Rekrystalizovan\u00fd karbid k\u0159em\u00edku (RSiC) je vysoce v\u00fdkonn\u00fd keramick\u00fd materi\u00e1l s vynikaj\u00edc\u00edmi mechanick\u00fdmi, tepeln\u00fdmi a elektrick\u00fdmi vlastnostmi. Jeho jedine\u010dn\u00e1 kombinace vlastnost\u00ed z n\u011bj \u010din\u00ed ide\u00e1ln\u00ed materi\u00e1l pro n\u00e1ro\u010dn\u00e9 aplikace v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch, v\u010detn\u011b leteck\u00e9ho, polovodi\u010dov\u00e9ho a automobilov\u00e9ho pr\u016fmyslu. V tomto \u010dl\u00e1nku se budeme zab\u00fdvat vlastnostmi RSiC, jeho v\u00fdrobn\u00edm procesem a jeho aplikacemi v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch.<\/p>\n
Vlastnosti rekrystalizovan\u00e9ho karbidu k\u0159em\u00edku
\nRSiC je keramick\u00fd materi\u00e1l slo\u017een\u00fd z atom\u016f k\u0159em\u00edku a uhl\u00edku v krystalov\u00e9 m\u0159\u00ed\u017ece. Vznik\u00e1 rekrystalizac\u00ed pr\u00e1\u0161kov\u00e9ho karbidu k\u0159em\u00edku p\u0159i vysok\u00fdch teplot\u00e1ch (>2200 \u00b0C) ve vakuu nebo inertn\u00ed atmosf\u00e9\u0159e. V\u00fdsledn\u00fd materi\u00e1l m\u00e1 hustotu 2,6 g\/cm\u00b3, p\u00f3rovitost men\u0161\u00ed ne\u017e 1% a vysok\u00fd stupe\u0148 \u010distoty (>99,5%).<\/p>\n
Mechanick\u00e9 vlastnosti:
\nRSiC m\u00e1 vynikaj\u00edc\u00ed mechanick\u00e9 vlastnosti, v\u010detn\u011b vysok\u00e9 pevnosti, hou\u017eevnatosti a tvrdosti. Jeho Young\u016fv modul je p\u0159ibli\u017en\u011b 400 GPa, co\u017e je v\u00edce ne\u017e u oceli, a jeho lomov\u00e1 hou\u017eevnatost je p\u0159ibli\u017en\u011b 4,5 MPa.m^0,5, co\u017e je v\u00edce ne\u017e u v\u011bt\u0161iny keramik. Jej\u00ed tvrdost se pohybuje kolem 2400 Vickersov\u00fdch stup\u0148\u016f, co\u017e z n\u00ed \u010din\u00ed jednu z nejtvrd\u0161\u00edch zn\u00e1m\u00fdch keramik.<\/p>\n
Tepeln\u00e9 vlastnosti:
\nMateri\u00e1l RSiC m\u00e1 vynikaj\u00edc\u00ed tepeln\u00e9 vlastnosti, v\u010detn\u011b vysok\u00e9 tepeln\u00e9 vodivosti, n\u00edzk\u00e9 tepeln\u00e9 rozta\u017enosti a vynikaj\u00edc\u00ed odolnosti proti tepeln\u00fdm \u0161ok\u016fm. Jeho tepeln\u00e1 vodivost se pohybuje kolem 100-150 W\/m.K, co\u017e je v\u00edce ne\u017e u v\u011bt\u0161iny keramik a srovnateln\u00e9 s kovy. Jej\u00ed koeficient tepeln\u00e9 rozta\u017enosti je p\u0159ibli\u017en\u011b 4,5 x 10^-6\/K, co\u017e je ve srovn\u00e1n\u00ed s jin\u00fdmi keramikami n\u00edzk\u00e1 hodnota. Jeho odolnost proti tepeln\u00fdm \u0161ok\u016fm se p\u0159isuzuje vysok\u00e9 tepeln\u00e9 vodivosti a n\u00edzk\u00e9 tepeln\u00e9 rozta\u017enosti.<\/p>\n
Elektrick\u00e9 vlastnosti:
\nRSiC m\u00e1 dobr\u00e9 elektrick\u00e9 vlastnosti, v\u010detn\u011b vysok\u00e9ho elektrick\u00e9ho odporu a n\u00edzk\u00fdch dielektrick\u00fdch ztr\u00e1t. Jeho elektrick\u00fd odpor se p\u0159i pokojov\u00e9 teplot\u011b pohybuje kolem 5 x 10^6 \u03a9.cm, co\u017e z n\u011bj \u010din\u00ed vynikaj\u00edc\u00ed izola\u010dn\u00ed materi\u00e1l. Jeho dielektrick\u00e9 ztr\u00e1ty jsou men\u0161\u00ed ne\u017e 0,01 p\u0159i frekvenc\u00edch do 1 MHz, co\u017e jej \u010din\u00ed vhodn\u00fdm pro vysokofrekven\u010dn\u00ed aplikace.<\/p>\n
V\u00fdrobn\u00ed proces rekrystalizovan\u00e9ho karbidu k\u0159em\u00edku:
\nV\u00fdrobn\u00ed proces RSiC zahrnuje n\u011bkolik krok\u016f, v\u010detn\u011b:<\/p>\n
V\u00fdroba zelen\u00e9 karoserie: Karbid k\u0159em\u00edku se sm\u00edch\u00e1 s pojivem a jednoos\u00fdm nebo izostatick\u00fdm lisov\u00e1n\u00edm se zformuje do zelen\u00e9ho t\u011blesa.<\/p>\n
P\u0159edsp\u00e9k\u00e1n\u00ed: Zelen\u00e9 t\u011bleso se p\u0159edsp\u00e9k\u00e1 p\u0159i teplot\u011b p\u0159ibli\u017en\u011b 1650 \u00b0C, aby z\u00edskalo dostate\u010dnou pevnost a tuhost pro manipulaci.<\/p>\n
Tvarov\u00e1n\u00ed: P\u0159edsintrovan\u00e9 zelen\u00e9 t\u011bleso se opracov\u00e1v\u00e1 do po\u017eadovan\u00e9ho tvaru r\u016fzn\u00fdmi technikami, jako je \u0159ez\u00e1n\u00ed, brou\u0161en\u00ed a fr\u00e9zov\u00e1n\u00ed.<\/p>\n
Kone\u010dn\u00e9 sp\u00e9k\u00e1n\u00ed: Obroben\u00e9 zelen\u00e9 t\u011bleso se zah\u0159eje na teplotu > 2200 \u00b0C ve vakuu nebo inertn\u00ed atmosf\u00e9\u0159e, aby do\u0161lo k rekrystalizaci pr\u00e1\u0161kov\u00e9ho karbidu k\u0159em\u00edku, \u010d\u00edm\u017e vznikne hust\u00fd a \u010dist\u00fd materi\u00e1l RSiC.<\/p>\n
Aplikace rekrystalizovan\u00e9ho karbidu k\u0159em\u00edku:
\nRSiC m\u00e1 \u0161irokou \u0161k\u00e1lu aplikac\u00ed v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch, v\u010detn\u011b:<\/p>\n
Letectv\u00ed a kosmonautika: RSiC se pou\u017e\u00edv\u00e1 jako lehk\u00fd a vysoce pevn\u00fd materi\u00e1l v leteck\u00fdch konstrukc\u00edch, jako jsou lopatky turb\u00edn, trysky raket a tepeln\u00e9 \u0161t\u00edty.<\/p>\n
Polovodi\u010de: RSiC se pou\u017e\u00edv\u00e1 jako kel\u00edmkov\u00fd materi\u00e1l pro v\u00fdrobu k\u0159em\u00edkov\u00fdch desti\u010dek a jako substr\u00e1tov\u00fd materi\u00e1l pro r\u016fst vrstev nitridu galia (GaN).<\/p>\n
Automobilov\u00fd pr\u016fmysl: RSiC se pou\u017e\u00edv\u00e1 jako materi\u00e1l brzdov\u00fdch kotou\u010d\u016f d\u00edky sv\u00e9 vysok\u00e9 tepeln\u00e9 vodivosti a n\u00edzk\u00e9 tepeln\u00e9 rozta\u017enosti.<\/p>\n
Chemick\u00e9 l\u00e1tky: RSiC se pou\u017e\u00edv\u00e1 jako vyzd\u00edvka vysokoteplotn\u00edch pec\u00ed a reaktor\u016f v chemick\u00e9m pr\u016fmyslu.<\/p>\n
Z\u00e1v\u011br:
\nRekrystalizovan\u00fd karbid k\u0159em\u00edku je vysoce v\u00fdkonn\u00fd keramick\u00fd materi\u00e1l s vynikaj\u00edc\u00edmi mechanick\u00fdmi, tepeln\u00fdmi a elektrick\u00fdmi vlastnostmi. Jeho jedine\u010dn\u00e1 kombinace vlastnost\u00ed z n\u011bj \u010din\u00ed ide\u00e1ln\u00ed materi\u00e1l pro n\u00e1ro\u010dn\u00e9 aplikace v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch, v\u010detn\u011b leteck\u00e9ho, polovodi\u010dov\u00e9ho a automobilov\u00e9ho pr\u016fmyslu. Jeho v\u00fdrobn\u00ed proces zahrnuje n\u011bkolik krok\u016f, v\u010detn\u011b v\u00fdroby zelen\u00e9ho t\u011blesa, p\u0159edsp\u00e9k\u00e1n\u00ed, tvarov\u00e1n\u00ed a kone\u010dn\u00e9ho sp\u00e9k\u00e1n\u00ed. Celkov\u011b je RSiC v\u0161estrann\u00fd materi\u00e1l, kter\u00fd m\u00e1 potenci\u00e1l zp\u016fsobit revoluci v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch a vydl\u00e1\u017edit cestu nov\u00fdm technologi\u00edm.<\/p>","protected":false},"excerpt":{"rendered":"
Rekrystalizovan\u00fd karbid k\u0159em\u00edku: Karbid k\u0159em\u00edku (RSiC) je vysoce v\u00fdkonn\u00fd keramick\u00fd materi\u00e1l s vynikaj\u00edc\u00edmi mechanick\u00fdmi, tepeln\u00fdmi a elektrick\u00fdmi vlastnostmi. Jeho jedine\u010dn\u00e1 kombinace vlastnost\u00ed z n\u011bj \u010din\u00ed ide\u00e1ln\u00ed materi\u00e1l pro n\u00e1ro\u010dn\u00e9 aplikace v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch, v\u010detn\u011b leteck\u00e9ho, polovodi\u010dov\u00e9ho a automobilov\u00e9ho pr\u016fmyslu. V tomto \u010dl\u00e1nku se budeme zab\u00fdvat vlastnostmi tohoto materi\u00e1lu a jeho [...]<\/p>","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":"default","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":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","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-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[2],"tags":[],"class_list":["post-30","post","type-post","status-publish","format-standard","hentry","category-product-related"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/posts\/30","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/comments?post=30"}],"version-history":[{"count":1,"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/posts\/30\/revisions"}],"predecessor-version":[{"id":31,"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/posts\/30\/revisions\/31"}],"wp:attachment":[{"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/media?parent=30"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/categories?post=30"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mavigard.com\/cs\/wp-json\/wp\/v2\/tags?post=30"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}