V\u00fdrobci hledaj\u00ed energeticky \u00fa\u010dinn\u011bj\u0161\u00ed motory a cht\u011bj\u00ed nahradit kritick\u00e9 kovy. Tyto motivy iniciovaly v\u00fdvoj r\u016fzn\u00fdch keramick\u00fdch materi\u00e1l\u016f a postup\u016f. Reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku je v\u00fdsledkem t\u011bchto v\u00fdzkum\u016f.Reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku je typ karbidu k\u0159em\u00edku, kter\u00fd se vyr\u00e1b\u00ed chemickou reakc\u00ed mezi grafitem nebo por\u00e9zn\u00edm uhl\u00edkem a roztaven\u00fdm k\u0159em\u00edkem. Materi\u00e1l obsahuje ur\u010dit\u00e9 stopy k\u0159em\u00edku, proto se tak\u00e9 ozna\u010duje jako silikonizovan\u00fd karbid k\u0159em\u00edku. d\u00edky sv\u00fdm vynikaj\u00edc\u00edm vlastnostem odolnosti proti opot\u0159eben\u00ed a chemik\u00e1li\u00edm je ide\u00e1ln\u00ed pro extr\u00e9mn\u00ed prost\u0159ed\u00ed. D\u00edky sv\u00e9 vysok\u00e9 tvrdosti a dobr\u00e9 teplotn\u00ed odolnosti je keramika z karbidu k\u0159em\u00edku vhodn\u00e1 pro r\u016fzn\u00e9 typy aplikac\u00ed, jako jsou opot\u0159ebiteln\u00e9 d\u00edly a axi\u00e1ln\u00ed lo\u017eiska.
\nV t\u00e9to p\u0159\u00edru\u010dce se budeme zab\u00fdvat r\u016fzn\u00fdmi aspekty reak\u010dn\u011b v\u00e1zan\u00fdch karbid\u016f k\u0159em\u00edku, jako jsou jejich kl\u00ed\u010dov\u00e9 vlastnosti a aplikace. D\u00e1le se budeme zab\u00fdvat r\u016fzn\u00fdmi typy reak\u010dn\u011b v\u00e1zan\u00fdch karbid\u016f k\u0159em\u00edku. Za\u010dn\u011bme...<\/p>\n
Zpracov\u00e1n\u00ed reak\u010dn\u011b v\u00e1zan\u00e9ho karbidu k\u0159em\u00edku<\/strong> Jak\u00e9 jsou r\u016fzn\u00e9 typy reak\u010dn\u011b v\u00e1zan\u00e9ho karbidu k\u0159em\u00edku?<\/strong> R\u016fzn\u00e9 vlastnosti karbidu k\u0159em\u00edku<\/strong> R\u016fzn\u00e9 aplikace karbidu k\u0159em\u00edku v\u00e1zan\u00e9ho reakc\u00ed<\/strong> sisic se d\u00edky sv\u00e9 vysok\u00e9 odolnosti proti ot\u011bru hojn\u011b pou\u017e\u00edv\u00e1 v lopatk\u00e1ch \u010derpadel a mechanick\u00fdch ucp\u00e1vk\u00e1ch. Vlastnosti materi\u00e1lu z\u00e1vis\u00ed na obsahu voln\u00e9ho grafitu ve v\u00fdrobku. Reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku se pou\u017e\u00edv\u00e1 jako materi\u00e1l pro nosy t\u011bsn\u011bn\u00ed, kter\u00fd dokonale funguje v nep\u0159\u00edzniv\u00fdch provozn\u00edch prost\u0159ed\u00edch. Manufacturers are looking for more energy-efficient engines and want to replace critical metals. These motives initiated the development of different ceramic materials and processes. Reaction bonded silicon carbide is a result of these investigations.Reaction bonded silicon carbide is a type of silicon carbide that is produced by a chemical reaction between graphite or porous carbon […]<\/p>\n","protected":false},"author":1,"featured_media":280,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[30],"tags":[],"class_list":["post-454","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sic-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/posts\/454","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/comments?post=454"}],"version-history":[{"count":3,"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/posts\/454\/revisions"}],"predecessor-version":[{"id":532,"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/posts\/454\/revisions\/532"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/media\/280"}],"wp:attachment":[{"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/media?parent=454"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/categories?post=454"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbide.net\/cs\/wp-json\/wp\/v2\/tags?post=454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nReak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku se vyr\u00e1b\u00ed sm\u011bs\u00ed karbidu k\u0159em\u00edku a uhl\u00edku s kapaln\u00fdm k\u0159em\u00edkem. Karbid k\u0159em\u00edku se z\u00edsk\u00e1v\u00e1 po reakci mezi k\u0159em\u00edkem a uhl\u00edkem. Zbyl\u00e9 p\u00f3ry po reakci jsou vypln\u011bny k\u0159em\u00edkem. V\u00fdsledkem je hust\u00fd kompozit SiC-Si.
\nRozlo\u017een\u00ed velikosti \u010d\u00e1stic a pom\u011br mezi SIC a uhl\u00edkem se u r\u016fzn\u00fdch v\u00fdrobc\u016f zna\u010dn\u011b li\u0161\u00ed. Proto se vyr\u00e1b\u00ed materi\u00e1l s rozs\u00e1hlou \u0161k\u00e1lou vlastnost\u00ed a slo\u017een\u00ed. Nap\u0159\u00edklad na jednom extr\u00e9mu lze infiltrovat uhl\u00edkov\u00e9 vl\u00e1kno nebo tkaninu tekut\u00fdm k\u0159em\u00edkem. Na druh\u00e9m p\u00f3lu v\u0161ak m\u016f\u017eete vyrobit nepropustn\u00fd k\u0159em\u00edk s mal\u00fdm mno\u017estv\u00edm uhl\u00edku.
\nKrom\u011b toho mnoho v\u00fdrobc\u016f vyr\u00e1b\u011blo reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku s formulacemi, kter\u00e9 obsahuj\u00ed organick\u00e9 zm\u011bk\u010dovadlo, \u010d\u00e1stice karbidu k\u0159em\u00edku a uhl\u00edk. Sm\u011bs se tvo\u0159\u00ed lisov\u00e1n\u00edm, vytla\u010dov\u00e1n\u00edm nebo vst\u0159ikov\u00e1n\u00edm. V\u00fdrobci maj\u00ed nav\u00edc dobrou kontrolu nad toleranc\u00ed sou\u010d\u00e1st\u00ed, proto\u017ee reak\u010dn\u00ed proces nab\u00edz\u00ed m\u00e9n\u011b ne\u017e 1% rozm\u011brov\u00fdch zm\u011bn.<\/p>\n
\nExistuj\u00ed dva z\u00e1kladn\u00ed typy reak\u010dn\u011b v\u00e1zan\u00e9ho karbidu k\u0159em\u00edku:
\n1. Monolitick\u00fd nebo pevn\u00fd karbid k\u0159em\u00edku v\u00e1zan\u00fd reakc\u00ed
\nU tohoto typu karbidu k\u0159em\u00edku pronik\u00e1 k\u0159em\u00edk do integr\u00e1ln\u00ed savosti matrice. V\u00fdsledkem je nepropustn\u00e9 slo\u017een\u00ed. Voln\u00fd k\u0159em\u00edk tak\u00e9 vytv\u00e1\u0159\u00ed povrchovou strukturu, kter\u00e1 sn\u00ed\u017e\u00ed t\u0159en\u00ed pro prodlou\u017een\u00ed \u017eivotnosti sou\u010d\u00e1sti.
\nMonolitick\u00fd reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku je vhodn\u00fdm kandid\u00e1tem pro tribologick\u00e9 komponenty. Pou\u017e\u00edv\u00e1 se v kapalin\u00e1ch, kter\u00e9 jsou pon\u011bkud \u017e\u00edrav\u00e9 nebo kysel\u00e9, v\u010detn\u011b abraziv, paliv, lehk\u00fdch uhlovod\u00edk\u016f atd. Nab\u00edz\u00ed nejvy\u0161\u0161\u00ed PV schopnost p\u0159i spojen\u00ed s r\u016fzn\u00fdmi mechanick\u00fdmi uhl\u00edkov\u00fdmi materi\u00e1ly.
\n2. Karbid k\u0159em\u00edku v\u00e1zan\u00fd reakc\u00ed s grafitem (CMC)
\nJedn\u00e1 se o nepropustn\u00fd materi\u00e1l s jedine\u010dnou strukturou povrchu. Jeho kr\u00e1sn\u00e1 textura je zp\u016fsobena p\u0159\u00edtomnost\u00ed grafitu a k\u0159em\u00edku. Tento typ keramiky z karbidu k\u0159em\u00edku m\u00e1 tak\u00e9 vynikaj\u00edc\u00ed tepelnou vodivost a ni\u017e\u0161\u00ed stupe\u0148 tepeln\u00e9 rozta\u017enosti. D\u00edky t\u011bmto schopnostem je vhodn\u00fd pro aplikace n\u00e1chyln\u00e9 k r\u016fzn\u00fdm t\u0159ec\u00edm sil\u00e1m, n\u00e1raz\u016fm, erozi, ot\u011bru, vysok\u00fdm teplot\u00e1m a tepeln\u00fdm \u0161ok\u016fm.<\/p>\n
\nT\u0159\u00edda materi\u00e1lu definuje vlastnosti r\u016fzn\u00fdch slo\u017eek karbidu k\u0159em\u00edku. Nap\u0159\u00edklad v p\u0159\u00edpad\u011b pln\u011b hust\u00e9ho kompozitu SIC-SI vykazuje materi\u00e1l vynikaj\u00edc\u00ed pevnost v ohybu p\u0159i pokojov\u00e9 teplot\u011b. A tuto vlastnost si zachov\u00e1v\u00e1 a\u017e do teploty t\u00e1n\u00ed k\u0159em\u00edku, kter\u00e1 je 1410o C. Jeho Young\u016fv modul se pohybuje v rozmez\u00ed 350 a\u017e 400 GPa.
\nN\u00ed\u017ee jsou uvedeny n\u011bkter\u00e9 kl\u00ed\u010dov\u00e9 vlastnosti karbidu k\u0159em\u00edku:
\nKarbid k\u0159em\u00edku m\u00e1 vynikaj\u00edc\u00ed schopnost odol\u00e1vat \u0161irok\u00e9 \u0161k\u00e1le kyselin a louh\u016f.
\nM\u00e1 dobrou odolnost proti opot\u0159eben\u00ed a oxidaci.
\nMateri\u00e1l m\u00e1 dobrou odolnost proti od\u011bru.
\nD\u00edky vysok\u00e9 tepeln\u00e9 vodivosti a n\u00edzk\u00e9mu koeficientu tepeln\u00e9 rozta\u017enosti m\u00e1 vynikaj\u00edc\u00ed odolnost proti tepeln\u00fdm \u0161ok\u016fm.
\nZachov\u00e1v\u00e1 si pevnost i p\u0159i velmi vysok\u00fdch teplot\u00e1ch.
\nKarbid k\u0159em\u00edku m\u00e1 dobrou rozm\u011brovou kontrolu slo\u017eit\u00fdch tvar\u016f.<\/p>\n
\n1. Opot\u0159ebiteln\u00e9 d\u00edly a axi\u00e1ln\u00ed lo\u017eiska
\nsisic se vyzna\u010duje vynikaj\u00edc\u00ed odolnost\u00ed proti opot\u0159eben\u00ed a korozi, vysokou tvrdost\u00ed a pevnost\u00ed p\u0159i vysok\u00fdch teplot\u00e1ch. D\u00edky t\u011bmto vlastnostem je ide\u00e1ln\u00ed pro r\u016fzn\u00e9 opot\u0159ebiteln\u00e9 sou\u010d\u00e1sti, jako jsou desky, \u0161rouby a ob\u011b\u017en\u00e1 kola. D\u00e1le jej m\u016f\u017eete pou\u017e\u00edt tak\u00e9 v axi\u00e1ln\u00edch lo\u017eisk\u00e1ch, kter\u00e1 v\u00e1m velmi pomohou p\u0159en\u00e1\u0161et extr\u00e9mn\u011b vysok\u00e9 zat\u00ed\u017een\u00ed ve velmi zne\u010di\u0161t\u011bn\u00fdch kapalin\u00e1ch.
\nD\u00edky jeho kl\u00ed\u010dov\u00fdm vlastnostem mohou v\u00fdrobci vyr\u00e1b\u011bt kompaktn\u00ed lo\u017eiska, kter\u00e1 mohou pracovat v teplotn\u00edm rozsahu od -200o C do 400o C.
\n2. N\u00e1bytek pece a podp\u016frn\u00e9 sou\u010d\u00e1sti
\nOdolnost proti oxidaci, tepeln\u00fdm \u0161ok\u016fm a vysok\u00fdm teplot\u00e1m umo\u017e\u0148uje spole\u010dnostem vyr\u00e1b\u011bt podp\u011bry pro pece s n\u00edzkou hmotnost\u00ed. Mezi r\u016fzn\u00e9 v\u00fdrobky pro pece pat\u0159\u00ed sloupky, trysky ho\u0159\u00e1k\u016f, tenkost\u011bnn\u00e9 nosn\u00edky, nastavovac\u00ed za\u0159\u00edzen\u00ed a v\u00e1lce.
\nTyto v\u00fdrobky pom\u00e1haj\u00ed \u0161et\u0159it energii a nab\u00edzej\u00ed mo\u017enost rychlej\u0161\u00edho pr\u016fchodu v\u00fdrobk\u016f sn\u00ed\u017een\u00edm tepeln\u00e9 hmotnosti pecn\u00edch voz\u016f. Pece na b\u00e1zi RBSC by v\u0161ak byly t\u00e9m\u011b\u0159 \u010dty\u0159ikr\u00e1t dra\u017e\u0161\u00ed ve srovn\u00e1n\u00ed s kordieritem.
\n3. P\u0159esn\u00e9 komponenty
\nPo reakci s kapaln\u00fdm k\u0159em\u00edkem zaznamen\u00e1te zanedbateln\u011b malou zm\u011bnu objemu. Tato vlastnost umo\u017e\u0148uje vynikaj\u00edc\u00ed kontrolu rozm\u011br\u016f slo\u017eit\u00fdch tvar\u016f. M\u016f\u017eete nap\u0159\u00edklad vyr\u00e1b\u011bt laserov\u00e9 zrcadlov\u00e9 polotovary, optick\u00e9 lavice a za\u0159\u00edzen\u00ed pro manipulaci s desti\u010dkami. Tyto komponenty jsou tuh\u00e9 a lehk\u00e9 a maj\u00ed vynikaj\u00edc\u00ed tepelnou stabilitu.<\/p>\n
\nReak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku je materi\u00e1l, kter\u00fd obsahuje p\u0159ibli\u017en\u011b 7 a\u017e 15% kovov\u00e9ho k\u0159em\u00edku, mal\u00e9 mno\u017estv\u00ed nezreagovan\u00e9ho uhl\u00edku a karbid k\u0159em\u00edku. Tyto materi\u00e1ly se vyr\u00e1b\u011bj\u00ed r\u016fzn\u00fdmi postupy v z\u00e1vislosti na pot\u0159eb\u011b kone\u010dn\u00e9ho v\u00fdrobku. Pokud nap\u0159\u00edklad chcete vyr\u00e1b\u011bt opot\u0159ebiteln\u00e9 d\u00edly, budou v\u00fdrobn\u00ed procesy SiC-Si jin\u00e9 ne\u017e procesy pou\u017e\u00edvan\u00e9 pro v\u00fdrobu p\u0159esn\u00fdch sou\u010d\u00e1st\u00ed. reak\u010dn\u011b v\u00e1zan\u00fd karbid k\u0159em\u00edku je ide\u00e1ln\u00ed pro opot\u0159ebiteln\u00e9 aplikace, jako jsou tlumivky pro regulaci pr\u016ftoku, potrub\u00ed a v\u011bt\u0161\u00ed opot\u0159ebiteln\u00e9 sou\u010d\u00e1sti. Jedn\u00e1 se o ekonomick\u00fd a spolehliv\u00fd materi\u00e1l pro spoustu aplikac\u00ed d\u00edky jeho vynikaj\u00edc\u00edm vlastnostem.<\/p>","protected":false},"excerpt":{"rendered":"