{"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\/cs\/high-temperature-magnets\/","title":{"rendered":"Magnety s vysokou teplotou"},"content":{"rendered":"

Magnety se pou\u017e\u00edvaj\u00ed v mnoha odv\u011btv\u00edch od v\u00fdroby po stroj\u00edrenstv\u00ed a \u010dasto mus\u00ed fungovat za extr\u00e9mn\u00edch teplotn\u00edch podm\u00ednek. V\u00fdb\u011br spr\u00e1vn\u00e9ho magnetu pro vysokoteplotn\u00ed aplikace je kl\u00ed\u010dov\u00fd pro dosa\u017een\u00ed nejlep\u0161\u00edho v\u00fdkonu a odolnosti. V tomto \u010dl\u00e1nku se pod\u00edv\u00e1me na to, jak teplota ovliv\u0148uje magnety, a p\u0159ehledn\u011b p\u0159edstav\u00edme hlavn\u00ed typy vysokoteplotn\u011b odoln\u00fdch magnet\u016f, jejich vlastnosti a typick\u00e9 pou\u017eit\u00ed.<\/p>\n

 <\/p>\n

Jak teplota ovliv\u0148uje v\u00fdkon magnetu<\/span><\/h2>\n

Ne\u017e se pust\u00edme do typ\u016f vysokoteplotn\u011b odoln\u00fdch magnet\u016f, poj\u010fme si \u0159\u00edct, jak okoln\u00ed teplota ovliv\u0148uje magnetick\u00e9 vlastnosti. Obecn\u011b teplo sni\u017euje s\u00edlu magnetu a chlad naopak zvy\u0161uje jeho magnetismus. Vysoce teplotn\u00ed prost\u0159ed\u00ed m\u016f\u017ee zp\u016fsobit, \u017ee magnety trvale ztrat\u00ed \u010d\u00e1st sv\u00e9 magnetizace, v z\u00e1vislosti na tom, jak daleko je provozn\u00ed teplota nad limity magnetu.<\/p>\n

1) Maxim\u00e1ln\u00ed provozn\u00ed teplota vs. Curieova teplota:<\/strong><\/p>\n

Ka\u017ed\u00fd magnet m\u00e1 maxim\u00e1ln\u00ed provozn\u00ed teplotu, p\u0159i kter\u00e9 za\u010d\u00edn\u00e1 ztr\u00e1cet sv\u00e9 magnetick\u00e9 vlastnosti. Jakmile tuto teplotu p\u0159ekro\u010d\u00edte, dojde k nevratn\u00e9 ztr\u00e1t\u011b magnetismu. Curieova teplota je bod, kdy magnet ztr\u00e1c\u00ed ve\u0161kerou magnetizaci. Ob\u011b tyto teploty jsou odli\u0161n\u00e9 pro r\u016fzn\u00e9 typy a t\u0159\u00eddy magnet\u016f.<\/p>\n

2) Reverzn\u00ed vs. Nevratn\u00e1 ztr\u00e1ta magnetismu:<\/strong><\/p>\n

Pokud magnet zah\u0159ejete nad jeho maxim\u00e1ln\u00ed provozn\u00ed teplotu, ale ne na Curieovu teplotu, m\u016f\u017ee doj\u00edt k reverzn\u00ed ztr\u00e1t\u011b. To znamen\u00e1, \u017ee s\u00edla magnetu se m\u016f\u017ee po ochlazen\u00ed vr\u00e1tit. Pokud jej v\u0161ak vystav\u00edte extr\u00e9mn\u00edm teplot\u00e1m na del\u0161\u00ed dobu nebo jej zah\u0159ejete na Curieovu teplotu, dojde k nevratn\u00e9 ztr\u00e1t\u011b. To znamen\u00e1, \u017ee magnetismus se nevr\u00e1t\u00ed.<\/p>\n

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

B\u011b\u017en\u00e9 typy vysokoteplotn\u011b odoln\u00fdch magnet\u016f<\/strong><\/span><\/h2>\n

Zde jsou nejb\u011b\u017en\u011bj\u0161\u00ed vysokoteplotn\u011b odoln\u00e9 magnety, kter\u00e9 m\u016f\u017eete pou\u017e\u00edt. Ka\u017ed\u00fd m\u00e1 jedine\u010dn\u00e9 vlastnosti, kter\u00e9 ho \u010din\u00ed vhodn\u00fdm pro r\u016fzn\u00e9 aplikace.<\/p>\n

    \n
  1. Magnety AlNiCo (hlin\u00edk-niklov\u00fd-kobaltov\u00fd)<\/strong><\/span><\/a><\/li>\n<\/ol>\n

    Maxim\u00e1ln\u00ed provozn\u00ed teplota:<\/strong> A\u017e do 525\u00b0C<\/p>\n

    Teplota Curie<\/strong>: ~850\u00b0C<\/p>\n

    Magnety AlNiCo jsou vyrobeny z slitiny hlin\u00edku, niklu, kobaltu a \u017eeleza. Dok\u00e1\u017eou zvl\u00e1dnout nejvy\u0161\u0161\u00ed teploty ze v\u0161ech komer\u010dn\u00edch magnet\u016f, a\u017e do 525\u00b0C. Pou\u017e\u00edvaj\u00ed se v senzorech, kytarov\u00fdch sn\u00edma\u010d\u00edch a ve vysokoteplotn\u00edch pr\u016fmyslov\u00fdch aplikac\u00edch, proto\u017ee jsou velmi tepeln\u011b stabiln\u00ed. A\u010dkoliv je v mnoha aplikac\u00edch nahradily siln\u011bj\u0161\u00ed magnety vz\u00e1cn\u00fdch zemin, lid\u00e9 st\u00e1le r\u00e1di pou\u017e\u00edvaj\u00ed magnety AlNiCo v m\u00edstech s extr\u00e9mn\u00edm teplem.<\/p>\n

      \n
    1. Ferritov\u00e9 (keramick\u00e9) magnety<\/strong><\/span><\/a><\/li>\n<\/ol>\n

      Maxim\u00e1ln\u00ed provozn\u00ed teplota: A\u017e do 250\u00b0C<\/p>\n

      Curieova teplota: ~450\u00b0C<\/p>\n

      Ferritov\u00e9 magnety, tak\u00e9 naz\u00fdvan\u00e9 keramick\u00e9 magnety, jsou p\u0159ev\u00e1\u017en\u011b vyrobeny z oxidu \u017eeleza a dal\u0161\u00edch kovov\u00fdch prvk\u016f. A\u010dkoliv maj\u00ed ni\u017e\u0161\u00ed teplotn\u00ed limit ne\u017e ostatn\u00ed vysokoteplotn\u00ed magnety, jsou levn\u00e9 a elektricky izola\u010dn\u00ed. Najdete je v transform\u00e1torech a po\u010d\u00edta\u010dov\u00fdch kabelech, proto\u017ee jsou ekonomick\u00fdm \u0159e\u0161en\u00edm pro aplikace nep\u0159esahuj\u00edc\u00ed 250\u00b0C.<\/p>\n

        \n
      1. Magnety SmCo (samon\u00e1 Cobaltov\u00e9)<\/strong><\/span><\/a><\/li>\n<\/ol>\n

        Maxim\u00e1ln\u00ed provozn\u00ed teplota: 310-400\u00b0C<\/p>\n

        Curieova teplota: ~700\u00b0C<\/p>\n

        Magnety Samarium Kobalt (SmCo) jsou velmi odoln\u00e9, maj\u00ed vysokou magnetickou s\u00edlu a vynikaj\u00edc\u00ed odolnost v\u016f\u010di teplot\u00e1m. Tyto magnety jsou skv\u011bl\u00e9 pro prost\u0159ed\u00ed s vysok\u00fdmi teplotami, zejm\u00e9na v letectv\u00ed a automobilov\u00e9m pr\u016fmyslu. Jsou odoln\u011bj\u0161\u00ed v\u016f\u010di korozi a oxidaci ne\u017e neodymov\u00e9 magnety a maj\u00ed vynikaj\u00edc\u00ed odolnost proti demagnetizaci. Proto je vid\u00edte pou\u017e\u00edvat v aplikac\u00edch s vysok\u00fdmi i n\u00edzk\u00fdmi teplotn\u00edmi extr\u00e9my.\u00a0<\/strong><\/p>\n

          \n
        1. NdFeB magnety (Neodym-\u017delezo-B\u00f3r)<\/strong><\/span><\/a><\/li>\n<\/ol>\n

          Maxim\u00e1ln\u00ed provozn\u00ed teplota: 80-200\u00b0C v z\u00e1vislosti na t\u0159\u00edd\u011b<\/p>\n

          Teplota Curie: 310-340\u00b0C<\/p>\n

          Neodymov\u00e9 magnety jsou nejsiln\u011bj\u0161\u00ed komer\u010dn\u011b dostupn\u00e9 magnety, kter\u00e9 m\u016f\u017eete z\u00edskat z hlediska magnetick\u00e9 s\u00edly. Nicm\u00e9n\u011b jejich odolnost v\u016f\u010di vysok\u00fdm teplot\u00e1m je ni\u017e\u0161\u00ed ne\u017e u magnet\u016f SmCo a AlNiCo. Neodymov\u00e9 magnety maj\u00ed r\u016fzn\u00e9 t\u0159\u00eddy podle toho, kolik tepla dok\u00e1\u017eou vydr\u017eet:<\/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

          V prost\u0159ed\u00ed s vysokou teplotou ztr\u00e1cej\u00ed neodymov\u00e9 magnety 0,11% sv\u00e9 magnetismu za ka\u017ed\u00fd 1\u00b0C n\u00e1r\u016fst teploty. Tato ztr\u00e1ta je obvykle reverzibiln\u00ed, pokud nep\u0159ekro\u010d\u00edte maxim\u00e1ln\u00ed teplotu.<\/p>\n

          \"maxim\u00e1ln\u00ed

          Maxim\u00e1ln\u00ed pracovn\u00ed teplota pro magnet AlNiCo, magnet ferrit, magnet SmCo, magnet NdFeB<\/p><\/div>\n

           <\/p>\n

          Kl\u00ed\u010dov\u00e9 faktory ovliv\u0148uj\u00edc\u00ed v\u00fdkon magnetu p\u0159i vysok\u00fdch teplot\u00e1ch<\/strong><\/span><\/h2>\n

          Krom\u011b typu magnetu je t\u0159eba vz\u00edt v \u00favahu i n\u011bkolik dal\u0161\u00edch v\u011bc\u00ed, pokud jde o v\u00fdkon magnet\u016f p\u0159i vysok\u00fdch teplot\u00e1ch:<\/p>\n

          Okoln\u00ed teplota a vlhkost:<\/strong><\/p>\n

          Magnety vystaven\u00e9 vysok\u00fdm teplot\u00e1m a vlhk\u00fdm podm\u00ednk\u00e1m se mohou rychleji zhor\u0161it. Neodymov\u00e9 magnety nap\u0159\u00edklad koroduj\u00ed, proto jsou obvykle pota\u017een\u00e9 n\u011b\u010d\u00edm jako nikl nebo epoxid, aby je chr\u00e1nily v takov\u00fdch prost\u0159ed\u00edch.<\/p>\n

          Slo\u017een\u00ed materi\u00e1lu:<\/strong><\/p>\n

          R\u016fzn\u00e9 magnety jsou vyrobeny z r\u016fzn\u00fdch materi\u00e1l\u016f a maj\u00ed proto r\u016fzn\u00e9 odolnosti. Ferritov\u00e9 magnety jsou nap\u0159\u00edklad keramick\u00e9, tak\u017ee jsou velmi odoln\u00e9 v\u016f\u010di teplu, ale k\u0159ehk\u00e9. Neodymov\u00e9 magnety jsou naopak vyrobeny z kovov\u00e9 slitiny, tak\u017ee je t\u0159eba je potahovat, aby vydr\u017eely, zejm\u00e9na v vlhk\u00fdch nebo korozivn\u00edch prost\u0159ed\u00edch.<\/p>\n

           <\/p>\n

          Aplikace magnet\u016f p\u0159i vysok\u00fdch teplot\u00e1ch<\/strong><\/span><\/h2>\n

          Existuje mnoho odv\u011btv\u00ed, kde pot\u0159ebujete magnety, kter\u00e9 zvl\u00e1dnou vysok\u00e9 teploty, proto\u017ee v\u00fdkon mus\u00ed z\u016fstat konzistentn\u00ed, kdy\u017e se v\u011bci zah\u0159ej\u00ed:<\/p>\n

          Leteck\u00fd pr\u016fmysl: <\/strong>Turb\u00ednov\u00e9 motory a dal\u0161\u00ed d\u00edly pou\u017e\u00edvaj\u00ed magnety s vysokou teplotn\u00ed odolnost\u00ed, kde je teplota vysok\u00e1.<\/p>\n

          Automobilov\u00fd pr\u016fmysl: <\/strong>Elektrick\u00e9 motory, senzory a dal\u0161\u00ed \u010d\u00e1sti automobilu pou\u017e\u00edvaj\u00ed magnety, kter\u00e9 zvl\u00e1dnou vysok\u00e9 teploty, proto\u017ee motor a dal\u0161\u00ed \u010d\u00e1sti se zah\u0159\u00edvaj\u00ed.<\/p>\n

          V\u00fdroba a in\u017een\u00fdrstv\u00ed:<\/strong> Magnety s vysokou teplotn\u00ed odolnost\u00ed se pou\u017e\u00edvaj\u00ed v pr\u016fmyslov\u00fdch procesech, jako je sva\u0159ov\u00e1n\u00ed nebo obr\u00e1b\u011bn\u00ed za vysok\u00fdch teplot. Zachov\u00e1vaj\u00ed si magnetismus i p\u0159es kol\u00eds\u00e1n\u00ed teploty.<\/p>\n

          L\u00e9ka\u0159sk\u00fdch p\u0159\u00edstroj\u016f:<\/strong> N\u011bkter\u00e9 l\u00e9ka\u0159sk\u00e9 p\u0159\u00edstroje a za\u0159\u00edzen\u00ed pot\u0159ebuj\u00ed magnety, kter\u00e9 funguj\u00ed p\u0159i steriliza\u010dn\u00edch teplot\u00e1ch, kter\u00e9 jsou vysok\u00e9.<\/p>\n

           <\/p>\n

          Jak vybrat magnety s vysokou teplotn\u00ed odolnost\u00ed<\/span><\/h2>\n

          Spr\u00e1vn\u00fd magnet s vysokou teplotn\u00ed odolnost\u00ed pro va\u0161e pou\u017eit\u00ed z\u00e1vis\u00ed na va\u0161ich konkr\u00e9tn\u00edch provozn\u00edch podm\u00ednk\u00e1ch. Mus\u00edte zn\u00e1t maxim\u00e1ln\u00ed teplotu, po kterou bude magnet vystaven, a faktory prost\u0159ed\u00ed, jako je vlhkost. Magnety AlNiCo, ferritov\u00e9, SmCo a NdFeB maj\u00ed r\u016fzn\u00e9 \u00farovn\u011b odolnosti v\u016f\u010di teplu. Ka\u017ed\u00fd se pou\u017e\u00edv\u00e1 v r\u016fzn\u00fdch komer\u010dn\u00edch a pr\u016fmyslov\u00fdch aplikac\u00edch. P\u0159ed v\u00fdb\u011brem magnetu mus\u00edte zn\u00e1t maxim\u00e1ln\u00ed provozn\u00ed teplotu a Curieovu teplotu magnetu.<\/p>\n

          Pro v\u00edce informac\u00ed o magnetech s vysokou teplotn\u00ed odolnost\u00ed nebo pro z\u00edsk\u00e1n\u00ed nab\u00eddky na va\u0161e magnetick\u00e9 pot\u0159eby nav\u0161tivte NBAEM<\/a>. Spolupracujeme s firmami a pr\u016fmyslov\u00fdmi odv\u011btv\u00edmi po cel\u00e9m sv\u011bt\u011b na poskytov\u00e1n\u00ed vysoce kvalitn\u00edch \u0159e\u0161en\u00ed.<\/p>\n

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

          Magnety se pou\u017e\u00edvaj\u00ed v mnoha odv\u011btv\u00edch od v\u00fdroby po stroj\u00edrenstv\u00ed a \u010dasto je vy\u017eadov\u00e1no, aby fungovaly za extr\u00e9mn\u00edch teplotn\u00edch podm\u00ednek. V\u00fdb\u011br spr\u00e1vn\u00e9ho magnetu pro vysokoteplotn\u00ed aplikace je kl\u00ed\u010dov\u00fd pro dosa\u017een\u00ed nejlep\u0161\u00edho v\u00fdkonu a odolnosti. V tomto \u010dl\u00e1nku se pod\u00edv\u00e1me na to, jak teplota ovliv\u0148uje magnety, a projdeme si [\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\/cs\/wp-json\/wp\/v2\/posts\/1451","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=1451"}],"version-history":[{"count":3,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1451\/revisions"}],"predecessor-version":[{"id":1455,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1451\/revisions\/1455"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media\/1453"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media?parent=1451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/categories?post=1451"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/tags?post=1451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}