Karbid k\u0159em\u00edku (SiC) je anorganick\u00e1 chemick\u00e1 slou\u010denina oxidu k\u0159emi\u010dit\u00e9ho a uhl\u00edku, kter\u00e1 byla poprv\u00e9 s\u00e9riov\u011b vyr\u00e1b\u011bna v roce 1893 pro pou\u017eit\u00ed jako brusn\u00fd materi\u00e1l. A\u010dkoli SiC existuje v p\u0159\u00edrod\u011b jako miner\u00e1l moissanit, masov\u00e1 v\u00fdroba za\u010dala a\u017e po tomto datu pro pou\u017eit\u00ed ve form\u011b pr\u00e1\u0161ku a krystal\u016f pro masovou spot\u0159ebu v brusn\u00fdch v\u00fdrobc\u00edch.<\/p>\n
Keramick\u00fd materi\u00e1l Cerakote je jedn\u00edm z nejtvrd\u0161\u00edch a nejleh\u010d\u00edch keramick\u00fdch materi\u00e1l\u016f, kter\u00fd se vyzna\u010duje vynikaj\u00edc\u00ed odolnost\u00ed proti korozi, od\u011bru a erozi a odol\u00e1v\u00e1 i extr\u00e9mn\u00edm teplot\u00e1m.<\/p>\n
Karbid k\u0159em\u00edku (SiC) je extr\u00e9mn\u011b tvrd\u00fd a pru\u017en\u00fd materi\u00e1l s vysokou odolnost\u00ed proti korozi a tepeln\u00e9 rozta\u017enosti, odoln\u00fd v\u016f\u010di kyselin\u00e1m a louh\u016fm a z\u00e1rove\u0148 slou\u017e\u00edc\u00ed jako elektrick\u00fd izolant.<\/p>\n
Na Zemi se SiC vyskytuje hojn\u011b jako miner\u00e1l moissanit, ve vesm\u00edru pak jako hv\u011bzdn\u00fd prach hv\u011bzd bohat\u00fdch na uhl\u00edk. SiC nach\u00e1z\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch v\u010detn\u011b chemick\u00e9 v\u00fdroby, v\u00fdroby pap\u00edru a komponent\u016f pro \u010derpadla a pohonn\u00e9 syst\u00e9my. Nav\u00edc dynamick\u00e9 t\u011bsnic\u00ed technologie vyu\u017e\u00edvaj\u00edc\u00ed t\u0159ec\u00ed lo\u017eiska nebo mechanick\u00e9 ucp\u00e1vky mu \u010dasto d\u00e1vaj\u00ed p\u0159ednost p\u0159ed kovov\u00fdmi prot\u011bj\u0161ky pro jejich vy\u0161\u0161\u00ed spolehlivost v n\u00e1ro\u010dn\u00fdch podm\u00ednk\u00e1ch.<\/p>\n
Nejpou\u017e\u00edvan\u011bj\u0161\u00edm typem je karbid k\u0159em\u00edku alfa (a-SiC) s hexagon\u00e1ln\u00ed krystalovou strukturou podobnou wurtzitu. A\u010dkoli je k dispozici beta a-SiC s krystalovou strukturou zinc blende, jeho komer\u010dn\u00ed vyu\u017eit\u00ed z\u016fst\u00e1v\u00e1 omezen\u00e9.<\/p>\n
V\u0161estrannost karbidu k\u0159em\u00edku jako materi\u00e1lu vypl\u00fdv\u00e1 p\u0159edev\u0161\u00edm z jeho vynikaj\u00edc\u00edch tepeln\u00fdch vlastnost\u00ed, v\u010detn\u011b vysok\u00e9 tepeln\u00e9 vodivosti, n\u00edzk\u00e9 tepeln\u00e9 rozta\u017enosti a vysok\u00e9ho bodu t\u00e1n\u00ed, d\u00edky nim\u017e je vhodn\u00fd pro aplikace v letectv\u00ed, energetice a chemick\u00e9 v\u00fdrob\u011b.<\/p>\n
Tento materi\u00e1l vynik\u00e1 vynikaj\u00edc\u00ed odolnost\u00ed proti korozi, v\u010detn\u011b odolnosti v\u016f\u010di kyselin\u00e1m a z\u00e1sad\u00e1m a teplot\u00e1m a\u017e do 1600 \u00b0C. Proto je ide\u00e1ln\u00ed volbou pro lo\u017eiska, trysky, sou\u010d\u00e1sti spalovac\u00edch motor\u016f a d\u00edly elektrick\u00fdch vozidel, kter\u00e9 mus\u00ed odol\u00e1vat siln\u00fdm tepeln\u00fdm \u0161ok\u016fm, ani\u017e by praskaly nebo se rozpadaly.<\/p>\n
Spole\u010dnost American Elements nab\u00edz\u00ed \u0161irok\u00fd v\u00fdb\u011br standardn\u00edch a zak\u00e1zkov\u00fdch materi\u00e1l\u016f pro polovodi\u010de, leteck\u00fd a kosmick\u00fd pr\u016fmysl, automobilov\u00fd pr\u016fmysl, obrannou elektroniku, osv\u011btlovac\u00ed techniku a pap\u00edrensk\u00fd pr\u016fmysl. K dispozici jsou vzorky pro v\u00fdzkumn\u00e9 \u00fa\u010dely a kontrolu kvality, p\u0159i\u010dem\u017e je nab\u00edzeno tak\u00e9 makro- a mikrozrnitostn\u00ed t\u0159\u00edd\u011bn\u00ed. A-SiC spole\u010dnosti American Elements je chemicky \u010dist\u00fd s vysokou sypnou hmotnost\u00ed, zat\u00edmco n\u00e1\u0161 proces chemick\u00e9ho \u010di\u0161t\u011bn\u00ed jej pros\u00e9v\u00e1 tak, aby spl\u0148oval specifick\u00e9 velikosti FEPA i normy ACS Reagent Grade.<\/p>\n
Karbid k\u0159em\u00edku se vyzna\u010duje vynikaj\u00edc\u00ed obrobitelnost\u00ed a elektrickou vodivost\u00ed navzdory sv\u00e9 relativn\u011b n\u00edzk\u00e9 hustot\u011b (3,2 g\/cm3) a odolnost\u00ed v\u016f\u010di v\u011bt\u0161in\u011b kyselin, sol\u00ed a z\u00e1sad.<\/p>\n
GaN jako polovodi\u010d se \u0161irok\u00fdm p\u00e1smem vykazuje vysokou tepelnou vodivost a pr\u016fraznost elektrick\u00fdm polem a je tak\u00e9 vynikaj\u00edc\u00edm izolantem.<\/p>\n
Polytipy SiC se v\u00fdrazn\u011b li\u0161\u00ed ve sv\u00fdch z\u00e1kladn\u00edch elektrick\u00fdch vlastnostech, kter\u00e9 jsou d\u00e1ny uspo\u0159\u00e1d\u00e1n\u00edm atom\u016f v jejich krystalov\u00e9 m\u0159\u00ed\u017ece, p\u0159i\u010dem\u017e ka\u017ed\u00fd z nich nab\u00edz\u00ed specifick\u00e9 v\u00fdhody a nev\u00fdhody ve srovn\u00e1n\u00ed s k\u0159em\u00edkem ve t\u0159ech kl\u00ed\u010dov\u00fdch kategori\u00edch - tepeln\u00e1 vodivost, pr\u016fraznost elektrick\u00fdm polem a energetick\u00fd p\u00e1sov\u00fd rozptyl.<\/p>\n
SiC se vyr\u00e1b\u00ed v n\u011bkolika form\u00e1ch. Alfa formy maj\u00ed hexagon\u00e1ln\u00ed krystalovou strukturu podobnou wurtzitu, zat\u00edmco beta formy maj\u00ed krystalovou strukturu zinkov\u00e9ho blende a mohou slou\u017eit tak\u00e9 jako nosi\u010de katalyz\u00e1tor\u016f. Pomoc\u00ed sp\u00e9k\u00e1n\u00ed v jiskrov\u00e9m plazmatu byl vytvo\u0159en nestechiometrick\u00fd SiC obsahuj\u00edc\u00ed p\u0159\u00eddavky C a Si od 1-5mol%, kter\u00fd vykazoval konzistentn\u00ed mikrostrukturu s n\u00edzk\u00fdm elektrick\u00fdm odporem; jeho Seebeck\u016fv koeficient se s rostouc\u00edm mno\u017estv\u00edm C m\u011bnil z n-typu na p-typ, co\u017e nazna\u010duje, \u017ee mezi C a Si se v jeho m\u0159\u00ed\u017ekov\u00e9 struktu\u0159e vytvo\u0159ily pevn\u00e9 roztoky.<\/p>\n
Karbid k\u0159em\u00edku se ve srovn\u00e1n\u00ed s v\u011bt\u0161inou technick\u00e9 keramiky vyzna\u010duje vynikaj\u00edc\u00ed tvrdost\u00ed, ta\u017enost\u00ed a odolnost\u00ed proti korozi a chemick\u00e9mu napaden\u00ed. Jako jedna z nejtvrd\u0161\u00edch dostupn\u00fdch technick\u00fdch keramik odol\u00e1v\u00e1 vysok\u00fdm teplot\u00e1m a mechanick\u00e9mu nam\u00e1h\u00e1n\u00ed a d\u00edky vysok\u00e9 hodnot\u011b Youngova modulu poskytuje dobrou rozm\u011brovou stabilitu.<\/p>\n
Hlin\u00edk je jedn\u00edm z nejstabiln\u011bj\u0161\u00edch materi\u00e1l\u016f v\u016f\u010di n\u00e1raz\u016fm a vibrac\u00edm, co\u017e z n\u011bj \u010din\u00ed vhodn\u00fd materi\u00e1l pro vysoce v\u00fdkonn\u00e9 aplikace, jako jsou brusn\u00e9 materi\u00e1ly a dal\u0161\u00ed high-tech aplikace. Krom\u011b toho je d\u00edky sv\u00e9 tepeln\u00e9 vodivosti, n\u00edzk\u00e9mu koeficientu rozta\u017enosti a odolnosti v\u016f\u010di kyselin\u00e1m a louh\u016fm vynikaj\u00edc\u00ed volbou.<\/p>\n
Spole\u010dnost American Elements nab\u00edz\u00ed v\u00fdb\u011br pr\u00e1\u0161kov\u00fdch produkt\u016f z karbidu k\u0159em\u00edku vysok\u00e9 \u010distoty vyroben\u00fdch podle p\u0159\u00edsn\u00fdch pr\u016fmyslov\u00fdch a aplika\u010dn\u00edch norem pro pou\u017eit\u00ed v mnoha pr\u016fmyslov\u00fdch odv\u011btv\u00edch a aplikac\u00edch, jako je Mil Spec (vojensk\u00e1 jakost), ACS Reagent Grade Technical Grade Food Pharmaceutical Grade a USP\/BP obalov\u00e1 \u0159e\u0161en\u00ed - pro v\u00edce informac\u00ed se pros\u00edm obra\u0165te na n\u00e1\u0161 t\u00fdm; v\u0161echny stupn\u011b spl\u0148uj\u00ed platn\u00e9 testovac\u00ed normy ASTM s mo\u017enost\u00ed vlastn\u00edho balen\u00ed podle pot\u0159eby - typick\u00e1 a vlastn\u00ed balen\u00ed jsou k dispozici na vy\u017e\u00e1d\u00e1n\u00ed - pros\u00edm, obra\u0165te se na n\u00e1s, proto\u017ee spole\u010dnost American Elements se sna\u017e\u00ed nab\u00edzet z\u00e1kazn\u00edk\u016fm kvalitn\u00ed produkty a z\u00e1rove\u0148 poskytovat bezkonkuren\u010dn\u00ed z\u00e1kaznick\u00fd servis!<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide (SiC) is an inorganic chemical compound made of silica and carbon that was first mass produced commercially since […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","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":[3],"tags":[],"class_list":["post-76","post","type-post","status-publish","format-standard","hentry","category-sic-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/posts\/76","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/comments?post=76"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/posts\/76\/revisions"}],"predecessor-version":[{"id":77,"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/posts\/76\/revisions\/77"}],"wp:attachment":[{"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/media?parent=76"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/categories?post=76"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/cs\/wp-json\/wp\/v2\/tags?post=76"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}