Karbid k\u0159em\u00edku (SiC) je extr\u00e9mn\u011b tvrd\u00e1 chemick\u00e1 slou\u010denina sest\u00e1vaj\u00edc\u00ed z k\u0159em\u00edku a uhl\u00edku, kter\u00e1 tvo\u0159\u00ed polovodi\u010dov\u00e9 sou\u010d\u00e1stky a m\u016f\u017ee b\u00fdt formov\u00e1na do tvrd\u00fdch keramick\u00fdch materi\u00e1l\u016f pro aplikace vy\u017eaduj\u00edc\u00ed vysokou odolnost, jako jsou brzdy automobil\u016f a nepr\u016fst\u0159eln\u00e9 vesty.<\/p>\n
SiC je v\u0161eobecn\u011b uzn\u00e1v\u00e1n pro svou vynikaj\u00edc\u00ed tepelnou vodivost. V tomto \u010dl\u00e1nku zkoum\u00e1me vztah mezi tepelnou vodivost\u00ed, f\u00e1zov\u00fdm slo\u017een\u00edm a mikrostrukturou 3C-SiC.<\/p>\n
Karbid k\u0159em\u00edku je jednou z nejtvrd\u0161\u00edch, nejpevn\u011bj\u0161\u00edch a \u017e\u00e1ruvzdorn\u00fdch keramik na trhu. Krom\u011b toho je d\u00edky sv\u00e9 odolnosti proti korozi a tepeln\u00e9 vodivosti vhodn\u00e1 pro \u0159ezn\u00e9 n\u00e1stroje, brusn\u00e9 kotou\u010de a abraziva, sou\u010d\u00e1sti odoln\u00e9 proti opot\u0159eben\u00ed, jako jsou t\u011bsnic\u00ed plochy vysokoteplotn\u00edch \u010derpadel a polovodi\u010dov\u00e9 substr\u00e1ty.<\/p>\n
Vysoce \u010dist\u00fd SiC m\u00e1 extr\u00e9mn\u011b vysokou tepelnou vodivost - srovnatelnou s diamantem a vy\u0161\u0161\u00ed ne\u017e m\u011b\u010f! N\u00edzk\u00e1 tepeln\u00e1 rozta\u017enost a vysok\u00e1 vodivost z n\u011bj \u010din\u00ed vynikaj\u00edc\u00ed \u017e\u00e1ruvzdorn\u00fd materi\u00e1l.<\/p>\n
GNP byly \u00fasp\u011b\u0161n\u011b integrov\u00e1ny do hust\u00e9ho karbidu k\u0159em\u00edku pomoc\u00ed sp\u00e9k\u00e1n\u00ed v kapaln\u00e9 f\u00e1zi v jiskrov\u00e9m plazmatu za pou\u017eit\u00ed Y2O3 a Al2O3 jako pomocn\u00fdch l\u00e1tek p\u0159i sp\u00e9k\u00e1n\u00ed a jejich za\u010dlen\u011bn\u00ed vedlo k vysok\u00e9 tepeln\u00e9 anizotropii s ab-rovinnou tepelnou difuzivitou, kter\u00e1 se zv\u00fd\u0161ila o 30% kolmo na osu lisov\u00e1n\u00ed SPS, zat\u00edmco kolmo se v\u00fdrazn\u011b sn\u00ed\u017eila. To lze vysv\u011btlit siln\u00fdm p-dopingem t\u011bchto kompozit\u016f.<\/p>\n
Karbid k\u0159em\u00edku (SiC) je jedn\u00edm z nejleh\u010d\u00edch, nejtvrd\u0161\u00edch a nejpevn\u011bj\u0161\u00edch pokro\u010dil\u00fdch keramick\u00fdch materi\u00e1l\u016f. Vyzna\u010duje se mnoha pokro\u010dil\u00fdmi vlastnostmi, jako je chemick\u00e1 odolnost, zachov\u00e1n\u00ed pevnosti p\u0159i zv\u00fd\u0161en\u00fdch teplot\u00e1ch a n\u00edzk\u00e1 tepeln\u00e1 rozta\u017enost.<\/p>\n
D\u00edky sv\u00e9 schopnosti odol\u00e1vat rychl\u00fdm zm\u011bn\u00e1m teploty nebo tepeln\u00fdm \u0161ok\u016fm je titan ide\u00e1ln\u00edm materi\u00e1lem pro sou\u010d\u00e1stky pou\u017e\u00edvan\u00e9 v jadern\u00fdch elektr\u00e1rn\u00e1ch a leteck\u00fdch motorech. Krom\u011b toho je d\u00edky sv\u00fdm vlastnostem vhodn\u00fd pro pou\u017eit\u00ed jako materi\u00e1l zrcadel n\u011bkolika astronomick\u00fdch dalekohled\u016f, nap\u0159\u00edklad Herschelova vesm\u00edrn\u00e9ho dalekohledu.<\/p>\n
3C-SiC vykazuje n\u00edzkou tepelnou rozta\u017enost d\u00edky sv\u00e9 kubick\u00e9 krystalov\u00e9 struktu\u0159e a absenci dlouh\u00fdch deformaci, jako jsou dislokace. Je v\u0161ak t\u0159eba poznamenat, \u017ee tepeln\u00e1 vodivost SiC se zvy\u0161uje s rostouc\u00ed koncentrac\u00ed elektron\u016f, co\u017e m\u016f\u017ee zm\u011bnit jeho rozta\u017enost a chov\u00e1n\u00ed.<\/p>\n
M\u011b\u0159en\u00ed BO-TDTR ukazuj\u00ed hodnotu k v rovin\u011b, kter\u00e1 odpov\u00edd\u00e1 vlastn\u00ed hodnot\u011b 320 W m-1K-1 odhadnut\u00e9 z v\u00fdpo\u010dt\u016f podle prvn\u00edch princip\u016f pro dokonal\u00e9 vzorky 6H-SiC, co\u017e potvrzuje, \u017ee komer\u010dn\u011b dostupn\u00e9 vzorky jsou vysoce kvalitn\u00ed.<\/p>\n
Young\u016fv modul m\u011b\u0159\u00ed tuhost materi\u00e1l\u016f, tedy jejich odolnost v\u016f\u010di deformaci. In\u017een\u00fd\u0159i a materi\u00e1lov\u00ed v\u011bdci jej pova\u017euj\u00ed za neoceniteln\u00fd p\u0159i navrhov\u00e1n\u00ed konstrukc\u00ed nebo v\u00fdrobk\u016f, proto\u017ee jim umo\u017e\u0148uje vypo\u010d\u00edtat, jak velkou s\u00edlu materi\u00e1l vydr\u017e\u00ed, ne\u017e dojde k jeho ohnut\u00ed nebo poru\u0161en\u00ed p\u016fsoben\u00edm s\u00edly.<\/p>\n
Young\u016fv modul m\u011b\u0159\u00ed elastick\u00e9 vlastnosti, zat\u00edmco jeho nepru\u017en\u00e9 neboli tuh\u00e9 vlastnosti. Jeho hodnotu m\u016f\u017eete zm\u011b\u0159it tak, \u017ee na n\u011bj budete p\u016fsobit \u0159\u00edzen\u00fdm tahem pomoc\u00ed dr\u00e1\u017ekovan\u00fdch hmot, kter\u00e9 vytv\u00e1\u0159ej\u00ed \u0159\u00edzen\u00e9 nap\u011bt\u00ed a deformaci vzork\u016f materi\u00e1lu.<\/p>\n
V\u00fdsledky testov\u00e1n\u00ed Youngova modulu se li\u0161\u00ed v z\u00e1vislosti na metod\u011b pou\u017eit\u00e9 k v\u00fdrob\u011b vzork\u016f, p\u0159i\u010dem\u017e vzorky vyroben\u00e9 pomoc\u00ed kondenzace inertn\u00edho plynu maj\u00ed v\u00fdrazn\u011b ni\u017e\u0161\u00ed Young\u016fv modul ne\u017e vzorky vyroben\u00e9 jin\u00fdmi postupy. Krom\u011b toho se bin\u00e1rn\u00ed slitiny Ti-Nb vytla\u010duj\u00ed s klesaj\u00edc\u00edm C' (vypo\u010dten\u00fdm Youngov\u00fdm modulem pomoc\u00ed Hillovy aproximace); t\u00edm se sni\u017euje jejich Young\u016fv modul spolu se sn\u00ed\u017een\u00edm elastick\u00e9 konstanty.<\/p>\n
Karbid k\u0159em\u00edku (SiC) je anorganick\u00e1 polovodi\u010dov\u00e1 slou\u010denina slo\u017een\u00e1 z uhl\u00edku a k\u0159em\u00edku, kter\u00e1 m\u00e1 skv\u011bl\u00e9 mechanick\u00e9 a tepeln\u00e9 vlastnosti. SiC je vysoce odoln\u00fd v\u016f\u010di teplotn\u00edm \u0161ok\u016fm, co\u017e znamen\u00e1, \u017ee rychl\u00e9 v\u00fdkyvy teplot nepo\u0161kozuj\u00ed strukturu jeho materi\u00e1lu.<\/p>\n
Ocel je tak\u00e9 odoln\u00e1 proti korozi zp\u016fsoben\u00e9 kyselinami, tak\u017ee je ide\u00e1ln\u00ed pro aplikace, kde je vy\u017eadov\u00e1na odolnost proti korozi a vysok\u00e1 tvrdost a tuhost. Krom\u011b toho je tento materi\u00e1l d\u00edky sv\u00e9 n\u00edzk\u00e9 tepeln\u00e9 rozta\u017enosti vhodn\u00fd pro rychl\u00e9 zm\u011bny teplot.<\/p>\n
SiC je ide\u00e1ln\u00edm materi\u00e1lem pro aplikace obr\u00e1b\u011bn\u00ed kov\u016f s vysokou m\u00edrou fyzick\u00e9ho opot\u0159eben\u00ed, jako je pokovov\u00e1n\u00ed karbidem niklu a k\u0159em\u00edku nebo pl\u00e1tov\u00e1n\u00ed silicidem wolframu. Krom\u011b toho lze SiC nal\u00e9zt tak\u00e9 v podp\u011br\u00e1ch a lopatk\u00e1ch z\u00e1sobn\u00edk\u016f desti\u010dek v polovodi\u010dov\u00fdch pec\u00edch, kde je fyzik\u00e1ln\u00ed opot\u0159eben\u00ed hlavn\u00edm probl\u00e9mem; spojen\u00ed tohoto materi\u00e1lu s keramick\u00fdmi kompozity s karbidem b\u00f3ru nab\u00edz\u00ed pro tato pou\u017eit\u00ed maxim\u00e1ln\u00ed pom\u011br pevnosti a trvanlivosti.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon Carbide (SiC) is an extremely hard chemical compound consisting of silicon and carbon that forms semiconductor devices, and can be formed into hard ceramic materials for applications requiring high durability such as car brakes and bulletproof vests. SiC is widely recognized for its superior thermal conductivity. Here we explore the relationship between thermal conductivity, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[64],"tags":[],"class_list":["post-140","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/140","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/comments?post=140"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/140\/revisions"}],"predecessor-version":[{"id":141,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/140\/revisions\/141"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/media?parent=140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/categories?post=140"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/tags?post=140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}