Reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku m\u00e1 d\u00edky sv\u00e9 vynikaj\u00edc\u00ed odolnosti proti opot\u0159eben\u00ed, vysok\u00fdm teplot\u00e1m a korozi \u0159adu aplikac\u00ed. Mezi v\u00fdrobn\u00ed metody reak\u010dn\u00edho lepen\u00ed pat\u0159\u00ed beztlakov\u00e9 slinov\u00e1n\u00ed.<\/p>\n
RB SiC se vyr\u00e1b\u00ed vst\u0159ikov\u00e1n\u00edm roztaven\u00e9ho k\u0159em\u00edku do por\u00e9zn\u00ed uhl\u00edkov\u00e9 nebo grafitov\u00e9 p\u0159edlisku. Po vlo\u017een\u00ed doch\u00e1z\u00ed k jeho interakci s uhl\u00edkem za vzniku hust\u00e9ho t\u011blesa.<\/p>\n
Karbid k\u0159em\u00edku (SiC) je jedn\u00edm z nejtvrd\u0161\u00edch a nejpevn\u011bj\u0161\u00edch materi\u00e1l\u016f, kter\u00e9 \u010dlov\u011bk zn\u00e1, a vyzna\u010duje se vynikaj\u00edc\u00ed odolnost\u00ed proti opot\u0159eben\u00ed a polovi\u010dn\u00ed hmotnost\u00ed oproti oceli. D\u00edky t\u011bmto vlastnostem je fantastick\u00fdm materi\u00e1lem pro opot\u0159ebiteln\u00e9 sou\u010d\u00e1sti, jako jsou t\u011bsn\u011bn\u00ed a lopatky, proto\u017ee odol\u00e1v\u00e1 i extr\u00e9mn\u00edm teplot\u00e1m, ani\u017e by ztratil svou tvrdost nebo se unavil. Reaction Bonded SiC (RBSC), vyr\u00e1b\u011bn\u00fd vst\u0159ikov\u00e1n\u00edm kapaln\u00e9ho k\u0159em\u00edku do por\u00e9zn\u00edch forem uhl\u00edku nebo grafitu p\u0159ed reakc\u00ed s uhl\u00edkem za vzniku karbidu k\u0159em\u00edku, je \u010dasto up\u0159ednost\u0148ov\u00e1n p\u0159ed p\u0159\u00edmo slinut\u00fdm sikem, proto\u017ee poskytuje odolnost proti opot\u0159eben\u00ed i tepeln\u00fdm \u0161ok\u016fm. Reak\u010dn\u011b v\u00e1zan\u00fd SiC (RBSC) naproti tomu nab\u00edz\u00ed dobrou odolnost proti opot\u0159eben\u00ed i tepeln\u00fdm \u0161ok\u016fm ve srovn\u00e1n\u00ed s p\u0159\u00edmo slinut\u00fdm sikem. Oba typy nab\u00edzej\u00ed dobrou odolnost proti opot\u0159eben\u00ed a vlastnosti odolnosti proti tepeln\u00fdm \u0161ok\u016fm i p\u0159i vystaven\u00ed n\u00e1hl\u00e9mu tepeln\u00e9mu \u0161oku.<\/p>\n
Chemick\u00e9 slo\u017een\u00ed a struktura uhl\u00edku v p\u0159edlisc\u00edch a pom\u011br \u010d\u00e1stic SiC k uhl\u00edku ovliv\u0148uj\u00ed mikrostrukturu a vlastnosti RB SC keramiky a poskytuj\u00ed cenn\u00fd pohled na jej\u00ed kone\u010dn\u00e9 f\u00e1zov\u00e9 slo\u017een\u00ed, lomovou hou\u017eevnatost a vlastnosti.<\/p>\n
Reakc\u00ed k\u0159em\u00edkov\u00e9 taveniny s uhl\u00edkem v p\u0159edlisku vznik\u00e1 hust\u00fd a pevn\u00fd kompozitn\u00ed materi\u00e1l SiC-uhl\u00edk odoln\u00fd v\u016f\u010di vysokoteplotn\u00ed korozi, oxidaci, erozivn\u00edmu opot\u0159eben\u00ed a tepeln\u00fdm \u0161ok\u016fm - vynikaj\u00edc\u00ed volba materi\u00e1lu pro aplikace, kde doch\u00e1z\u00ed k rychl\u00fdm zm\u011bn\u00e1m teploty nebo k vysok\u00fdm teplot\u00e1m. Na\u0161e \u0161k\u00e1la velikost\u00ed a stup\u0148\u016f \u010d\u00e1stic n\u00e1m umo\u017e\u0148uje p\u0159izp\u016fsobit jej konkr\u00e9tn\u011b po\u017eadavk\u016fm ka\u017ed\u00e9 aplikace.<\/p>\n
Reak\u010dn\u011b v\u00e1zan\u00e1 keramika z karbidu k\u0159em\u00edku pat\u0159\u00ed mezi nejtvrd\u0161\u00ed technick\u00e9 materi\u00e1ly a poskytuje vynikaj\u00edc\u00ed odolnost proti kluzn\u00e9mu ot\u011bru a opot\u0159eben\u00ed. Jejich extr\u00e9mn\u00ed tvrdost jim umo\u017e\u0148uje odol\u00e1vat vysok\u00fdm teplot\u00e1m s minim\u00e1ln\u00edm po\u0161kozen\u00edm, a to i v p\u0159\u00edpad\u011b, \u017ee jsou vystaveny p\u016fsoben\u00ed agresivn\u00edch chemik\u00e1li\u00ed a zne\u010di\u0161\u0165uj\u00edc\u00edch l\u00e1tek z prost\u0159ed\u00ed.<\/p>\n
V\u00fdroba RBSiC spo\u010d\u00edv\u00e1 v infiltraci roztaven\u00e9ho k\u0159em\u00edku do por\u00e9zn\u00ed uhl\u00edkov\u00e9 nebo grafitov\u00e9 p\u0159edlisku a v reakci s n\u00edm za vzniku SiC a dal\u0161\u00edch vedlej\u0161\u00edch produkt\u016f, kter\u00e9 maj\u00ed u\u017eite\u010dn\u00e9 vyu\u017eit\u00ed. P\u0159i v\u00fdrob\u011b tohoto uhl\u00edku lze pou\u017e\u00edt techniky chemick\u00e9ho napa\u0159ov\u00e1n\u00ed (CVD) a such\u00e9ho lisov\u00e1n\u00ed; po zhutn\u011bn\u00ed poskytuje jeho kone\u010dn\u00fd produkt v\u00fdjime\u010dn\u00e9 chemick\u00e9 a mechanick\u00e9 vlastnosti p\u0159i extr\u00e9mn\u00edch teplot\u00e1ch.<\/p>\n
Techniky zpracov\u00e1n\u00ed keramiky reak\u010dn\u00edmi tv\u00e1\u0159ec\u00edmi metodami zaznamenaly obrovsk\u00fd pokrok a v\u00fdzkumn\u00edci se je neust\u00e1le sna\u017e\u00ed zdokonalovat. Zvl\u00e1\u0161tn\u00ed obavy vzbuzuj\u00ed gelov\u00e9 monomery pou\u017e\u00edvan\u00e9 p\u0159i v\u00fdrob\u011b, proto\u017ee jejich p\u0159\u00edtomnost m\u016f\u017ee vn\u00e1\u0161et ne\u010distoty, kter\u00e9 negativn\u011b m\u011bn\u00ed vlastnosti hotov\u00e9 keramiky; jeden z takov\u00fdch gelov\u00fdch monomer\u016f, zn\u00e1m\u00fd jako akrylamid, m\u00e1 neurotoxick\u00e9 vlastnosti a \u0161patn\u011b reaguje s kysl\u00edkem, co\u017e vede k tvorb\u011b sp\u00e9kan\u00fdch inkluz\u00ed v keramice, kter\u00e1 se s jeho pou\u017eit\u00edm vyr\u00e1b\u00ed. V\u011bdci proto prov\u00e1d\u011bj\u00ed v\u00fdzkum neakrylamidov\u00fdch alternativ, p\u0159i\u010dem\u017e ned\u00e1vn\u00e9 studie uk\u00e1zaly srovnateln\u00e9 v\u00fdsledky dosa\u017een\u00e9 pomoc\u00ed netoxick\u00fdch gelotvorn\u00fdch syst\u00e9m\u016f.<\/p>\n
Karbid k\u0159em\u00edku si zachov\u00e1v\u00e1 svou pevnost a tvrdost i p\u0159i vysok\u00fdch teplot\u00e1ch, co\u017e z n\u011bj \u010din\u00ed vynikaj\u00edc\u00ed materi\u00e1l pro aplikace, kde by rychl\u00e9 zm\u011bny teploty mohly po\u0161kodit nebo znehodnotit jin\u00e9 materi\u00e1ly. Krom\u011b toho se tento materi\u00e1l vyzna\u010duje vynikaj\u00edc\u00ed odolnost\u00ed proti ot\u011bru a ochranou proti korozi, teplu a oxidaci v n\u00e1ro\u010dn\u00fdch podm\u00ednk\u00e1ch - je tedy vhodn\u00fd pro t\u011bsnic\u00ed plochy a vysoce v\u00fdkonn\u00e9 sou\u010d\u00e1sti \u010derpadel.<\/p>\n
Reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku (RB SiC) je mimo\u0159\u00e1dn\u011b odoln\u00fd \u017e\u00e1ruvzdorn\u00fd materi\u00e1l s mimo\u0159\u00e1dn\u011b n\u00edzk\u00fdm obsahem uhl\u00edku, kter\u00fd mu umo\u017e\u0148uje zachovat si pevnost v tahu p\u0159i zv\u00fd\u0161en\u00fdch teplot\u00e1ch a mechanick\u00e9m nam\u00e1h\u00e1n\u00ed, ani\u017e by \u010dasem ztr\u00e1cel pevnost. Jeho tepeln\u011b odoln\u00e9 vlastnosti nav\u00edc umo\u017e\u0148uj\u00ed rychl\u00e9 zm\u011bny teplot, ani\u017e by do\u0161lo k po\u0161kozen\u00ed nebo degradaci jeho integrity.<\/p>\n
RB SiC se vyr\u00e1b\u00ed infiltrac\u00ed por\u00e9zn\u00edch p\u0159edforem slo\u017een\u00fdch ze sm\u011bsi karbidu k\u0159em\u00edku a uhl\u00edku roztaven\u00fdm k\u0159em\u00edkem, n\u00e1slednou reakc\u00ed s uhl\u00edkem za vzniku dal\u0161\u00edch \u010d\u00e1stic karbidu k\u0159em\u00edku, kter\u00e9 se spoj\u00ed s \u010d\u00e1sticemi p\u016fvodn\u011b p\u0159\u00edtomn\u00fdmi v p\u0159edform\u011b a vytvo\u0159\u00ed vynikaj\u00edc\u00ed odolnost proti tepeln\u00fdm \u0161ok\u016fm, odol\u00e1vaj\u00edc\u00ed teplot\u00e1m nad 2000oC. Kone\u010dn\u00fd v\u00fdrobek m\u00e1 vynikaj\u00edc\u00ed odolnost proti tepeln\u00e9mu \u0161oku, co\u017e umo\u017e\u0148uje pou\u017eit\u00ed p\u0159i teplot\u00e1ch p\u0159esahuj\u00edc\u00edch 2000oC.<\/p>\n
Technologie reak\u010dn\u00edho lepen\u00ed vyu\u017e\u00edv\u00e1 proces, p\u0159i kter\u00e9m se nepou\u017e\u00edvaj\u00ed pomocn\u00e9 sp\u00e9kac\u00ed prost\u0159edky, kter\u00e9 do kone\u010dn\u00e9ho produktu vn\u00e1\u0161ej\u00ed ne\u010distoty a mohou zhor\u0161ovat jeho v\u00fdkon. Tento reaktivn\u00ed proces nav\u00edc umo\u017e\u0148uje vyr\u00e1b\u011bt keramiku slo\u017eit\u00fdch tvar\u016f s vysok\u00fdm obsahem SiC - ide\u00e1ln\u00ed pro n\u00e1ro\u010dn\u00e1 prost\u0159ed\u00ed, kde tradi\u010dn\u00ed materi\u00e1ly selh\u00e1vaj\u00ed. Reak\u010dn\u00ed lepen\u00ed m\u00e1 proto mnohostrann\u00e9 vyu\u017eit\u00ed v mnoha pr\u016fmyslov\u00fdch oblastech.<\/p>\n
Reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku (RB SiC) je zn\u00e1m\u00fd svou mimo\u0159\u00e1dnou trvanlivost\u00ed a odolnost\u00ed proti po\u0161kozen\u00ed, stejn\u011b jako vysokou odolnost\u00ed proti korozi, co\u017e z n\u011bj \u010din\u00ed materi\u00e1l pro vysoce v\u00fdkonn\u00e9 aplikace, jako jsou aplikace pro chemickou a teplotn\u00ed stabilitu, mechanick\u00e1 t\u011bsn\u011bn\u00ed a za\u0159\u00edzen\u00ed pro v\u00fdrobu polovodi\u010d\u016f.<\/p>\n
RB SiC se tak\u00e9 m\u016f\u017ee pochlubit v\u00fdjime\u010dnou odolnost\u00ed proti opot\u0159eben\u00ed a tepeln\u00fdm \u0161ok\u016fm, dokonce je schopen odolat intenzivn\u00edmu tlaku atomov\u00e9 bomby! Za tento pozoruhodn\u00fd \u00fasp\u011bch vd\u011b\u010d\u00ed ochrann\u00e9 f\u00e1zi Si3N4, kter\u00e1 p\u016fsob\u00ed jako pojivo a zvy\u0161uje tak lomovou hou\u017eevnatost tohoto materi\u00e1lu.<\/p>\n
V\u00fdroba RB SiC zahrnuje infiltraci roztaven\u00e9ho k\u0159em\u00edku do p\u0159edem p\u0159ipraven\u00fdch por\u00e9zn\u00edch uhl\u00edkov\u00fdch nebo grafitov\u00fdch forem, kter\u00e9 byly zabaleny do tvaru kone\u010dn\u00e9ho produktu, a n\u00e1slednou reakci s uhl\u00edkem za vzniku karbidu k\u0159em\u00edku - podobn\u011b jako se vyr\u00e1b\u00ed slinut\u00fd karbid k\u0159em\u00edku, av\u0161ak levn\u011bji, proto\u017ee nen\u00ed t\u0159eba prov\u00e1d\u011bt kalen\u00ed.<\/p>\n
Reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku se vyzna\u010duje vynikaj\u00edc\u00ed odolnost\u00ed proti korozi a tepeln\u00fdm \u0161ok\u016fm a dod\u00e1v\u00e1 se v r\u016fzn\u00fdch tvarech a velikostech pro v\u00fdrobu. Je \u0161iroce pou\u017e\u00edv\u00e1n v potrubn\u00edch vlo\u017ek\u00e1ch a tlumivk\u00e1ch pro regulaci pr\u016ftoku, stejn\u011b jako ve v\u011bt\u0161\u00edch opot\u0159ebiteln\u00fdch sou\u010d\u00e1stech pou\u017e\u00edvan\u00fdch v d\u016fln\u00edch provozech; krom\u011b toho se z n\u011bj vyr\u00e1b\u011bj\u00ed i p\u0159esn\u00e9 d\u00edly pro plynov\u00e9 spor\u00e1ky.<\/p>","protected":false},"excerpt":{"rendered":"
Reaction bonded silicon carbide has numerous applications due to its superior resistance against wear, high temperature and corrosion. Production methods for reaction bonding include pressureless sintering. RB SiC is manufactured by injecting molten silicon into a porous carbon or graphite preform. Once introduced, it interacts with carbon to form a dense body. High Temperature Strength […]<\/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-96","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/96","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=96"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/96\/revisions"}],"predecessor-version":[{"id":97,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/posts\/96\/revisions\/97"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/media?parent=96"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/categories?post=96"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/cs\/wp-json\/wp\/v2\/tags?post=96"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}