{"id":3453,"date":"2025-11-26T07:11:08","date_gmt":"2025-11-26T07:11:08","guid":{"rendered":"https:\/\/nbaem.com\/?p=3453"},"modified":"2025-11-25T05:53:26","modified_gmt":"2025-11-25T05:53:26","slug":"is-cobalt-magnetic","status":"publish","type":"post","link":"https:\/\/nbaem.com\/cs\/is-cobalt-magnetic\/","title":{"rendered":"Je kobalt magnetick\u00fd? Objevte jeho pevnost, teplotu a pou\u017eit\u00ed"},"content":{"rendered":"<p><strong>Je kobalt magnetick\u00fd?<\/strong> Rozhodn\u011b\u2014<strong>kobalt<\/strong> je jeden z vz\u00e1cn\u00fdch kov\u016f, kter\u00fd je p\u0159irozen\u011b <strong>feromagnetick\u00e9<\/strong> p\u0159i pokojov\u00e9 teplot\u011b, stoj\u00ed po bok \u017eeleza a niklu. \u010c\u00edm se kobalt odli\u0161uje? Jeho <strong>teplotu Curie<\/strong> se \u0159ad\u00ed na prvn\u00ed m\u00edsto s hodnotou 1121 \u00b0C, co\u017e znamen\u00e1, \u017ee z\u016fst\u00e1v\u00e1 magnetick\u00fd mnohem d\u00e9le p\u0159i extr\u00e9mn\u00edm teple. A\u0165 u\u017e v\u00e1s zaj\u00edm\u00e1 jeho pevnost, jak se srovn\u00e1v\u00e1 s neodymov\u00fdmi magnety, nebo jeho role ve vysokoteplotn\u00edch aplikac\u00edch, tento pr\u016fvodce odstra\u0148uje \u0161um a poskytuje jasn\u00e9, odborn\u00e9 fakta, kter\u00e1 pot\u0159ebujete. Poj\u010fme se pod\u00edvat na to, pro\u010d jsou magnetick\u00e9 vlastnosti kobaltu st\u00e1le d\u016fle\u017eit\u00e9 i dnes.<\/p>\n<div id=\"attachment_3452\" style=\"width: 537px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-3452\" class=\"wp-image-3452\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r.webp\" alt=\"Je kobalt magnetick\u00fd\" width=\"527\" height=\"527\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-12x12.webp 12w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-66x66.webp 66w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-150x150.webp 150w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-200x200.webp 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-300x300.webp 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-400x400.webp 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-600x600.webp 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-768x768.webp 768w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-800x800.webp 800w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r.webp 1024w\" sizes=\"(max-width: 527px) 100vw, 527px\" \/><p id=\"caption-attachment-3452\" class=\"wp-caption-text\">Je kobalt magnetick\u00fd<\/p><\/div>\n<h2>V\u011bda: Pro\u010d je kobalt feromagnetick\u00fd<\/h2>\n<p>Ano, kobalt je magnetick\u00fd\u2014konkr\u00e9tn\u011b, je <strong>feromagnetick\u00e9<\/strong>. Ale pro\u010d? Odpov\u011b\u010f spo\u010d\u00edv\u00e1 hluboko v jeho atomov\u00e9 struktu\u0159e a magnetick\u00fdch dom\u00e9n\u00e1ch.<\/p>\n<h3>Konfigurace elektron\u016f a nep\u00e1rov\u00e9 3d elektrony<\/h3>\n<ul>\n<li>Kobalt m\u00e1 konfiguraci elektron\u016f:<br \/>\n<strong>[Ar] 3d\u2077 4s\u00b2<\/strong><\/li>\n<li>Z sedmi 3d elektron\u016f <strong>n\u011bkter\u00e9 z nich z\u016fst\u00e1vaj\u00ed nep\u00e1rov\u00e9<\/strong>.<\/li>\n<li>Tyto nep\u00e1rov\u00e9 elektrony maj\u00ed spiny, kter\u00e9 p\u016fsob\u00ed jako mal\u00e9 magnety.<\/li>\n<li>Kdy\u017e se mnoho spin\u016f zarovn\u00e1 ve stejn\u00e9m sm\u011bru, vytv\u00e1\u0159ej\u00ed <strong>siln\u00e9 celkov\u00e9 magnetick\u00e9 pole<\/strong>.<\/li>\n<\/ul>\n<h3>Magnetick\u00e9 dom\u00e9ny a spont\u00e1nn\u00ed magnetizace<\/h3>\n<ul>\n<li>Atomy kobaltu se shlukuj\u00ed do mal\u00fdch oblast\u00ed naz\u00fdvan\u00fdch <strong>magnetick\u00e9 dom\u00e9ny<\/strong>.<\/li>\n<li>Uvnit\u0159 ka\u017ed\u00e9 dom\u00e9ny se uspo\u0159\u00e1d\u00e1n\u00ed spin\u016f elektron\u016f rovnom\u011brn\u011b zarovn\u00e1.<\/li>\n<li>A\u010dkoli jsou dom\u00e9ny v ne magnetizovan\u00e9m kusu n\u00e1hodn\u011b orientovan\u00e9, kdy\u017e jsou zarovn\u00e1ny, tyto dom\u00e9ny vytv\u00e1\u0159ej\u00ed <strong>spont\u00e1nn\u00ed magnetizaci<\/strong>, kter\u00e1 d\u00e1v\u00e1 kobaltu jeho magnetickou s\u00edlu.<\/li>\n<\/ul>\n<h3>Feromagnetick\u00e9 vs Paramagnetick\u00e9 vs Diamagnetick\u00e9<\/h3>\n<table>\n<thead>\n<tr>\n<th>Vlastnost<\/th>\n<th>Feromagnetick\u00fd (Kobalt)<\/th>\n<th>Paramagnetick\u00e9<\/th>\n<th>Diamagnetick\u00e9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Zarovn\u00e1n\u00ed spin\u016f elektron\u016f<\/td>\n<td>Siln\u00e1, spont\u00e1nn\u00ed<\/td>\n<td>Slab\u00e1, pouze s polem<\/td>\n<td>Odporuje vn\u011bj\u0161\u00edmu poli<\/td>\n<\/tr>\n<tr>\n<td>Magnetick\u00e9 chov\u00e1n\u00ed<\/td>\n<td>St\u00e1l\u00e1 magnetizace<\/td>\n<td>Do\u010dasn\u00e1 magnetizace<\/td>\n<td>Velmi slab\u00e9 odpuzov\u00e1n\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Obvykl\u00e9 p\u0159\u00edklady<\/td>\n<td>Kobalt, \u017eelezo, nikl<\/td>\n<td>Hlin\u00edk, platina<\/td>\n<td>M\u011b\u010f, zlato, bismut<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Ve zkratce, kobaltov\u00e9 <strong>nepaired elektrony a struktura dom\u00e9n<\/strong> z n\u011bj \u010din\u00ed klasick\u00fd feromagnetick\u00fd prvek, kter\u00fd je schopen st\u00e1t se siln\u00fdm st\u00e1l\u00fdm magnetem p\u0159i magnetizaci.<\/p>\n<h2>Jak siln\u00fd je kobalt ve srovn\u00e1n\u00ed s jin\u00fdmi magnetick\u00fdmi materi\u00e1ly?<\/h2>\n<p>\u010cist\u00fd kobalt m\u00e1 saturaci magnetizace p\u0159ibli\u017en\u011b 1,79 Tesla (T), co\u017e znamen\u00e1, \u017ee p\u0159i \u00fapln\u00e9 magnetizaci m\u016f\u017ee generovat siln\u00e9 magnetick\u00e9 pole. Pro srovn\u00e1n\u00ed, \u017eelezo je o n\u011bco v\u00fd\u0161e s p\u0159ibli\u017en\u011b 2,15 T a nikl je ni\u017e\u0161\u00ed, asi 0,6 T. Ale \u010dist\u00e9 kovy v re\u00e1ln\u00fdch magnetech \u010dasto ne\u0159\u00edkaj\u00ed celou pravdu.<\/p>\n<p>Toto je rychl\u00fd p\u0159ehled toho, jak \u010dist\u00fd kobalt porovn\u00e1v\u00e1me s b\u011b\u017en\u00fdmi magnetick\u00fdmi materi\u00e1ly:<\/p>\n<table>\n<thead>\n<tr>\n<th>Material<\/th>\n<th>Saturation Magnetization (T)<\/th>\n<th>Typick\u00e9 pou\u017eit\u00ed<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u010cist\u00fd kobalt (Co)<\/td>\n<td>1.79<\/td>\n<td>Z\u0159\u00eddka pou\u017e\u00edv\u00e1n samostatn\u011b v magnetech<\/td>\n<\/tr>\n<tr>\n<td>\u017delezo (Fe)<\/td>\n<td>2.15<\/td>\n<td>J\u00e1drov\u00fd magnetick\u00fd materi\u00e1l<\/td>\n<\/tr>\n<tr>\n<td>Nikl (Ni)<\/td>\n<td>0.6<\/td>\n<td>Z\u00e1klad slitiny<\/td>\n<\/tr>\n<tr>\n<td>Alnico (Al-Ni-Co)<\/td>\n<td>~1.0<\/td>\n<td>St\u0159edn\u00ed s\u00edla, stabiln\u00ed teplota<\/td>\n<\/tr>\n<tr>\n<td>Samarium-Kobalt (SmCo)<\/td>\n<td>0.9 &#8211; 1.1<\/td>\n<td>Magnety s vysokou teplotou, vz\u00e1cn\u00e9 zeminy<\/td>\n<\/tr>\n<tr>\n<td>Neodym (NdFeB)<\/td>\n<td>1.2 &#8211; 1.4<\/td>\n<td>Nejsiln\u011bj\u0161\u00ed komer\u010dn\u00ed magnety<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Pokud jde o <strong>v\u00fdkon v re\u00e1ln\u00e9m sv\u011bt\u011b<\/strong>, magnety jsou hodnoceny podle v\u00edce ne\u017e jen jejich hrub\u00e9 s\u00edly. Remanence (zbytkov\u00e9 magnetismus), coercivita (odolnost v\u016f\u010di demagnetizaci) a energetick\u00fd produkt (maxim\u00e1ln\u00ed hustota energie) jsou tak\u00e9 d\u016fle\u017eit\u00e9:<\/p>\n<ul>\n<li><a href=\"https:\/\/nbaem.com\/cs\/products\/samarium-cobalt-magnets\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\"><strong>Samarium-Kobalt (SmCo)<\/strong> <\/span><\/a>magnety jsou cen\u011bny pro jejich vynikaj\u00edc\u00ed coercivitu a teplotn\u00ed stabilitu, s energetick\u00fdmi produkty a\u017e do 28 MGOe.<\/li>\n<li><a href=\"https:\/\/nbaem.com\/cs\/products\/neodymium-magnet\/\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #0000ff;\">Magn\u00e9ty neodymiov\u00e9 (NdFeB)<\/span><\/strong> <\/a>vedou v \u010dist\u00e9 s\u00edle, s energetick\u00fdmi produkty p\u0159es 50 MGOe, ale ztr\u00e1cej\u00ed v\u00fdkon p\u0159i vy\u0161\u0161\u00edch teplot\u00e1ch.<\/li>\n<li><a href=\"https:\/\/nbaem.com\/cs\/products\/alnico-magnet\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\"><strong>Magnety Alnico<\/strong><\/span><\/a>, kter\u00e9 zahrnuj\u00ed kobalt, nab\u00edzej\u00ed st\u0159edn\u00ed s\u00edlu, ale v\u00fdjime\u010dnou teplotn\u00ed stabilitu a jsou m\u00e9n\u011b k\u0159ehk\u00e9.<\/li>\n<\/ul>\n<p>A\u010dkoliv \u010dist\u00e1 magnetick\u00e1 s\u00edla kobaltu nen\u00ed rekordn\u00ed, jeho hodnota vynik\u00e1 v slitin\u00e1ch a pevn\u00fdch magnetech, zejm\u00e9na tam, kde je kl\u00ed\u010dov\u00e1 odolnost v\u016f\u010di teplot\u00e1m.<\/p>\n<p>Pokud jde o kobaltov\u00e9 magnety, na trhu najdete hlavn\u011b dva typy <strong>Samarium-kobaltov\u00e9 (SmCo) magnety<\/strong> a <strong>Alnico (Al-Ni-Co) magnety<\/strong>.<\/p>\n<h3>Samarium-kobaltov\u00e9 (SmCo) magnety<\/h3>\n<p>SmCo magnety p\u0159ich\u00e1zej\u00ed ve dvou b\u011b\u017en\u00fdch t\u0159\u00edd\u00e1ch: <strong>1:5<\/strong> a <strong>2:17<\/strong> (odkazuje na pom\u011br samaria k kobaltu v slitin\u011b). Tyto magnety jsou cen\u011bny pro jejich <strong>extr\u00e9mn\u011b vysokou odolnost v\u016f\u010di teplot\u00e1m<\/strong>, schopn\u00e9 spolehliv\u011b fungovat a\u017e kolem <strong>350 \u00b0C<\/strong>, co\u017e z nich \u010din\u00ed n\u011bkter\u00e9 z nejlep\u0161\u00edch vysokoteplotn\u00edch permanentn\u00edch magnet\u016f dostupn\u00fdch. Dob\u0159e odol\u00e1vaj\u00ed korozi, tak\u017ee nepot\u0159ebuj\u00ed dal\u0161\u00ed povlaky.<\/p>\n<p><strong>V\u00fdhody:<\/strong><\/p>\n<ul>\n<li>Vynikaj\u00edc\u00ed teplotn\u00ed stabilita<\/li>\n<li>Vysok\u00e1 odolnost v\u016f\u010di korozi<\/li>\n<li>Siln\u00fd magnetick\u00fd v\u00fdkon stabiln\u00ed p\u0159i zv\u00fd\u0161en\u00fdch teplot\u00e1ch<\/li>\n<\/ul>\n<p><strong>Nev\u00fdhody:<\/strong><\/p>\n<ul>\n<li>K\u0159ehk\u00e9 a n\u00e1chyln\u00e9 k od\u0161t\u00edpnut\u00ed nebo prasknut\u00ed p\u0159i nespr\u00e1vn\u00e9m zach\u00e1zen\u00ed<\/li>\n<li>Dra\u017e\u0161\u00ed ne\u017e jin\u00e9 magnety<\/li>\n<li>Obvykle nejsou tak siln\u00e9 jako neodymov\u00e9 (NdFeB) magnety v surov\u00e9 magnetick\u00e9 s\u00edle<\/li>\n<\/ul>\n<h3>Alnico (Al-Ni-Co) magnety<\/h3>\n<p>Alnico magnety, vyroben\u00e9 z hlin\u00edku, niklu a kobaltu, jsou na trhu ji\u017e od za\u010d\u00e1tku 20. stolet\u00ed. A\u010dkoliv nedosahuj\u00ed magnetick\u00e9 s\u00edly SmCo nebo neodymov\u00fdch magnet\u016f, Alnico magnety nab\u00edzej\u00ed <strong>st\u0159edn\u00ed s\u00edlu<\/strong> a jsou zn\u00e1m\u00e9 pro svou <strong>vynikaj\u00edc\u00ed teplotn\u00ed stabilitu<\/strong>, odol\u00e1vaj\u00ed teplu je\u0161t\u011b l\u00e9pe ne\u017e mnoho jin\u00fdch typ\u016f magnet\u016f, ne\u017e se staly popul\u00e1rn\u00edmi magnety SmCo.<\/p>\n<p><strong>Kl\u00ed\u010dov\u00e9 vlastnosti:<\/strong><\/p>\n<ul>\n<li>Dobr\u00e1 stabilita teploty (lep\u0161\u00ed ne\u017e v\u011bt\u0161ina krom\u011b SmCo)<\/li>\n<li>Odoln\u00fd a mechanicky tvrd\u0161\u00ed ne\u017e SmCo<\/li>\n<li>St\u0159edn\u00ed magnetick\u00e1 s\u00edla<\/li>\n<li>Historicky d\u016fle\u017eit\u00fd p\u0159ed t\u00edm, ne\u017e p\u0159evzaly vz\u00e1cn\u00e9 zeminov\u00e9 magnety<\/li>\n<\/ul>\n<p>Oba typy pln\u00ed d\u016fle\u017eit\u00e9 niky v z\u00e1vislosti na va\u0161ich pot\u0159eb\u00e1ch\u2014a\u0165 u\u017e jde o extr\u00e9mn\u00ed odolnost v\u016f\u010di teplu nebo vyv\u00e1\u017eenou s\u00edlu s odolnost\u00ed. Pokud hled\u00e1te magnety s v\u00fdjime\u010dnou odolnost\u00ed v\u016f\u010di teplu, samarium-kobalt je obvykle volbou \u010d\u00edslo jedna, zejm\u00e9na v letectv\u00ed nebo specializovan\u00e9m pr\u016fmyslov\u00e9m pou\u017eit\u00ed.<\/p>\n<p>Pro ty, kte\u0159\u00ed cht\u011bj\u00ed mo\u017enost s pevnou v\u00fdkonnost\u00ed a men\u0161\u00ed k\u0159ehkost\u00ed, jsou magnety Alnico st\u00e1le relevantn\u00ed i p\u0159es nov\u011bj\u0161\u00ed technologie.<\/p>\n<p>Pokud zkoum\u00e1te cobaltov\u00e9 magnety pro pr\u016fmyslov\u00e9 nebo zelen\u00e9 energetick\u00e9 vyu\u017eit\u00ed, stoj\u00ed za to porovnat tyto mo\u017enosti na webu specializovan\u00e9m na <a href=\"https:\/\/nbaem.com\/cs\/magnets-for-green-energy\/\" target=\"_blank\" rel=\"noopener\">magnety pro zelenou energii<\/a> aby bylo mo\u017en\u00e9 zjistit, co nejl\u00e9pe vyhovuje aplikaci.<\/p>\n<h2>Teplota a Magnetismus: Supers\u00edla Kobaltu<\/h2>\n<p>Nejv\u011bt\u0161\u00ed magnetick\u00e1 v\u00fdhoda kobaltu je jeho neuv\u011b\u0159iteln\u011b vysok\u00e1 Curieova teplota\u2014bod, kdy ztr\u00e1c\u00ed magnetismus. \u010cist\u00fd kobalt si udr\u017e\u00ed siln\u00fd magnetismus a\u017e do p\u0159ibli\u017en\u011b <strong>1121 \u00b0C<\/strong>, co\u017e je daleko nad \u017eelezem nebo niklem. To znamen\u00e1, \u017ee magnety na b\u00e1zi kobaltu mohou udr\u017eet svou magnetickou s\u00edlu i p\u0159i extr\u00e9mn\u00edm teple.<\/p>\n<p>Magnety samarium-kobalt (SmCo), kter\u00e9 kombinuj\u00ed kobalt s prvky vz\u00e1cn\u00fdch zemin, maj\u00ed ni\u017e\u0161\u00ed Curieovu teplotu kolem <strong>300-350 \u00b0C<\/strong>. A\u010dkoliv je to mnohem ni\u017e\u0161\u00ed ne\u017e u \u010dist\u00e9ho kobaltu, st\u00e1le je to mnohem vy\u0161\u0161\u00ed ne\u017e u b\u011b\u017en\u00fdch neodymov\u00fdch magnet\u016f. D\u00edky tomu jsou magnety SmCo cen\u011bny v odv\u011btv\u00edch, jako je letectv\u00ed a vesm\u00edrn\u00fd pr\u016fzkum, kde mus\u00ed magnety spolehliv\u011b fungovat p\u0159i vysok\u00fdch teplot\u00e1ch, nap\u0159\u00edklad v proudov\u00fdch motorech.<\/p>\n<p>D\u00edky t\u00e9to tepeln\u011b odolnosti z\u016fst\u00e1vaj\u00ed magnety SmCo volbou \u010d\u00edslo jedna pro drsn\u00e9, hork\u00e9 prost\u0159ed\u00ed, kde by jin\u00e9 selhaly. To \u010din\u00ed magnetick\u00e9 vlastnosti kobaltu mimo\u0159\u00e1dn\u011b cenn\u00fdmi, nejen kv\u016fli jejich s\u00edle nebo velikosti.<\/p>\n<p>Pro v\u00edce informac\u00ed o tom, jak r\u016fzn\u00e9 magnety funguj\u00ed p\u0159i zah\u0159\u00e1t\u00ed, si m\u016f\u017eete prohl\u00e9dnout podrobn\u00e9 informace o<span style=\"color: #993300;\"><strong> <a style=\"color: #993300;\" href=\"https:\/\/nbaem.com\/cs\/anisotropic-magnet-vs-isotropic-magnet\/\" target=\"_blank\" rel=\"noopener\">anizotropn\u00edch vs. izotropn\u00edch magnetech<\/a>.<\/strong><\/span><\/p>\n<h2>Pou\u017e\u00edv\u00e1 se \u010dist\u00fd kobalt jako magnet v pr\u016fmyslu?<\/h2>\n<p>\u010cist\u00fd kobalt je z\u0159\u00eddka pou\u017e\u00edv\u00e1n jako magnet v pr\u016fmyslu. A\u010dkoliv je p\u0159irozen\u011b feromagnetick\u00fd, jeho cena a mechanick\u00e1 slabost jej \u010din\u00ed nepraktick\u00fdm pro v\u011bt\u0161inu aplikac\u00ed. M\u00edsto toho pr\u016fmysl preferuje slitiny kobaltu nebo magnety na b\u00e1zi kobaltu, jako je samarium-kobalt (SmCo), kter\u00e9 nab\u00edzej\u00ed lep\u0161\u00ed v\u00fdkon a odolnost. P\u0159\u00edle\u017eitostn\u011b se v niche magnetick\u00fdch konstrukc\u00edch pou\u017e\u00edv\u00e1 i spojovan\u00fd pr\u00e1\u0161ek kobaltu, ale tyto p\u0159\u00edpady jsou vz\u00e1cn\u00e9 kv\u016fli omezen\u00e9 pevnosti a vy\u0161\u0161\u00edm n\u00e1klad\u016fm. Pro v\u011bt\u0161inu magnetick\u00fdch pot\u0159eb je kobalt vhodn\u011bj\u0161\u00ed jako sou\u010d\u00e1st slitiny ne\u017e v \u010dist\u00e9 form\u011b.<\/p>\n<h2>Kobalt v modern\u00edch bateri\u00edch elektromobil\u016f vs. kobalt v magnetech \u2013 Odstran\u011bn\u00ed zmatku<\/h2>\n<p>Je d\u016fle\u017eit\u00e9 objasnit b\u011b\u017en\u00e9 nedorozum\u011bn\u00ed: kobalt pou\u017e\u00edvan\u00fd v pevn\u00fdch magnetech je kovov\u00fd kobalt, kter\u00fd je velmi odli\u0161n\u00fd od slou\u010denin kobaltu nach\u00e1zej\u00edc\u00edch se v lithio-iontov\u00fdch (Li-ion) bateri\u00edch pro elektromobily. V magnetech je kobalt cen\u011bn pro sv\u00e9 feromagnetick\u00e9 vlastnosti, zejm\u00e9na v slitin\u00e1ch samarium-kobalt (SmCo). Mezit\u00edm v bateri\u00edch elektromobil\u016f se kobalt pou\u017e\u00edv\u00e1 hlavn\u011b v chemick\u00fdch form\u00e1ch, jako je hydroxid kobaltat\u00fd nebo s\u00edran kobaltat\u00fd, kter\u00e9 hraj\u00ed roli v elektrochemii baterie, ale nevykazuj\u00ed magnetismus.<\/p>\n<p>Navzdory t\u011bmto rozd\u00edl\u016fm sd\u00edlej\u00ed oba pr\u016fmysly v\u00fdzvy t\u00fdkaj\u00edc\u00ed se stability dodavatelsk\u00e9ho \u0159et\u011bzce a etick\u00e9ho z\u00edsk\u00e1v\u00e1n\u00ed. Odpov\u011bdn\u00e9 t\u011b\u017een\u00ed kobaltu je kl\u00ed\u010dov\u00e9, a\u0165 u\u017e kon\u010d\u00ed v vysoce v\u00fdkonn\u00fdch magnetech pou\u017e\u00edvan\u00fdch v letectv\u00ed nebo v bateri\u00edch poh\u00e1n\u011bj\u00edc\u00edch elektromobily. Pochopen\u00ed tohoto rozd\u00edlu pom\u00e1h\u00e1 spot\u0159ebitel\u016fm i v\u00fdrobc\u016fm ocenit rozmanit\u00e9 role kobaltu bez zmatku.<\/p>\n<p>Pro v\u00edce informac\u00ed o roli kobaltu v magnetech a jejich v\u00fdkonu si p\u0159e\u010dt\u011bte n\u00e1\u0161 podrobn\u00fd srovn\u00e1vac\u00ed p\u0159ehled magnet\u016f samarium-kobalt a neodymov\u00fdch magnet\u016f.<\/p>\n<h2>B\u011b\u017en\u00e9 m\u00fdty a \u010dasto kladen\u00e9 ot\u00e1zky o magnetismu kobaltu<\/h2>\n<h3>Je kobalt v\u00edce magnetick\u00fd ne\u017e neodym?<\/h3>\n<p>Ne \u00fapln\u011b. A\u010dkoliv neodymov\u00e9 magnety jsou siln\u011bj\u0161\u00ed p\u0159i pokojov\u00e9 teplot\u011b, magnety na b\u00e1zi kobaltu, jako je samarium-kobalt (SmCo), p\u0159ekon\u00e1vaj\u00ed neodym, pokud jde o <strong>odolnost v\u016f\u010di vysok\u00fdm teplot\u00e1m<\/strong>. Magnetick\u00e9 vlastnosti kobaltu z\u016fst\u00e1vaj\u00ed stabiln\u00ed i p\u0159i teplot\u00e1ch, p\u0159i kter\u00fdch neodymov\u00e9 magnety ztr\u00e1cej\u00ed pevnost.<\/p>\n<h3>P\u0159it\u00e1hne b\u011b\u017en\u00fd magnet kobalt?<\/h3>\n<p>Ano, kobalt je p\u0159irozen\u011b <strong>feromagnetick\u00e9<\/strong> a bude p\u0159itahov\u00e1n k b\u011b\u017en\u00e9mu magnetu pom\u011brn\u011b siln\u011b. To lze snadno vid\u011bt na jednoduch\u00e9m magnetu na ledni\u010dku.<\/p>\n<h3>Je kobalt magnetick\u00fd bez magnetizace?<\/h3>\n<p>Ano, kobalt je s\u00e1m o sob\u011b p\u0159irozen\u011b magnetick\u00fd d\u00edky sv\u00e9 atomov\u00e9 struktu\u0159e a <strong>nep\u00e1rov\u00fdm 3d elektron\u016fm<\/strong>. M\u016f\u017ee b\u00fdt trvale magnetizov\u00e1n velmi snadno, co\u017e je d\u016fvod, pro\u010d je kobalt kl\u00ed\u010dovou slo\u017ekou v r\u016fzn\u00fdch <strong>trval\u00e9 magnety<\/strong>.<\/p>\n<p>Pokud v\u00e1s zaj\u00edmaj\u00ed teplotn\u00ed vlivy na magnety, jako je neodym a kobalt, pod\u00edvejte se na tento podrobn\u00fd pr\u016fvodce o <a href=\"https:\/\/nbaem.com\/cs\/what-is-the-effect-of-heating-neodymium-magnets\/\" target=\"_blank\" rel=\"noopener\">vlivu zah\u0159\u00edv\u00e1n\u00ed neodymov\u00fdch magnet\u016f<\/a>.<\/p>\n<p>&nbsp;<\/p>\n<h2>Praktick\u00e9 pou\u017eit\u00ed magnet\u016f na b\u00e1zi kobaltu dnes (2025)<\/h2>\n<p>Magnety na b\u00e1zi kobaltu, jako je SmCo, z\u016fst\u00e1vaj\u00ed kl\u00ed\u010dov\u00e9 v n\u011bkolika pokro\u010dil\u00fdch oblastech d\u00edky sv\u00e9 jedine\u010dn\u00e9 kombinaci pevnosti a odolnosti v\u016f\u010di teplot\u00e1m. Tady je obvykle najdete:<\/p>\n<ul>\n<li><strong>Leteck\u00fd pr\u016fmysl a obrana:<\/strong> Jejich vysok\u00e1 Curieho teplota a odolnost v\u016f\u010di korozi je \u010din\u00ed ide\u00e1ln\u00edmi pro proudov\u00e9 motory, naviga\u010dn\u00ed syst\u00e9my a vojensk\u00e9 vybaven\u00ed, kde je spolehlivost za extr\u00e9mn\u00edch podm\u00ednek z\u00e1sadn\u00ed.<\/li>\n<li><strong>L\u00e9ka\u0159sk\u00e1 za\u0159\u00edzen\u00ed (MRI):<\/strong> Magnety SmCo poskytuj\u00ed stabiln\u00ed a siln\u00e1 magnetick\u00e1 pole pot\u0159ebn\u00e1 v MRI p\u0159\u00edstroj\u00edch, zaji\u0161\u0165uj\u00edc\u00ed jasnou kvalitu obrazu bez magnetick\u00e9 degradace v pr\u016fb\u011bhu \u010dasu.<\/li>\n<li><strong>Motory a gener\u00e1tory s vysokou teplotou:<\/strong> Tyto magnety spolehliv\u011b funguj\u00ed v motorech a gener\u00e1torech vystaven\u00fdch vysok\u00fdm teplot\u00e1m, nap\u0159\u00edklad v elektrick\u00fdch vozidlech nebo pr\u016fmyslov\u00e9m vybaven\u00ed.<\/li>\n<li><strong>Hlubinn\u00e9 n\u00e1stroje pro t\u011b\u017ebu ropy a plynu:<\/strong> Drsn\u00e9 prost\u0159ed\u00ed hluboko pod zem\u00ed vy\u017eaduje magnety, kter\u00e9 zvl\u00e1dnou intenzivn\u00ed teplo a korozi \u2014 magnety na b\u00e1zi kobaltu jsou p\u0159esn\u011b to, co pot\u0159ebujete.<\/li>\n<\/ul>\n<p>Tato praktick\u00e1 v\u0161estrannost je d\u016fvodem, pro\u010d si magnety na b\u00e1zi kobaltu st\u00e1le udr\u017euj\u00ed silnou pozici, i p\u0159es p\u0159\u00edchod nov\u011bj\u0161\u00edch materi\u00e1l\u016f.<\/p>\n<h2>Budouc\u00ed trendy: Budeme st\u00e1le pot\u0159ebovat kobalt v magnetech?<\/h2>\n<p>Budoucnost kobaltu v magnetech je \u017ehav\u00fdm t\u00e9matem, proto\u017ee v\u011bdci usiluj\u00ed o sn\u00ed\u017een\u00ed nebo \u00fapln\u00e9 odstran\u011bn\u00ed pou\u017eit\u00ed kobaltu v magnetech vz\u00e1cn\u00fdch zemin. To je hlavn\u011b zp\u016fsobeno n\u00e1klady na kov a etick\u00fdmi ot\u00e1zkami jeho z\u00edsk\u00e1v\u00e1n\u00ed. Objevuj\u00ed se nov\u00e9 materi\u00e1ly s men\u0161\u00edm nebo \u017e\u00e1dn\u00fdm obsahem kobaltu, kter\u00e9 maj\u00ed za c\u00edl dos\u00e1hnout nebo p\u0159ekonat magnetick\u00fd v\u00fdkon tradi\u010dn\u00edch magnet\u016f na b\u00e1zi kobaltu.<\/p>\n<p>Nicm\u00e9n\u011b, dne\u0161n\u00ed realitou je, \u017ee magnety na b\u00e1zi samaria a kobaltu (SmCo) z\u016fst\u00e1vaj\u00ed nenahraditeln\u00e9 v ur\u010dit\u00fdch aplikac\u00edch s vysokou popt\u00e1vkou. Jejich v\u00fdjime\u010dn\u00e1 odolnost v\u016f\u010di teplot\u00e1m a stabilita je udr\u017euj\u00ed na \u0161pici v letectv\u00ed, obran\u011b a dal\u0161\u00edch odv\u011btv\u00edch, kde je spolehlivost za extr\u00e9mn\u00edch podm\u00ednek nezbytn\u00e1.<\/p>\n<p>Zat\u00edmco se trh s magnety vyv\u00edj\u00ed, jedine\u010dn\u00e9 magnetick\u00e9 vlastnosti a tepeln\u00e1 odolnost kobaltu zaji\u0161\u0165uj\u00ed, \u017ee bude st\u00e1le hr\u00e1t kl\u00ed\u010dovou roli \u2014 zejm\u00e9na v niche oblastech, kde zat\u00edm nemohou konkurovat alternativy. Pro podrobn\u00fd p\u0159ehled o pou\u017eit\u00ed permanentn\u00edch magnet\u016f, v\u010detn\u011b role magnet\u016f s vysokou teplotou, si p\u0159e\u010dt\u011bte tento podrobn\u00fd p\u0159ehled <a href=\"https:\/\/nbaem.com\/cs\/new-applications-of-permanent-magnets\/\" target=\"_blank\" rel=\"noopener\">nov\u00fdch aplikac\u00ed permanentn\u00edch magnet\u016f<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Ano, kobalt je siln\u011b feromagnetick\u00fd s nejvy\u0161\u0161\u00ed Curieovou teplotou, objevte jeho magnetickou s\u00edlu a vyu\u017eit\u00ed v magnetech s vysokou teplotou.<\/p>","protected":false},"author":1,"featured_media":3452,"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-3453","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\/Is_cobalt_magnetic_O6cqcnx2r.webp","_links":{"self":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/3453","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/comments?post=3453"}],"version-history":[{"count":2,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/3453\/revisions"}],"predecessor-version":[{"id":3464,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/3453\/revisions\/3464"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media\/3452"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media?parent=3453"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/categories?post=3453"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/tags?post=3453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}