Rekrystalizovan\u00fd karbid k\u0159em\u00edku (RSiC) se vyzna\u010duje v\u00fdjime\u010dnou pevnost\u00ed p\u0159i vysok\u00fdch teplot\u00e1ch a odolnost\u00ed proti ot\u011bru, co\u017e z n\u011bj \u010din\u00ed materi\u00e1l vhodn\u00fd pro celou \u0159adu aplikac\u00ed. D\u00edky sv\u00e9 jedine\u010dn\u00e9 mikrostruktu\u0159e p\u0159ekon\u00e1v\u00e1 rekrystalizovan\u00fd SiC z hlediska tepeln\u00fdch, mechanick\u00fdch a chemick\u00fdch vlastnost\u00ed reak\u010dn\u011b slinut\u00fd nebo beztlakov\u011b slinut\u00fd SiC.<\/p>\n
RSiC se vyr\u00e1b\u00ed odl\u00e9v\u00e1n\u00edm, vytla\u010dov\u00e1n\u00edm nebo vst\u0159ikov\u00e1n\u00edm a n\u00e1sledn\u011b se zah\u0159\u00edv\u00e1 na vysokou teplotu.<\/p>\n
Karbid k\u0159em\u00edku je extr\u00e9mn\u011b tvrd\u00e1 a odoln\u00e1 keramika s vynikaj\u00edc\u00edmi mechanick\u00fdmi vlastnostmi a vysokou odolnost\u00ed proti korozi, d\u00edky \u010demu\u017e je \u0161iroce pou\u017eiteln\u00e1 v leteck\u00e9m a vojensk\u00e9m pr\u016fmyslu a v dal\u0161\u00edch oborech pro zv\u00fd\u0161en\u00ed v\u00fdkonu za\u0159\u00edzen\u00ed a zlep\u0161en\u00ed jeho pou\u017e\u00edv\u00e1n\u00ed.<\/p>\n
Rekrystalizovan\u00fd karbid k\u0159em\u00edku (RSiC) vykazuje na rozd\u00edl od v\u011bt\u0161iny keramiky SiC minim\u00e1ln\u00ed smr\u0161t\u011bn\u00ed b\u011bhem sp\u00e9k\u00e1n\u00ed a lze jej tvarovat do mnoha geometrick\u00fdch tvar\u016f. Krom\u011b toho z\u016fst\u00e1v\u00e1 jeho pevnost prakticky konstantn\u00ed i p\u0159i velmi vysok\u00fdch teplot\u00e1ch, p\u0159i\u010dem\u017e odol\u00e1v\u00e1 obrovsk\u00e9mu zat\u00ed\u017een\u00ed.<\/p>\n
RSiC lze vyrobit r\u016fzn\u00fdmi v\u00fdrobn\u00edmi technikami, v\u010detn\u011b kluzn\u00e9ho lit\u00ed, vytla\u010dov\u00e1n\u00ed a vst\u0159ikov\u00e1n\u00ed. D\u00edky sv\u00e9 vynikaj\u00edc\u00ed tepeln\u00e9 vodivosti a odolnosti proti oxida\u010dn\u00ed korozi tepeln\u00fdm \u0161ok\u016fm a pevnosti za tepla je ide\u00e1ln\u00ed pro r\u016fzn\u00e9 aplikace v pec\u00edch od jednoduch\u00fdch ty\u010d\u00ed a\u017e po slo\u017eit\u00e9 konstruk\u010dn\u00ed kusy - dokonce p\u0159ekon\u00e1v\u00e1 nitridov\u00e9 SiC \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly s oxidovou vazbou!<\/p>\n
Rekrystalizovan\u00fd karbid k\u0159em\u00edku je inertn\u00ed por\u00e9zn\u00ed slinut\u00e1 keramika s vynikaj\u00edc\u00edmi komplexn\u00edmi vlastnostmi, kter\u00e1 na\u0161la uplatn\u011bn\u00ed v mnoha oborech, jako je nap\u0159\u00edklad n\u00e1bytek do pec\u00ed, m\u00e9dia do plynov\u00fdch ho\u0159\u00e1k\u016f a filtry pevn\u00fdch \u010d\u00e1stic. D\u00edky sv\u00e9 vynikaj\u00edc\u00ed vysokoteplotn\u00ed tuhosti a odolnosti proti korozi je rekrystalizovan\u00fd karbid k\u0159em\u00edku vynikaj\u00edc\u00edm konstruk\u010dn\u00edm materi\u00e1lem vhodn\u00fdm do prost\u0159ed\u00ed s vysokou teplotou.<\/p>\n
Odolnost proti korozi z\u00e1vis\u00ed na n\u011bkolika faktorech, v\u010detn\u011b chemick\u00e9ho prost\u0159ed\u00ed, v n\u011bm\u017e doch\u00e1z\u00ed k napaden\u00ed, a na po\u0159ad\u00ed reakc\u00ed v oxidov\u00e9 vrstv\u011b materi\u00e1lu. Mechanick\u00e9 nam\u00e1h\u00e1n\u00ed m\u016f\u017ee tuto stabilitu oxidov\u00e9 vrstvy zm\u011bnit. Mal\u00e9 mno\u017estv\u00ed yttria, hafnia a kov\u016f vz\u00e1cn\u00fdch zemin m\u016f\u017ee zlep\u0161it odolnost proti cyklick\u00e9 oxidaci, odolnost proti erozi a korozi a odolnost proti odlupov\u00e1n\u00ed oxid\u016f.<\/p>\n
Rekrystalizovan\u00fd karbid k\u0159em\u00edku nab\u00edz\u00ed nejen vysokou pevnost, ale tak\u00e9 velmi n\u00edzk\u00e9 smr\u0161t\u011bn\u00ed. D\u00edky tomu lze vyr\u00e1b\u011bt velk\u00e9 d\u00edly s p\u0159esn\u00fdmi rozm\u011bry bez vnit\u0159n\u00edho pnut\u00ed nebo probl\u00e9m\u016f s povrchovou koroz\u00ed. P\u0159iveden\u00edm nap\u011bt\u00ed na jeho povrch se m\u016f\u017ee st\u00e1t antikorozn\u00ed vrstvou, ani\u017e by pot\u0159eboval speci\u00e1ln\u00ed zdroje energie; m\u00edsto toho vrstva generuje dostatek tepla, aby \u00fa\u010dinn\u011b zni\u010dila sv\u016fj zdroj koroze.<\/p>\n
Slinut\u00fd karbid k\u0159em\u00edku se od v\u011bt\u0161iny keramiky li\u0161\u00ed vysokou tepelnou vodivost\u00ed a n\u00edzkou hustotou, co\u017e z n\u011bj \u010din\u00ed vynikaj\u00edc\u00ed materi\u00e1l pro elektrotechnick\u00e9 aplikace, v\u010detn\u011b chladic\u00edch trubek a ochrann\u00fdch bari\u00e9r. Krom\u011b toho je d\u00edky sv\u00e9 odolnosti v\u016f\u010di vibrac\u00edm a chemik\u00e1li\u00edm vhodn\u00fd pro vibrace motor\u016f i chemick\u00e9 zne\u010di\u0161t\u011bn\u00ed.<\/p>\n
P\u0159i v\u00fdrob\u011b mechanick\u00fdch t\u011bsn\u011bn\u00ed a \u010derpadel se \u010dasto pou\u017e\u00edv\u00e1 chemicky odoln\u00e1 pry\u017e d\u00edky sv\u00e9 mimo\u0159\u00e1dn\u00e9 odolnosti proti opot\u0159eben\u00ed, od\u011bru a korozi. Krom\u011b toho tento materi\u00e1l odol\u00e1 i vysokorychlostn\u00edm st\u0159el\u00e1m, jako jsou kulky a st\u0159epiny vyst\u0159elovan\u00e9 z vozidel, a lze jej nal\u00e9zt i v t\u011bsn\u011bn\u00edch dieselov\u00fdch motor\u016f automobil\u016f. Tento v\u0161estrann\u00fd materi\u00e1l se d\u00edky sv\u00e9 odolnosti v\u016f\u010di chemik\u00e1li\u00edm a opot\u0159eben\u00ed pou\u017e\u00edv\u00e1 tak\u00e9 u trysek a ventil\u016f.<\/p>\n
Materi\u00e1l RSiC se od tradi\u010dn\u00edch \u017e\u00e1ruvzdorn\u00fdch materi\u00e1l\u016f odli\u0161uje \u0159adou v\u00fdjime\u010dn\u00fdch vlastnost\u00ed, jako je vysok\u00e1 pevnost nitridov\u00e9 vazby, n\u00edzk\u00e1 tepeln\u00e1 rozta\u017enost a \u010dist\u00e9 rozhran\u00ed. Krom\u011b toho je v\u00fdroba jednoduch\u00e1, proto\u017ee RSiC lze snadno tvarovat do r\u016fzn\u00fdch tvar\u016f.<\/p>\n
Vysok\u00e1 tepeln\u00e1 vodivost a n\u00edzk\u00e1 tepeln\u00e1 rozta\u017enost karbidu k\u0159em\u00edku mu umo\u017e\u0148uj\u00ed odol\u00e1vat tepeln\u00fdm \u0161ok\u016fm zp\u016fsoben\u00fdm polovodi\u010dov\u00fdmi elektronick\u00fdmi za\u0159\u00edzen\u00edmi, \u010d\u00edm\u017e prodlu\u017euj\u00ed jeho \u017eivotnost a umo\u017e\u0148uj\u00ed mu odol\u00e1vat vysok\u00fdm teplot\u00e1m a nap\u011bt\u00edm.<\/p>\n
Karbid k\u0159em\u00edku se po p\u016fsoben\u00ed vody m\u016f\u017ee formovat do dvou polymorf\u016f: alfa (a-SiC) s wurtzitovou krystalovou strukturou a beta (b-SiC) s krystaly zinkov\u00e9ho blanku. Z t\u011bchto dvou forem m\u00e1 beta SiC v\u011bt\u0161\u00ed odolnost proti korozi a oxida\u010dn\u00edm \u00fatok\u016fm, tak\u017ee b-SiC je vhodn\u011bj\u0161\u00ed.<\/p>\n
Odpa\u0159ov\u00e1n\u00edm a konglomerac\u00ed lze z\u00edskat vysoce por\u00e9zn\u00ed keramiku z karbidu k\u0159em\u00edku s otev\u0159en\u00fdmi p\u00f3ry 11%-15% a velikost\u00ed zrn mezi 100 pm a 500 pm, zn\u00e1mou jako RSIC. Tento materi\u00e1l se m\u016f\u017ee pochlubit vynikaj\u00edc\u00edm MOR p\u0159i pokojov\u00e9 teplot\u011b i odolnost\u00ed proti teplotn\u00edmu \u0161oku p\u0159i teplot\u011b 300 stup\u0148\u016f Celsia, n\u00edzk\u00fdm smr\u0161\u0165ov\u00e1n\u00edm b\u011bhem sp\u00e9k\u00e1n\u00ed a tak\u00e9 t\u00edm, \u017ee je pou\u017eiteln\u00fd v r\u016fzn\u00fdch aplikac\u00edch v\u010detn\u011b n\u00e1bytku do pec\u00ed - co\u017e je obrovsk\u00e1 v\u00fdhoda oproti hust\u00fdm materi\u00e1l\u016fm z oxykarbidu k\u0159em\u00edku, kter\u00e9 postr\u00e1daj\u00ed odolnost proti teplotn\u00edm \u0161ok\u016fm a schopnost MOR.<\/p>\n
Rekrystalizovan\u00fd karbid k\u0159em\u00edku vynik\u00e1 jako elektroizola\u010dn\u00ed materi\u00e1l s nep\u0159ekonateln\u00fdmi elektroizola\u010dn\u00edmi vlastnostmi, kter\u00fd odol\u00e1v\u00e1 vysok\u00fdm teplot\u00e1m, ani\u017e by praskal pod tlakem a byl po\u0161kozen koroz\u00ed nebo kyselou koroz\u00ed - ide\u00e1ln\u00ed pro r\u016fzn\u00e1 prost\u0159ed\u00ed. Jeho n\u00edzk\u00e1 tepeln\u00e1 rozta\u017enost mu nav\u00edc umo\u017e\u0148uje odol\u00e1vat lom\u016fm zp\u016fsoben\u00fdm tepeln\u00fdm \u0161okem.<\/p>\n
Sodnov\u00e1penat\u00e9 sklo je ide\u00e1ln\u00edm materi\u00e1lem pro pou\u017eit\u00ed ve vysokoteplotn\u00edch pec\u00edch a za\u0159\u00edzen\u00edch, ve v\u011b\u017e\u00edch sol\u00e1rn\u00edch elektr\u00e1ren pro p\u0159em\u011bnu slune\u010dn\u00edho sv\u011btla na elekt\u0159inu a v dal\u0161\u00edch aplikac\u00edch vy\u017eaduj\u00edc\u00edch vysok\u00e9 teploty.<\/p>\n
Odl\u00e9v\u00e1n\u00ed, vytla\u010dov\u00e1n\u00ed a vst\u0159ikov\u00e1n\u00ed jsou t\u0159i z\u00e1kladn\u00ed zp\u016fsoby v\u00fdroby RSiC. Vst\u0159ikov\u00e1n\u00ed se v\u0161ak stalo preferovanou metodou d\u00edky sv\u00e9 n\u00e1kladov\u00e9 efektivit\u011b a \u00fa\u010dinnosti; vst\u0159ikovan\u00e9 RSiC v\u0161ak b\u00fdvaj\u00ed po vytvo\u0159en\u00ed slab\u00e9 a por\u00e9zn\u00ed, co\u017e zhor\u0161uje jejich vlastnosti; proto byl vyvinut cyklick\u00fd proces polymern\u00ed impregnace a pyrol\u00fdzy (PIP) s n\u00e1slednou rekrystalizac\u00ed jako \u0159e\u0161en\u00ed, kter\u00e9 zvy\u0161uje pevnost v ohybu a z\u00e1rove\u0148 sni\u017euje por\u00e9znost komer\u010dn\u00edch v\u00fdrobk\u016f RSiC.<\/p>\n
Karbid k\u0159em\u00edku m\u00e1 d\u00edky sv\u00e9 pevnosti, tvrdosti a odolnosti proti korozi mnohostrann\u00e9 vyu\u017eit\u00ed. \u010casto se s n\u00edm setk\u00e1v\u00e1me ve v\u00fdrobc\u00edch, jako jsou brusn\u00e9 kotou\u010de a \u0159ezn\u00e9 n\u00e1stroje pro jejich vysokou pevnost a tvrdost; vysokoteplotn\u00ed kamna a chemick\u00e9 reaktory; ochrann\u00e9 vybaven\u00ed (tankov\u00e9 panc\u00ed\u0159e a nepr\u016fst\u0159eln\u00e9 vesty).<\/p>\n
RSiC lze vytvo\u0159it n\u011bkolika technikami, v\u010detn\u011b kluzn\u00e9ho lit\u00ed, vytla\u010dov\u00e1n\u00ed a vst\u0159ikov\u00e1n\u00ed. Jakmile je vytvo\u0159en, mus\u00ed b\u00fdt slinut p\u0159i vysok\u00fdch teplot\u00e1ch v peci, aby rekrystalizoval a zbavil se pojivov\u00e9ho materi\u00e1lu - d\u00edky tomu je RSiC elektrick\u00fd izolant s vynikaj\u00edc\u00ed dielektrickou pevnost\u00ed vhodn\u00fd pro elektronick\u00e9 aplikace.<\/p>\n
Karborundum (\/karbrnm\/), slitina hlin\u00edku a uhl\u00edku, kter\u00e1 se v p\u0159\u00edrod\u011b vyskytuje jako drahokam moissanit, bylo poprv\u00e9 s\u00e9riov\u011b vyr\u00e1b\u011bno Edwardem Goodrichem Achesonem jako pr\u016fmyslov\u00e1 forma karbidu k\u0159em\u00edku pro pou\u017eit\u00ed v t\u0159ec\u00edch brzd\u00e1ch a keramick\u00fdch desk\u00e1ch nepr\u016fst\u0159eln\u00fdch vest. Karborundum slou\u017e\u00ed tak\u00e9 jako brusivo a tvo\u0159\u00ed z\u00e1klad kol\u00e1\u017eov\u00e9 tiskov\u00e9 drt\u011b; po nanesen\u00ed p\u0159\u00edmo na hlin\u00edkovou desku vytv\u00e1\u0159\u00ed p\u0159i tisku inkoustem stopy.<\/p>","protected":false},"excerpt":{"rendered":"
Recrystallized silicon carbide (RSiC) offers exceptional high-temperature strength and abrasion resistance, making it the go-to material in a range of applications. Thanks to its unique microstructure, recrystallized SiC outshone both reaction sintered or pressureless sintered SiC in terms of thermal, mechanical and chemical properties. RSiC is produced through slip casting, extrusion or injection molding processes […]<\/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-78","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/78","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=78"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/78\/revisions"}],"predecessor-version":[{"id":79,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/78\/revisions\/79"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/media?parent=78"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/categories?post=78"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/tags?post=78"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}