Karbid k\u0159em\u00edku (SiC) je inertn\u00ed, tvrd\u00fd keramick\u00fd materi\u00e1l s vynikaj\u00edc\u00edmi fyzik\u00e1ln\u00edmi vlastnostmi. D\u00edky sv\u00e9 tvrdosti se pou\u017e\u00edv\u00e1 v \u017e\u00e1ruvzdorn\u00fdch materi\u00e1lech a abrazivech a tak\u00e9 ve vysokoteplotn\u00edch aplikac\u00edch, kde je nejd\u016fle\u017eit\u011bj\u0161\u00ed tepeln\u00e1 stabilita a odolnost proti opot\u0159eben\u00ed.<\/p>\n
Pouze diamant a karbid boru jsou tvrd\u0161\u00ed ne\u017e SiC. P\u0159i vysok\u00e9 \u010distot\u011b se SiC m\u016f\u017ee jevit jako bezbarv\u00fd, v opa\u010dn\u00e9m p\u0159\u00edpad\u011b m\u016f\u017ee p\u0159i v\u00fdrob\u011b Lelyho metodou nab\u00fdvat \u010dern\u00fdch odst\u00edn\u016f.<\/p>\n
Karbid k\u0159em\u00edku - \u010dast\u011bji ozna\u010dovan\u00fd jako karborundum - je mimo\u0159\u00e1dn\u011b tvrd\u00e1 chemick\u00e1 slou\u010denina slo\u017een\u00e1 z k\u0159em\u00edku a uhl\u00edku, kter\u00e1 se v p\u0159\u00edrod\u011b vyskytuje pouze p\u0159\u00edle\u017eitostn\u011b jako moissanit; od konce 19. stolet\u00ed se v\u0161ak masov\u011b vyr\u00e1b\u00ed jak ve form\u011b pr\u00e1\u0161ku, tak krystal\u016f.<\/p>\n
\u010cern\u00fd karbid k\u0159em\u00edku (SiC) se \u010dasto pou\u017e\u00edv\u00e1 v abrazivech d\u00edky sv\u00e9 tvrdosti a odolnosti proti opot\u0159eben\u00ed. Krom\u011b toho lze SiC nal\u00e9zt tak\u00e9 jako sou\u010d\u00e1st \u017e\u00e1ruvzdorn\u00fdch vyzd\u00edvek, topn\u00fdch t\u011bles\/topn\u00fdch prvk\u016f\/\u0159ezn\u00fdch n\u00e1stroj\u016f\/ a polovodi\u010dov\u00fdch substr\u00e1t\u016f pou\u017e\u00edvan\u00fdch v LED diod\u00e1ch a energetick\u00fdch za\u0159\u00edzen\u00edch.<\/p>\n
Karbid k\u0159em\u00edku s nitridovou vazbou (NB SiC) se vyr\u00e1b\u00ed procesem zvan\u00fdm nitridace, p\u0159i n\u011bm\u017e se surov\u00e1 zrna SiC zah\u0159\u00edvaj\u00ed a m\u00eds\u00ed se slou\u010deninami obsahuj\u00edc\u00edmi dus\u00edk za vzniku hust\u00e9ho a mechanicky pevn\u00e9ho kompozitn\u00edho materi\u00e1lu. Tato forma karbidu k\u0159em\u00edku m\u00e1 nav\u00edc vynikaj\u00edc\u00ed odolnost proti tepeln\u00fdm \u0161ok\u016fm, co\u017e mu umo\u017e\u0148uje odol\u00e1vat rychl\u00fdm zm\u011bn\u00e1m teploty, ani\u017e by \u010dasem praskal nebo se rozpadal.<\/p>\n
Karbid k\u0159em\u00edku je jedn\u00edm z nejpevn\u011bj\u0161\u00edch neoxidov\u00fdch keramick\u00fdch materi\u00e1l\u016f, kter\u00fd se m\u016f\u017ee pochlubit mimo\u0159\u00e1dn\u011b tvrdou tvrdost\u00ed Knoop mezi diamantem a kubick\u00fdm nitridem b\u00f3ru, co\u017e zaru\u010duje dlouhodobou odolnost proti opot\u0159eben\u00ed a trh\u00e1n\u00ed a pevnost, kter\u00e1 odol\u00e1v\u00e1 extr\u00e9mn\u00edm teplot\u00e1m a nam\u00e1h\u00e1n\u00ed.<\/p>\n
\u010cern\u00fd pr\u00e1\u0161ek SiC je \u0161iroce vyu\u017e\u00edv\u00e1n v automobilov\u00e9m a leteck\u00e9m pr\u016fmyslu k brou\u0161en\u00ed, le\u0161t\u011bn\u00ed a lapov\u00e1n\u00ed kovov\u00fdch a keramick\u00fdch d\u00edl\u016f na p\u0159esn\u00e9 rozm\u011bry s hladk\u00fdm povrchem. D\u00edky sv\u00e9 vy\u0161\u0161\u00ed pevnosti ne\u017e diamant je toto brusivo \u010dasto voleno m\u00edsto sv\u00e9ho konkurenta.<\/p>\n
Reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku (RB SiC) se vyr\u00e1b\u00ed vst\u0159ikov\u00e1n\u00edm roztaven\u00e9ho k\u0159em\u00edku do por\u00e9zn\u00edho uhl\u00edkov\u00e9ho materi\u00e1lu tvarovan\u00e9ho do po\u017eadovan\u00e9ho tvaru d\u00edlu, \u010d\u00edm\u017e vznik\u00e1 vysoce v\u00fdkonn\u00e1, chemicky odoln\u00e1 struktur\u00e1ln\u00ed keramika s n\u00edzk\u00fdm koeficientem tepeln\u00e9 rozta\u017enosti. RB SiC lze nal\u00e9zt v \u010derpadlech a mechanick\u00fdch t\u011bsn\u011bn\u00edch, lo\u017eisk\u00e1ch a v\u011bt\u0161\u00edch opot\u0159ebiteln\u00fdch sou\u010d\u00e1stech.<\/p>\n
Karbid k\u0159em\u00edku je jednou ze t\u0159\u00ed nejtvrd\u0161\u00edch l\u00e1tek na Zemi, hned po diamantu a karbidu boru. D\u00edky t\u00e9to neuv\u011b\u0159iteln\u00e9 tvrdosti odol\u00e1v\u00e1 karbid k\u0159em\u00edku extr\u00e9mn\u00edmu tlaku i mechanick\u00e9mu nam\u00e1h\u00e1n\u00ed, tak\u017ee je vhodn\u00fd pro leteck\u00e9 a kosmick\u00e9 komponenty, automobilov\u00e9 aplikace a \u0159ezn\u00e9 n\u00e1stroje.<\/p>\n
Vysoce v\u00fdkonn\u00e1 keramika je vysoce odoln\u00e1 proti korozi a opot\u0159eben\u00ed a odol\u00e1v\u00e1 rychl\u00fdm zm\u011bn\u00e1m teploty, ani\u017e by praskala nebo se deformovala. Krom\u011b toho ji lze zpracov\u00e1vat na funk\u010dn\u00ed keramiku, pokro\u010dil\u00e9 \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly a dokonce i na brusiva pro pou\u017eit\u00ed.<\/p>\n
\u010cern\u00fd pr\u00e1\u0161kov\u00fd karbid k\u0159em\u00edku (SiCp) je z\u00e1kladn\u00edm n\u00e1strojem p\u0159i honov\u00e1n\u00ed, lapov\u00e1n\u00ed a le\u0161t\u011bn\u00ed kov\u016f, keramiky a skla pro dosa\u017een\u00ed p\u0159esn\u00fdch rozm\u011br\u016f a hladk\u00fdch povrch\u016f. Krom\u011b toho, \u017ee se SiC pou\u017e\u00edv\u00e1 jako brusn\u00fd materi\u00e1l, m\u016f\u017ee slou\u017eit tak\u00e9 jako antioxidant p\u0159i v\u00fdrob\u011b oceli a ve sl\u00e9v\u00e1rn\u00e1ch a jako materi\u00e1l odoln\u00fd v\u016f\u010di vysok\u00fdm teplot\u00e1m ve sl\u00e9v\u00e1rn\u00e1ch. Mezi dal\u0161\u00ed odr\u016fdy SiC pat\u0159\u00ed nitridov\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku (NB SiC) a slinut\u00fd reak\u010dn\u011b v\u00e1zan\u00fd nitrid karbidu k\u0159em\u00edku (SRBSN); tyto procesy vyr\u00e1b\u011bj\u00ed SRBSN zah\u0159\u00edv\u00e1n\u00edm v odporov\u00e9 peci.<\/p>\n
Karbid k\u0159em\u00edku je ide\u00e1ln\u00ed volbou materi\u00e1lu pro aplikace, kter\u00e9 vy\u017eaduj\u00ed extr\u00e9mn\u00ed odolnost a tvrdost, jako jsou nap\u0159\u00edklad brzdy automobil\u016f nebo keramick\u00e9 desti\u010dky v nepr\u016fst\u0159eln\u00fdch vest\u00e1ch. Krom\u011b toho m\u00e1 tento materi\u00e1l vynikaj\u00edc\u00ed chemick\u00e9 vlastnosti a odol\u00e1v\u00e1 i vysok\u00fdm teplot\u00e1m, ani\u017e by se roztavil.<\/p>\n
Moissanit je jedn\u00edm z nejtvrd\u0161\u00edch syntetick\u00fdch materi\u00e1l\u016f, jeho tvrdost je srovnateln\u00e1 s tvrdost\u00ed diamantu a podle Mohsovy stupnice dosahuje hodnoty 9. V p\u0159\u00edrod\u011b se sice vyskytuje jako vz\u00e1cn\u00fd miner\u00e1l moissanit, ale p\u0159i hromadn\u00e9 v\u00fdrob\u011b t\u00e9to tvrd\u00e9 syntetick\u00e9 l\u00e1tky se vyu\u017e\u00edv\u00e1 pr\u00e1\u0161kov\u00fd k\u0159em\u00edk a uhl\u00edk v procesu sp\u00e9k\u00e1n\u00ed.<\/p>\n
Karbid k\u0159em\u00edku zvy\u0161uje pevnost \u017e\u00edh\u00e1n\u00edm v d\u016fsledku vod\u00edkov\u00e9 vazby nepol\u00e1rn\u00edch povrch\u016f a je u\u017eite\u010dn\u00fd jako dezoxid\u00e1tor p\u0159i v\u00fdrob\u011b oceli, proto\u017ee podporuje nauhli\u010dov\u00e1n\u00ed a zvy\u0161uje m\u00edru regenerace prvk\u016f slitiny. D\u00edky sv\u00e9 tepeln\u00e9 stabilit\u011b a chemick\u00e9 inertnosti zaru\u010duj\u00ed komponenty z karbidu k\u0159em\u00edku pro za\u0159\u00edzen\u00ed na zpracov\u00e1n\u00ed polovodi\u010dov\u00fdch desti\u010dek spolehliv\u00fd v\u00fdkon i v prost\u0159ed\u00ed s vysok\u00fdmi teplotami.<\/p>\n
Pr\u00e1\u0161ky karbidu k\u0159em\u00edku nab\u00edzej\u00ed ide\u00e1ln\u00ed kombinaci tvrdosti a vodivosti p\u0159i pou\u017eit\u00ed jako abraziva nebo v keramick\u00fdch sou\u010d\u00e1stech odoln\u00fdch proti ot\u011bru a tak\u00e9 p\u0159i spojov\u00e1n\u00ed slinov\u00e1n\u00edm pro vytv\u00e1\u0159en\u00ed vysoce v\u00fdkonn\u00fdch pr\u016fmyslov\u00fdch keramick\u00fdch v\u00fdrobk\u016f.<\/p>\n
Karbid k\u0159em\u00edku se stal jedn\u00edm z nejvyhled\u00e1van\u011bj\u0161\u00edch keramick\u00fdch materi\u00e1l\u016f sou\u010dasnosti d\u00edky sv\u00fdm pozoruhodn\u00fdm vlastnostem, kter\u00e9 sahaj\u00ed od extr\u00e9mn\u00ed trvanlivosti a odolnosti proti korozi a\u017e po tepelnou stabilitu a tepelnou odolnost - vlastnosti, kter\u00e9 ho posunuly mezi hlavn\u00ed volby pro brzdov\u00e9 desti\u010dky automobil\u016f a desti\u010dky nepr\u016fst\u0159eln\u00fdch vest. Karbid k\u0159em\u00edku poskytuje pevnost i tepelnou odolnost.<\/p>","protected":false},"excerpt":{"rendered":"
Karbid k\u0159em\u00edku v pr\u00e1\u0161ku Revoluce v pevnosti keramiky Karbid k\u0159em\u00edku (SiC) je inertn\u00ed, tvrd\u00fd keramick\u00fd materi\u00e1l s vynikaj\u00edc\u00edmi fyzik\u00e1ln\u00edmi vlastnostmi. D\u00edky sv\u00e9 tvrdosti se pou\u017e\u00edv\u00e1 v \u017e\u00e1ruvzdorn\u00fdch materi\u00e1lech a abrazivech a tak\u00e9 ve vysokoteplotn\u00edch aplikac\u00edch, kde je nejd\u016fle\u017eit\u011bj\u0161\u00ed tepeln\u00e1 stabilita a odolnost proti opot\u0159eben\u00ed. Tvrd\u0161\u00ed ne\u017e SiC je pouze diamant a karbid boru. P\u0159i vysok\u00e9 \u010distot\u011b je ... \u010c\u00edst d\u00e1l<\/a><\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-69","post","type-post","status-publish","format-standard","hentry","category-product"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/posts\/69","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/comments?post=69"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/posts\/69\/revisions"}],"predecessor-version":[{"id":70,"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/posts\/69\/revisions\/70"}],"wp:attachment":[{"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/media?parent=69"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/categories?post=69"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbidepowders.com\/cs\/wp-json\/wp\/v2\/tags?post=69"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}