c\u00e1c h\u1ea1t c\u1ee7a nam ch\u00e2m \u1ed5n \u0111\u1ecbnh v\u00e0o m\u1ed9t tr\u1ea1ng th\u00e1i \u1ed5n \u0111\u1ecbnh h\u01a1n nh\u01b0ng \u00edt ho\u1ea1t \u0111\u1ed9ng t\u1eeb h\u01a1n. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y di\u1ec5n ra t\u1eeb t\u1eeb nh\u01b0ng c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn m\u1ea5t m\u00e1t r\u00f5 r\u1ec7t v\u1ec1 \u0111\u1ed9 m\u1ea1nh n\u1ebfu nam ch\u00e2m kh\u00f4ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh l\u00e2u d\u00e0i.<\/p>\n<p>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady, c\u00e1c ti\u00eau chu\u1ea9n ng\u00e0nh nh\u01b0 <strong>IEC 60404-8-1<\/strong> quy \u0111\u1ecbnh c\u00e1c th\u1eed nghi\u1ec7m l\u00e3o h\u00f3a t\u1eeb. C\u00e1c chu k\u1ef3 l\u00e3o h\u00f3a t\u0103ng t\u1ed1c n\u00e0y th\u01b0\u1eddng \u1edf nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 \u0111\u1ed9 \u1ea9m, nh\u1eb1m d\u1ef1 \u0111o\u00e1n c\u00e1ch nam ch\u00e2m ho\u1ea1t \u0111\u1ed9ng theo th\u1eddi gian trong m\u00f4i tr\u01b0\u1eddng th\u1ef1c t\u1ebf. Vi\u1ec7c ch\u1ecdn nam ch\u00e2m \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn theo c\u00e1c ti\u00eau chu\u1ea9n n\u00e0y gi\u00fap tr\u00e1nh c\u00e1c h\u1ecfng h\u00f3c b\u1ea5t ng\u1edd trong c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 \u0111\u1ed9ng c\u01a1, c\u1ea3m bi\u1ebfn ho\u1eb7c thi\u1ebft b\u1ecb y t\u1ebf.<\/p>\n<p>Hi\u1ec3u r\u00f5 qu\u00e1 tr\u00ecnh l\u00e3o h\u00f3a n\u00e0y l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 ch\u1ecdn lo\u1ea1i nam ch\u00e2m ph\u00f9 h\u1ee3p, \u0111\u1ea3m b\u1ea3o thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n duy tr\u00ec hi\u1ec7u su\u1ea5t t\u1ed1i \u01b0u trong nhi\u1ec1u n\u0103m. \u0110\u1ec3 c\u00f3 c\u00e1i nh\u00ecn s\u00e2u h\u01a1n v\u1ec1 \u0111o l\u01b0\u1eddng s\u1ee9c m\u1ea1nh nam ch\u00e2m v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 b\u1ec1n c\u1ee7a nam ch\u00e2m, c\u00e1c t\u00e0i nguy\u00ean nh\u01b0 <a href=\"https:\/\/nbaem.com\/vi\/how-to-measure-magnet-strength\/\" target=\"_blank\" rel=\"noopener\">c\u00e1ch \u0111o \u0111\u1ed9 m\u1ea1nh c\u1ee7a nam ch\u00e2m<\/a> c\u00f3 th\u1ec3 r\u1ea5t h\u1eefu \u00edch.<\/p>\n<h2>C\u00e1ch ch\u1ecdn c\u1ea5p nam ch\u00e2m ph\u00f9 h\u1ee3p cho \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n<\/h2>\n<p>Vi\u1ec7c ch\u1ecdn c\u1ea5p nam ch\u00e2m ph\u00f9 h\u1ee3p ph\u1ee5 thu\u1ed9c v\u00e0o n\u01a1i v\u00e0 c\u00e1ch b\u1ea1n d\u1ef1 \u0111\u1ecbnh s\u1eed d\u1ee5ng n\u00f3. C\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau y\u00eau c\u1ea7u c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb tr\u01b0\u1eddng c\u1ee5 th\u1ec3, kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 v\u1ec1 chi ph\u00ed. \u0110\u1ec3 \u0111\u01b0a ra l\u1ef1a ch\u1ecdn t\u1ed1t nh\u1ea5t, h\u00e3y ph\u00f9 h\u1ee3p h\u1ed3 s\u01a1 hi\u1ec7u su\u1ea5t c\u1ee7a nam ch\u00e2m v\u1edbi y\u00eau c\u1ea7u c\u1ee7a thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n.<\/p>\n<h3>Ma tr\u1eadn \u1ee8ng d\u1ee5ng<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u1ee8ng d\u1ee5ng<\/th>\n<th>C\u1ea5p nam ch\u00e2m \u0111\u1ec1 xu\u1ea5t<\/th>\n<th>Y\u00eau c\u1ea7u ch\u00ednh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u0110\u1ed9ng c\u01a1 (\u00f4 t\u00f4, c\u00f4ng nghi\u1ec7p)<\/strong><\/td>\n<td>N35 \u0111\u1ebfn N52 NdFeB (c\u1ea5p N \u0111\u1ebfn EH)<\/td>\n<td>S\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng cao (BHmax), \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t t\u1ed1t, \u0111\u1ed9 c\u1ee9ng t\u1eeb m\u1ea1nh (Hci)<\/td>\n<\/tr>\n<tr>\n<td><strong>C\u1ea3m bi\u1ebfn &amp; thi\u1ebft b\u1ecb nh\u1ecf<\/strong><\/td>\n<td>N35 \u0111\u1ebfn N45 NdFeB, nam ch\u00e2m li\u00ean k\u1ebft<\/td>\n<td>\u0110\u1ed9 m\u1ea1nh v\u1eeba ph\u1ea3i, k\u00edch th\u01b0\u1edbc nh\u1ecf g\u1ecdn, ti\u1ebft ki\u1ec7m chi ph\u00ed<\/td>\n<\/tr>\n<tr>\n<td><strong>Tuabin gi\u00f3<\/strong><\/td>\n<td>SmCo, NdFeB c\u1ea5p cao (H \u0111\u1ebfn EH)<\/td>\n<td>\u1ed4n \u0111\u1ecbnh nhi\u1ec7t v\u00e0 ch\u1ed1ng \u0103n m\u00f2n xu\u1ea5t s\u1eafc, \u0111\u1ed9 c\u1ee9ng t\u1eeb cao<\/td>\n<\/tr>\n<tr>\n<td><strong>m\u00e1y MRI<\/strong><\/td>\n<td>SmCo v\u00e0 AlNiCo<\/td>\n<td>Tr\u01b0\u1eddng t\u1eeb \u1ed5n \u0111\u1ecbnh, ch\u1ecbu nhi\u1ec7t cao, \u00edt l\u00e3o h\u00f3a<\/td>\n<\/tr>\n<tr>\n<td><strong>Thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed ti\u00eau d\u00f9ng<\/strong><\/td>\n<td>N35 \u0111\u1ebfn N42 NdFeB<\/td>\n<td>Hi\u1ec7u su\u1ea5t c\u00e2n \u0111\u1ed1i v\u00e0 chi ph\u00ed h\u1ee3p l\u00fd, k\u00edch th\u01b0\u1edbc nh\u1ecf g\u1ecdn<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Th\u01b0\u01a1ng l\u01b0\u1ee3ng gi\u1eefa chi ph\u00ed v\u00e0 hi\u1ec7u n\u0103ng (Xu h\u01b0\u1edbng gi\u00e1 n\u0103m 2025)<\/h3>\n<table>\n<thead>\n<tr>\n<th>C\u1ea5p \u0111\u1ed9 nam ch\u00e2m<\/th>\n<th>Kho\u1ea3ng gi\u00e1 \u0111i\u1ec3n h\u00ecnh (USD\/kg)<\/th>\n<th>\u0110i\u1ec3m n\u1ed5i b\u1eadt v\u1ec1 hi\u1ec7u su\u1ea5t<\/th>\n<th>C\u00e1c Tr\u01b0\u1eddng H\u1ee3p S\u1eed D\u1ee5ng T\u1ed1t Nh\u1ea5t<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>N35 \u2013 N42 NdFeB<\/strong><\/td>\n<td>$40 &#8211; $60<\/td>\n<td>N\u0103ng l\u01b0\u1ee3ng t\u1ed1t, kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u01a1 b\u1ea3n<\/td>\n<td>\u0110i\u1ec7n t\u1eed ti\u00eau d\u00f9ng, c\u1ea3m bi\u1ebfn<\/td>\n<\/tr>\n<tr>\n<td><strong>N45 \u2013 N52 NdFeB<\/strong><\/td>\n<td>$60 &#8211; $85<\/td>\n<td>N\u0103ng l\u01b0\u1ee3ng cao h\u01a1n, \u0111\u1ed9 c\u1ee9ng v\u1eefng c\u1ea3i thi\u1ec7n<\/td>\n<td>\u0110\u1ed9ng c\u01a1, b\u1ed9 truy\u1ec1n \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td><strong>SmCo (v\u00ed d\u1ee5, SmCo 2:17)<\/strong><\/td>\n<td>$150 &#8211; $220<\/td>\n<td>\u1ed4n \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9 cao, ch\u1ed1ng \u0103n m\u00f2n<\/td>\n<td>H\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, turbine gi\u00f3<\/td>\n<\/tr>\n<tr>\n<td><strong>AlNiCo<\/strong><\/td>\n<td>$30 &#8211; $45<\/td>\n<td>\u1ed4n \u0111\u1ecbnh \u1edf nhi\u1ec7t \u0111\u1ed9 cao, BHmax th\u1ea5p h\u01a1n<\/td>\n<td>Thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng, c\u1ea3m bi\u1ebfn<\/td>\n<\/tr>\n<tr>\n<td><strong>NdFeB li\u00ean k\u1ebft<\/strong><\/td>\n<td>$35 &#8211; $50<\/td>\n<td>\u0110\u1ed9 c\u1ee9ng th\u1ea5p h\u01a1n, h\u00ecnh d\u1ea1ng linh ho\u1ea1t<\/td>\n<td>\u1ee8ng d\u1ee5ng nh\u1ecf g\u1ecdn<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>L\u1eddi khuy\u00ean ch\u1ecdn lo\u1ea1i nam ch\u00e2m ph\u00f9 h\u1ee3p<\/h3>\n<ul>\n<li><strong>Xem x\u00e9t nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng:<\/strong> C\u00e1c lo\u1ea1i cao h\u01a1n nh\u01b0 H, SH, UH, v\u00e0 EH ch\u1ecbu nhi\u1ec7t cao h\u01a1n v\u1edbi t\u1ed5n th\u1ea5t kh\u00f4ng th\u1ec3 ph\u1ee5c h\u1ed3i \u00edt h\u01a1n.<\/li>\n<li><strong>C\u00e2n nh\u1eafc r\u1ee7i ro m\u1ea5t t\u1eeb t\u00ednh:<\/strong> S\u1eed d\u1ee5ng c\u00e1c lo\u1ea1i c\u00f3 \u0111\u1ed9 c\u1ee9ng v\u1eefng cao h\u01a1n (Hci) cho m\u00f4i tr\u01b0\u1eddng m\u1ea5t t\u1eeb t\u00ednh cao.<\/li>\n<li><strong>Ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u c\u01a1 h\u1ecdc:<\/strong> N\u1ebfu l\u1eafp r\u00e1p li\u00ean quan \u0111\u1ebfn gia c\u00f4ng ho\u1eb7c va \u0111\u1eadp, ch\u1ecdn lo\u1ea1i c\u00f3 \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc t\u1ed1t h\u01a1n.<\/li>\n<li><strong>Ng\u00e2n s\u00e1ch ph\u00f9 h\u1ee3p:<\/strong> \u0110\u1eebng chi qu\u00e1 m\u1ee9c cho \u0111i\u1ec3m s\u1ed1 si\u00eau cao n\u1ebfu \u0111\u01a1n xin c\u1ee7a b\u1ea1n kh\u00f4ng y\u00eau c\u1ea7u.<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch \u0111\u00e1nh gi\u00e1 c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y c\u00f9ng v\u1edbi ma tr\u1eadn \u1ee9ng d\u1ee5ng, b\u1ea1n c\u00f3 th\u1ec3 t\u1ef1 tin ch\u1ecdn lo\u1ea1i nam ch\u00e2m ph\u00f9 h\u1ee3p mang l\u1ea1i s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa t\u00ednh ch\u1ea5t t\u1eeb, \u0111\u1ed9 b\u1ec1n v\u00e0 chi ph\u00ed. \u0110\u1ec3 t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u t\u1eeb v\u00e0 c\u1ea5p \u0111\u1ed9 c\u1ee7a ch\u00fang, h\u00e3y xem c\u00e1c t\u00e0i nguy\u00ean chi ti\u1ebft v\u1ec1 <a href=\"https:\/\/nbaem.com\/vi\/magnetic-technologies\/\" target=\"_blank\" rel=\"noopener\">c\u00f4ng ngh\u1ec7 t\u1eeb t\u00ednh<\/a>.<\/p>\n<h2>Nh\u1eefng Sai L\u1ea7m Ph\u1ed5 Bi\u1ebfn G\u00e2y H\u1ecfng Hi\u1ec7u Su\u1ea5t Nam Ch\u00e2m<\/h2>\n<p>Nhi\u1ec1u y\u1ebfu t\u1ed1 c\u00f3 th\u1ec3 v\u00f4 t\u00ecnh l\u00e0m h\u1ecfng nam ch\u00e2m v\u00e0 gi\u1ea3m hi\u1ec7u qu\u1ea3 c\u1ee7a ch\u00fang. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n ch\u00fa \u00fd:<\/p>\n<ul>\n<li><strong>Ho\u1ea1t \u0111\u1ed9ng qu\u00e1 nhi\u1ec7t<\/strong>: V\u01b0\u1ee3t qu\u00e1 nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a (MOT) c\u00f3 th\u1ec3 g\u00e2y m\u1ea5t t\u1eeb t\u00ednh v\u0129nh vi\u1ec5n, \u0111\u1eb7c bi\u1ec7t \u1edf nam ch\u00e2m NdFeB. V\u1eadn h\u00e0nh nam ch\u00e2m tr\u00ean gi\u1edbi h\u1ea1n nhi\u1ec7t c\u1ee7a ch\u00fang d\u1eabn \u0111\u1ebfn gi\u1ea3m v\u0129nh vi\u1ec5n \u0111\u1ed9 t\u1eeb d\u01b0 (Br) v\u00e0 \u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb (Hc). Lu\u00f4n ki\u1ec3m tra x\u1ebfp h\u1ea1ng nhi\u1ec7t c\u1ee7a nam ch\u00e2m v\u00e0 xem x\u00e9t nhi\u1ec7t \u0111\u1ed9 Curie \u0111\u1ec3 tr\u00e1nh gi\u1ea3m hi\u1ec7u su\u1ea5t. \u0110\u1ec3 bi\u1ebft chi ti\u1ebft v\u1ec1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9, xem h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 <a href=\"https:\/\/nbaem.com\/vi\/maximum-operating-temperature-vs-curie-temperature\/\" target=\"_blank\" rel=\"noopener\">nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a so v\u1edbi nhi\u1ec7t \u0111\u1ed9 Curie<\/a>.<\/li>\n<li><strong>L\u1edbp ph\u1ee7 kh\u00f4ng ph\u00f9 h\u1ee3p cho m\u00f4i tr\u01b0\u1eddng \u1ea9m \u01b0\u1edbt<\/strong>: S\u1eed d\u1ee5ng l\u1edbp ph\u1ee7 b\u1ec1 m\u1eb7t kh\u00f4ng ph\u00f9 h\u1ee3p trong \u0111i\u1ec1u ki\u1ec7n \u0103n m\u00f2n ho\u1eb7c \u1ea9m \u01b0\u1edbt d\u1ec5 d\u1eabn \u0111\u1ebfn r\u1ec9 s\u00e9t v\u00e0 \u0103n m\u00f2n. C\u00e1c l\u1edbp ph\u1ee7 nh\u01b0 NiCuNi ho\u1eb7c Zn cung c\u1ea5p kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t, nh\u01b0ng l\u1edbp ph\u1ee7 m\u1ecfng ho\u1eb7c ch\u1ea5t l\u01b0\u1ee3ng k\u00e9m v\u1edbi l\u1ed7 nh\u1ecf d\u1ec5 l\u00e0m nam ch\u00e2m d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng. L\u1edbp epoxy v\u00e0 l\u1edbp ph\u1ee7 b\u1ea3o v\u1ec7 c\u0169ng gi\u00fap \u00edch nh\u01b0ng c\u1ea7n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng c\u1ea9n th\u1eadn. Ch\u1ecdn l\u1edbp ph\u1ee7 ph\u00f9 h\u1ee3p \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n l\u00e2u d\u00e0i c\u1ee7a nam ch\u00e2m.<\/li>\n<li><strong>Hci kh\u00f4ng \u0111\u1ee7 trong c\u00e1c \u1ee9ng d\u1ee5ng ch\u1ed1ng m\u1ea5t t\u1eeb cao<\/strong>: Nam ch\u00e2m v\u0129nh c\u1eedu c\u1ea7n c\u00f3 bi\u00ean \u0111\u1ed9 \u0111\u1ed9 c\u01b0\u1ee1ng t\u1eeb n\u1ed9i t\u1ea1i (Hci) ph\u00f9 h\u1ee3p \u0111\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c tr\u01b0\u1eddng ch\u1ed1ng t\u1eeb trong \u0111\u1ed9ng c\u01a1 v\u00e0 b\u1ed9 truy\u1ec1n \u0111\u1ed9ng. Hci qu\u00e1 nh\u1ecf d\u1eabn \u0111\u1ebfn m\u1ea5t t\u1eeb nhanh ch\u00f3ng v\u00e0 th\u1ea5t b\u1ea1i. Lu\u00f4n ch\u1ecdn lo\u1ea1i nam ch\u00e2m ph\u00f9 h\u1ee3p v\u1edbi t\u1ea3i t\u1eeb v\u00e0 c\u00f3 bi\u00ean \u0111\u1ed9 an to\u00e0n so v\u1edbi \u0111i\u1ec3m g\u00e3y tr\u00ean \u0111\u01b0\u1eddng cong m\u1ea5t t\u1eeb. Hi\u1ec3u r\u00f5 \u0111i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t nam ch\u00e2m \u0111\u00e1ng tin c\u1eady trong c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00f2i h\u1ecfi cao.<\/li>\n<\/ul>\n<p>Tr\u00e1nh nh\u1eefng sai l\u1ea7m n\u00e0y gi\u00fap b\u1ea1n duy tr\u00ec t\u00ednh ch\u1ea5t t\u1eeb v\u00e0 \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc c\u1ee7a nam ch\u00e2m, \u0111\u1ea3m b\u1ea3o tu\u1ed5i th\u1ecd l\u00e2u d\u00e0i v\u00e0 ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh trong c\u00e1c d\u1ef1 \u00e1n ho\u1eb7c s\u1ea3n ph\u1ea9m c\u1ee7a b\u1ea1n.<\/p>","protected":false},"excerpt":{"rendered":"<p>Kh\u00e1m ph\u00e1 c\u00e1c y\u1ebfu t\u1ed1 ch\u00ednh \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1eb7c t\u00ednh c\u1ee7a nam ch\u00e2m bao g\u1ed3m v\u1eadt li\u1ec7u, nhi\u1ec7t \u0111\u1ed9, kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 quy tr\u00ecnh s\u1ea3n xu\u1ea5t \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t t\u1ed1i \u01b0u.<\/p>","protected":false},"author":1,"featured_media":3393,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3394","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/what_factors_affect_the_properties_of_magnet_AgeRu.webp","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3394","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/comments?post=3394"}],"version-history":[{"count":3,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3394\/revisions"}],"predecessor-version":[{"id":3430,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3394\/revisions\/3430"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/3393"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=3394"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=3394"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=3394"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}