{"id":1451,"date":"2025-01-08T02:15:37","date_gmt":"2025-01-08T02:15:37","guid":{"rendered":"https:\/\/nbaem.com\/?p=1451"},"modified":"2025-01-08T02:17:36","modified_gmt":"2025-01-08T02:17:36","slug":"high-temperature-magnets","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/high-temperature-magnets\/","title":{"rendered":"Nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao"},"content":{"rendered":"

Nam ch\u00e2m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p t\u1eeb s\u1ea3n xu\u1ea5t \u0111\u1ebfn k\u1ef9 thu\u1eadt v\u00e0 th\u01b0\u1eddng y\u00eau c\u1ea7u ho\u1ea1t \u0111\u1ed9ng trong \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 c\u1ef1c cao. Vi\u1ec7c ch\u1ecdn \u0111\u00fang lo\u1ea1i nam ch\u00e2m cho c\u00e1c \u1ee9ng d\u1ee5ng nhi\u1ec7t \u0111\u1ed9 cao l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n t\u1ed1t nh\u1ea5t. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd xem x\u00e9t c\u00e1ch nhi\u1ec7t \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn nam ch\u00e2m v\u00e0 \u0111i qua c\u00e1c lo\u1ea1i nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao ch\u00ednh, \u0111\u1eb7c t\u00ednh c\u1ee7a ch\u00fang v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh.<\/p>\n

 <\/p>\n

Nhi\u1ec7t \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn Hi\u1ec7u su\u1ea5t c\u1ee7a Nam ch\u00e2m nh\u01b0 th\u1ebf n\u00e0o<\/span><\/h2>\n

Tr\u01b0\u1edbc khi \u0111i v\u00e0o c\u00e1c lo\u1ea1i nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao, h\u00e3y n\u00f3i v\u1ec1 c\u00e1ch nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb. N\u00f3i chung, nhi\u1ec7t l\u00e0m gi\u1ea3m \u0111\u1ed9 m\u1ea1nh c\u1ee7a nam ch\u00e2m, c\u00f2n l\u1ea1nh th\u00ec t\u0103ng c\u01b0\u1eddng t\u1eeb t\u00ednh c\u1ee7a n\u00f3. M\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 cao c\u00f3 th\u1ec3 khi\u1ebfn nam ch\u00e2m m\u1ea5t m\u1ed9t ph\u1ea7n t\u1eeb t\u00ednh c\u1ee7a n\u00f3 v\u0129nh vi\u1ec5n, t\u00f9y thu\u1ed9c v\u00e0o m\u1ee9c \u0111\u1ed9 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n ho\u1ea1t \u0111\u1ed9ng c\u1ee7a nam ch\u00e2m.<\/p>\n

1) Nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a so v\u1edbi Nhi\u1ec7t \u0111\u1ed9 Curie:<\/strong><\/p>\n

M\u1ed7i lo\u1ea1i nam ch\u00e2m c\u00f3 nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a n\u01a1i n\u00f3 b\u1eaft \u0111\u1ea7u m\u1ea5t c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb c\u1ee7a m\u00ecnh. Khi v\u01b0\u1ee3t qu\u00e1 nhi\u1ec7t \u0111\u1ed9 n\u00e0y, b\u1ea1n s\u1ebd g\u1eb7p ph\u1ea3i m\u1ea5t t\u1eeb t\u00ednh kh\u00f4ng th\u1ec3 ph\u1ee5c h\u1ed3i. Nhi\u1ec7t \u0111\u1ed9 Curie l\u00e0 \u0111i\u1ec3m m\u00e0 nam ch\u00e2m m\u1ea5t ho\u00e0n to\u00e0n t\u1eeb t\u00ednh. C\u1ea3 hai nhi\u1ec7t \u0111\u1ed9 n\u00e0y \u0111\u1ec1u kh\u00e1c nhau \u0111\u1ed1i v\u1edbi c\u00e1c lo\u1ea1i v\u00e0 c\u1ea5p \u0111\u1ed9 nam ch\u00e2m kh\u00e1c nhau.<\/p>\n

2) M\u1ea5t t\u1eeb t\u00ednh c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i so v\u1edbi m\u1ea5t t\u1eeb t\u00ednh v\u0129nh vi\u1ec5n:<\/strong><\/p>\n

N\u1ebfu b\u1ea1n nung n\u00f3ng nam ch\u00e2m v\u01b0\u1ee3t qu\u00e1 nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a c\u1ee7a n\u00f3 nh\u01b0ng ch\u01b0a \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 Curie, n\u00f3 c\u00f3 th\u1ec3 tr\u1ea3i qua m\u1ea5t t\u1eeb t\u00ednh c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 \u0111\u1ed9 m\u1ea1nh c\u1ee7a nam ch\u00e2m c\u00f3 th\u1ec3 tr\u1edf l\u1ea1i khi n\u00f3 ngu\u1ed9i \u0111i. Tuy nhi\u00ean, n\u1ebfu b\u1ea1n ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec7t \u0111\u1ed9 c\u1ef1c cao trong th\u1eddi gian d\u00e0i ho\u1eb7c \u0111\u01b0a n\u00f3 \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 Curie, b\u1ea1n s\u1ebd g\u1eb7p m\u1ea5t t\u1eeb t\u00ednh v\u0129nh vi\u1ec5n. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 t\u1eeb t\u00ednh s\u1ebd kh\u00f4ng tr\u1edf l\u1ea1i.<\/p>\n

\u00a0<\/strong><\/p>\n

C\u00e1c Lo\u1ea1i Nam ch\u00e2m Ch\u1ecbu Nhi\u1ec7t Cao Ph\u1ed5 Bi\u1ebfn<\/strong><\/span><\/h2>\n

D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c lo\u1ea1i nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao ph\u1ed5 bi\u1ebfn nh\u1ea5t m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng. M\u1ed7i lo\u1ea1i c\u00f3 \u0111\u1eb7c t\u00ednh ri\u00eang bi\u1ec7t ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau.<\/p>\n

    \n
  1. Nam ch\u00e2m AlNiCo (Nh\u00f4m-Nickel-Cobalt)<\/strong><\/span><\/a><\/li>\n<\/ol>\n

    Nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a:<\/strong> L\u00ean \u0111\u1ebfn 525\u00b0C<\/p>\n

    Nhi\u1ec7t \u0111\u1ed9 Curie<\/strong>: ~850\u00b0C<\/p>\n

    Nam ch\u00e2m AlNiCo \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb h\u1ee3p kim c\u1ee7a nh\u00f4m, nickel, cobalt v\u00e0 s\u1eaft. Ch\u00fang c\u00f3 th\u1ec3 ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao nh\u1ea5t trong c\u00e1c lo\u1ea1i nam ch\u00e2m th\u01b0\u01a1ng m\u1ea1i, l\u00ean \u0111\u1ebfn 525\u00b0C. Ng\u01b0\u1eddi ta s\u1eed d\u1ee5ng ch\u00fang trong c\u1ea3m bi\u1ebfn, b\u1ed9 thu \u00e2m guitar, v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p nhi\u1ec7t \u0111\u1ed9 cao v\u00ec ch\u00fang r\u1ea5t \u1ed5n \u0111\u1ecbnh v\u1ec1 nhi\u1ec7t. M\u1eb7c d\u00f9 \u0111\u00e3 b\u1ecb thay th\u1ebf b\u1edfi c\u00e1c lo\u1ea1i nam ch\u00e2m hi\u1ebfm \u0111\u1ea5t m\u1ea1nh h\u01a1n trong nhi\u1ec1u \u1ee9ng d\u1ee5ng, ng\u01b0\u1eddi ta v\u1eabn th\u00edch s\u1eed d\u1ee5ng nam ch\u00e2m AlNiCo \u1edf nh\u1eefng n\u01a1i c\u00f3 nhi\u1ec7t \u0111\u1ed9 c\u1ef1c cao.<\/p>\n

      \n
    1. Nam ch\u00e2m Ferrite (G\u1ed1m)<\/strong><\/span><\/a><\/li>\n<\/ol>\n

      Nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a: L\u00ean \u0111\u1ebfn 250\u00b0C<\/p>\n

      Nhi\u1ec7t \u0111\u1ed9 Curie: ~450\u00b0C<\/p>\n

      Nam ch\u00e2m ferrite, c\u00f2n g\u1ecdi l\u00e0 nam ch\u00e2m g\u1ed1m, ch\u1ee7 y\u1ebfu l\u00e0m t\u1eeb oxit s\u1eaft v\u00e0 c\u00e1c nguy\u00ean t\u1ed1 kim lo\u1ea1i kh\u00e1c. M\u1eb7c d\u00f9 ch\u00fang c\u00f3 gi\u1edbi h\u1ea1n nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n c\u00e1c lo\u1ea1i nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao kh\u00e1c, nh\u01b0ng ch\u00fang r\u1ebb v\u00e0 c\u00e1ch \u0111i\u1ec7n t\u1ed1t. B\u1ea1n s\u1ebd th\u1ea5y ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong bi\u1ebfn \u00e1p v\u00e0 c\u00e1p m\u00e1y t\u00ednh v\u00ec ch\u00fang l\u00e0 gi\u1ea3i ph\u00e1p kinh t\u1ebf cho c\u00e1c \u1ee9ng d\u1ee5ng kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 250\u00b0C.<\/p>\n

        \n
      1. Nam ch\u00e2m SmCo (Samarium Cobalt)<\/strong><\/span><\/a><\/li>\n<\/ol>\n

        Nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a: 310-400\u00b0C<\/p>\n

        Nhi\u1ec7t \u0110\u1ed9 Curie: ~700\u00b0C<\/p>\n

        Nam ch\u00e2m Samarium Cobalt (SmCo) r\u1ea5t b\u1ec1n, c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb m\u1ea1nh v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t tuy\u1ec7t v\u1eddi. Nh\u1eefng nam ch\u00e2m n\u00e0y ph\u00f9 h\u1ee3p cho m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 cao, \u0111\u1eb7c bi\u1ec7t trong ng\u00e0nh h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 v\u00e0 k\u1ef9 thu\u1eadt \u00f4 t\u00f4. Ch\u00fang ch\u1ed1ng \u0103n m\u00f2n v\u00e0 oxy h\u00f3a t\u1ed1t h\u01a1n nam ch\u00e2m neodymium v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ea5t t\u1eeb tuy\u1ec7t v\u1eddi. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao b\u1ea1n th\u1ea5y ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 th\u1ea5p.\u00a0<\/strong><\/p>\n

          \n
        1. Nam ch\u00e2m NdFeB (Neodymium-Iron-Boron)<\/strong><\/span><\/a><\/li>\n<\/ol>\n

          Nhi\u1ec7t \u0110\u1ed9 Ho\u1ea1t \u0110\u1ed9ng T\u1ed1i \u0110a: 80-200\u00b0C t\u00f9y theo lo\u1ea1i<\/p>\n

          Nhi\u1ec7t \u0110\u1ed9 Curie: 310-340\u00b0C<\/p>\n

          Nam ch\u00e2m neodymium l\u00e0 lo\u1ea1i nam ch\u00e2m m\u1ea1nh nh\u1ea5t c\u00f3 s\u1eb5n tr\u00ean th\u1ecb tr\u01b0\u1eddng v\u1ec1 m\u1eb7t t\u1eeb l\u1ef1c. Tuy nhi\u00ean, kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u1ee7a ch\u00fang th\u1ea5p h\u01a1n SmCo v\u00e0 AlNiCo. Nam ch\u00e2m neodymium c\u00f3 c\u00e1c c\u1ea5p \u0111\u1ed9 kh\u00e1c nhau d\u1ef1a tr\u00ean kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t:<\/p>\n

          M (80-100\u00b0C)<\/p>\n

          H (100-120\u00b0C)<\/p>\n

          SH (120-150\u00b0C)<\/p>\n

          UH (150-180\u00b0C)<\/p>\n

          EH (180-200\u00b0C)<\/p>\n

          Trong m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 cao, nam ch\u00e2m neodymium m\u1ea5t \u0111i 0.11% t\u1eeb t\u00ednh c\u1ee7a ch\u00fang cho m\u1ed7i 1\u00b0C t\u0103ng l\u00ean. M\u1ee9c m\u1ea5t n\u00e0y th\u01b0\u1eddng c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i mi\u1ec5n l\u00e0 kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 nhi\u1ec7t \u0111\u1ed9 t\u1ed1i \u0111a.<\/p>\n

          \"Nhi\u1ec7t

          Nhi\u1ec7t \u0111\u1ed9 l\u00e0m vi\u1ec7c t\u1ed1i \u0111a c\u1ee7a nam ch\u00e2m AlNiCo, nam ch\u00e2m ferrite, nam ch\u00e2m SmCo, nam ch\u00e2m NdFeB<\/p><\/div>\n

           <\/p>\n

          C\u00e1c y\u1ebfu t\u1ed1 ch\u00ednh \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a nam ch\u00e2m \u1edf nhi\u1ec7t \u0111\u1ed9 cao<\/strong><\/span><\/h2>\n

          Ngo\u00e0i lo\u1ea1i nam ch\u00e2m, c\u00f2n c\u00f3 m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 kh\u00e1c c\u1ea7n xem x\u00e9t khi n\u00f3i \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a nam ch\u00e2m \u1edf nhi\u1ec7t \u0111\u1ed9 cao:<\/p>\n

          Nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng v\u00e0 \u0111\u1ed9 \u1ea9m:<\/strong><\/p>\n

          Nam ch\u00e2m ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 \u0111i\u1ec1u ki\u1ec7n \u1ea9m \u01b0\u1edbt c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng nhanh h\u01a1n. V\u00ed d\u1ee5, nam ch\u00e2m neodymium s\u1ebd b\u1ecb \u0103n m\u00f2n, v\u00ec v\u1eady ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c ph\u1ee7 m\u1ed9t l\u1edbp nh\u01b0 nickel ho\u1eb7c epoxy \u0111\u1ec3 b\u1ea3o v\u1ec7 trong nh\u1eefng m\u00f4i tr\u01b0\u1eddng \u0111\u00f3.<\/p>\n

          Th\u00e0nh ph\u1ea7n v\u1eadt li\u1ec7u:<\/strong><\/p>\n

          C\u00e1c lo\u1ea1i nam ch\u00e2m kh\u00e1c nhau \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb c\u00e1c ch\u1ea5t kh\u00e1c nhau v\u00e0 do \u0111\u00f3 c\u00f3 m\u1ee9c \u0111\u1ed9 ch\u1ed1ng ch\u1ecbu kh\u00e1c nhau. V\u00ed d\u1ee5, nam ch\u00e2m ferrite d\u1ef1a tr\u00ean g\u1ed1m s\u1ee9, r\u1ea5t ch\u1ecbu nhi\u1ec7t nh\u01b0ng d\u1ec5 v\u1ee1. Trong khi \u0111\u00f3, nam ch\u00e2m neodymium \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb h\u1ee3p kim kim lo\u1ea1i, v\u00ec v\u1eady c\u1ea7n \u0111\u01b0\u1ee3c ph\u1ee7 \u0111\u1ec3 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd, \u0111\u1eb7c bi\u1ec7t trong m\u00f4i tr\u01b0\u1eddng \u1ea9m \u01b0\u1edbt ho\u1eb7c d\u1ec5 \u0103n m\u00f2n.<\/p>\n

           <\/p>\n

          \u1ee8ng d\u1ee5ng nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao<\/strong><\/span><\/h2>\n

          C\u00f3 nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p y\u00eau c\u1ea7u nam ch\u00e2m c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t cao v\u00ec hi\u1ec7u su\u1ea5t c\u1ea7n duy tr\u00ec \u1ed5n \u0111\u1ecbnh khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng:<\/p>\n

          H\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5: <\/strong>C\u00e1c \u0111\u1ed9ng c\u01a1 turbine v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn kh\u00e1c s\u1eed d\u1ee5ng nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao khi nhi\u1ec7t \u0111\u1ed9 cao.<\/p>\n

          \u00d4 t\u00f4: <\/strong>\u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n, c\u1ea3m bi\u1ebfn v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn kh\u00e1c c\u1ee7a \u00f4 t\u00f4 s\u1eed d\u1ee5ng nam ch\u00e2m c\u00f3 th\u1ec3 ch\u1ecbu nhi\u1ec7t cao v\u00ec \u0111\u1ed9ng c\u01a1 v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn kh\u00e1c tr\u1edf n\u00ean n\u00f3ng.<\/p>\n

          S\u1ea3n xu\u1ea5t v\u00e0 k\u1ef9 thu\u1eadt:<\/strong> Nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p nh\u01b0 h\u00e0n ho\u1eb7c gia c\u00f4ng nhi\u1ec7t cao. Ch\u00fang gi\u1eef \u0111\u01b0\u1ee3c t\u1eeb t\u00ednh ngay c\u1ea3 khi nhi\u1ec7t \u0111\u1ed9 bi\u1ebfn \u0111\u1ed9ng.<\/p>\n

          Thi\u1ebft b\u1ecb y t\u1ebf:<\/strong> M\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb y t\u1ebf v\u00e0 d\u1ee5ng c\u1ee5 c\u1ea7n nam ch\u00e2m ho\u1ea1t \u0111\u1ed9ng \u1edf nhi\u1ec7t \u0111\u1ed9 ti\u1ec7t tr\u00f9ng, v\u1ed1n l\u00e0 nhi\u1ec7t \u0111\u1ed9 cao.<\/p>\n

           <\/p>\n

          C\u00e1ch ch\u1ecdn nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao<\/span><\/h2>\n

          Nam ch\u00e2m ch\u1ecbu nhi\u1ec7t ph\u00f9 h\u1ee3p cho \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec1u ki\u1ec7n v\u1eadn h\u00e0nh c\u1ee5 th\u1ec3. B\u1ea1n c\u1ea7n bi\u1ebft nhi\u1ec7t \u0111\u1ed9 t\u1ed1i \u0111a, th\u1eddi gian nam ch\u00e2m s\u1ebd ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec7t \u0111\u1ed9 \u0111\u00f3, v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng nh\u01b0 \u0111\u1ed9 \u1ea9m. Nam ch\u00e2m AlNiCo, ferrite, SmCo v\u00e0 NdFeB \u0111\u1ec1u c\u00f3 m\u1ee9c \u0111\u1ed9 ch\u1ecbu nhi\u1ec7t kh\u00e1c nhau. M\u1ed7i lo\u1ea1i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng th\u01b0\u01a1ng m\u1ea1i v\u00e0 c\u00f4ng nghi\u1ec7p kh\u00e1c nhau. Tr\u01b0\u1edbc khi ch\u1ecdn nam ch\u00e2m, b\u1ea1n c\u1ea7n bi\u1ebft nhi\u1ec7t \u0111\u1ed9 v\u1eadn h\u00e0nh t\u1ed1i \u0111a v\u00e0 nhi\u1ec7t \u0111\u1ed9 Curie c\u1ee7a nam ch\u00e2m.<\/p>\n

          \u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao ho\u1eb7c \u0111\u1ec3 nh\u1eadn b\u00e1o gi\u00e1 cho nhu c\u1ea7u nam ch\u00e2m c\u1ee7a b\u1ea1n, h\u00e3y truy c\u1eadp NBAEM<\/a>. Ch\u00fang t\u00f4i h\u1ee3p t\u00e1c v\u1edbi c\u00e1c c\u00f4ng ty v\u00e0 ng\u00e0nh c\u00f4ng nghi\u1ec7p tr\u00ean to\u00e0n th\u1ebf gi\u1edbi \u0111\u1ec3 cung c\u1ea5p c\u00e1c gi\u1ea3i ph\u00e1p ch\u1ea5t l\u01b0\u1ee3ng cao.<\/p>\n

           <\/p>","protected":false},"excerpt":{"rendered":"

          Nam ch\u00e2m \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p t\u1eeb s\u1ea3n xu\u1ea5t \u0111\u1ebfn k\u1ef9 thu\u1eadt v\u00e0 th\u01b0\u1eddng y\u00eau c\u1ea7u ho\u1ea1t \u0111\u1ed9ng trong \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 kh\u1eafc nghi\u1ec7t. Vi\u1ec7c ch\u1ecdn \u0111\u00fang lo\u1ea1i nam ch\u00e2m cho c\u00e1c \u1ee9ng d\u1ee5ng nhi\u1ec7t \u0111\u1ed9 cao l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n t\u1ed1i \u01b0u. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i s\u1ebd xem x\u00e9t c\u00e1ch nhi\u1ec7t \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn nam ch\u00e2m v\u00e0 tr\u00ecnh b\u00e0y c\u00e1c [\u2026]<\/p>","protected":false},"author":1,"featured_media":1453,"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-1451","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/01\/Max-working-temperature-for-different-magnets.png","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1451","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=1451"}],"version-history":[{"count":3,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1451\/revisions"}],"predecessor-version":[{"id":1455,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1451\/revisions\/1455"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/1453"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=1451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=1451"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=1451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}