Karbid krem\u00edka je jedn\u00fdm z najtvrd\u0161\u00edch a najodolnej\u0161\u00edch keramick\u00fdch materi\u00e1lov na trhu, ktor\u00fd poskytuje ochranu pred kor\u00f3ziou, opotrebovan\u00edm a vysok\u00fdmi teplotami.<\/p>\n
Reak\u010dne viazan\u00fd karbid krem\u00edka sa vyr\u00e1ba reakciou por\u00e9zneho uhl\u00edka s kvapaln\u00fdm alebo plynn\u00fdm krem\u00edkom a infiltr\u00e1ciou \u010fal\u0161ieho krem\u00edka, \u010d\u00edm sa vytvor\u00ed hust\u00e1 keramick\u00e1 \u010das\u0165.<\/p>\n
Karbid krem\u00edka viazan\u00fd nitridom (NB SiC) je kompozitn\u00fd \u017eiaruvzdorn\u00fd materi\u00e1l zlo\u017een\u00fd z nitridu karbidu krem\u00edka ako keramickej f\u00e1zy, ktor\u00e1 vytv\u00e1ra pevn\u00fd, pru\u017en\u00fd a odoln\u00fd materi\u00e1l. Ako jeden z najtvrd\u0161\u00edch technick\u00fdch materi\u00e1lov, ktor\u00e9 s\u00fa v s\u00fa\u010dasnosti k dispoz\u00edcii, je NB SiC odoln\u00fd vo\u010di opotrebovaniu \u010dasticami alebo tvrd\u00fdmi povrchmi, ako s\u00fa povrchy. Okrem toho jeho chemick\u00e1 inertnos\u0165 umo\u017e\u0148uje, aby zostal odoln\u00fd vo\u010di v\u00e4\u010d\u0161ine kysel\u00edn, z\u00e1sad a halogenidov, pri\u010dom je vysoko h\u00fa\u017eevnat\u00fd a schopn\u00fd odol\u00e1va\u0165 ve\u013ek\u00fdm za\u0165a\u017eeniam a n\u00e1razom.<\/p>\n
Karbid krem\u00edka viazan\u00fd nitridom sa d\u00e1 \u013eahko formova\u0165 do zlo\u017eit\u00fdch a presn\u00fdch tvarov prostredn\u00edctvom Blaschovho procesu, \u010do umo\u017e\u0148uje jeho pou\u017eitie v aplik\u00e1ci\u00e1ch, ktor\u00e9 si vy\u017eaduj\u00fa \u017eiaruvzdorn\u00e9 aj mechanick\u00e9 vlastnosti. Okrem toho jeho lomov\u00e1 h\u00fa\u017eevnatos\u0165 prevy\u0161uje lomov\u00fa h\u00fa\u017eevnatos\u0165 spekan\u00e9ho SiC, v\u010faka \u010domu je vhodn\u00fd do n\u00e1ro\u010dn\u00fdch prostred\u00ed, v ktor\u00fdch doch\u00e1dza k oderu a n\u00e1razov\u00e9mu nam\u00e1haniu.<\/p>\n
V\u0161imnite si, \u017ee existuj\u00fa dve met\u00f3dy v\u00fdroby karbidu krem\u00edka: reak\u010dn\u00e9 sp\u00e1janie a spekanie. Ka\u017ed\u00e1 met\u00f3da tvarovania v\u00fdrazne ovplyv\u0148uje mikro\u0161trukt\u00faru kone\u010dn\u00e9ho v\u00fdrobku, \u010do vedie k odli\u0161n\u00fdm tepeln\u00fdm a mechanick\u00fdm vlastnostiam, ako ke\u010f sa vyr\u00e1ba v\u00fdlu\u010dne spekan\u00edm. Ni\u017e\u0161ie je uveden\u00fd preh\u013ead ka\u017edej z t\u00fdchto techn\u00edk tv\u00e1rnenia:<\/p>\n
Reak\u010dne viazan\u00fd karbid krem\u00edka vznik\u00e1 pridan\u00edm kvapaln\u00e9ho krem\u00edka do kompaktu, ktor\u00fd obsahuje zmesi SiC a uhl\u00edka, pri\u010dom reaguje s uhl\u00edkom za vzniku \u010fal\u0161\u00edch z\u0155n karbidu krem\u00edka a z\u00e1rove\u0148 sp\u00e1ja p\u00f4vodn\u00e9 zrn\u00e1 SiC. Po vytvoren\u00ed sa tento materi\u00e1l d\u00e1 \u013eahko formova\u0165 do r\u00f4znych tvarov a ve\u013ekost\u00ed, v\u010faka \u010domu je vhodn\u00fd na aplik\u00e1cie, ako je n\u00e1bytok do pec\u00ed, mechanick\u00e9 tesnenia a tlmi\u010de na regul\u00e1ciu prietoku.<\/p>\n
Karbid krem\u00edka s nitridovou v\u00e4zbou sa u\u017e dlho vyu\u017e\u00edva na aplik\u00e1cie zah\u0155\u0148aj\u00face odolnos\u0165 proti oderu; v testoch odolnosti proti er\u00f3zii v p\u00f4dnych podmienkach sa v\u0161ak uk\u00e1zalo, \u017ee je vynikaj\u00faci aj v porovnan\u00ed s v\u00fdrobkami zo spekanej ocele s obsahom b\u00f3ru v podmienkach sypkej aj hustej p\u00f4dy.<\/p>\n
Reak\u010dn\u00e9 lepenie je inovat\u00edvna technika, ktor\u00e1 sa pou\u017e\u00edva na v\u00fdrobu keramick\u00fdch dielov z karbidu krem\u00edka ak\u00e9hoko\u013evek tvaru alebo ve\u013ekosti s pou\u017eit\u00edm lacnej\u0161\u00edch v\u00fdrobn\u00fdch postupov ako pri spekanom karbide krem\u00edka (SSC). \u017diaruvzdorn\u00e1 keramika vyroben\u00e1 touto technol\u00f3giou je zn\u00e1ma svojou pevnos\u0165ou, odolnos\u0165ou proti kor\u00f3zii a extr\u00e9mnym teplot\u00e1m - v\u010faka t\u00fdmto vlastnostiam je vhodn\u00e1 pre vykurovacie zariadenia, ako je n\u00e1bytok do pec\u00ed, ako aj pre s\u00fa\u010dasti podliehaj\u00face opotrebovaniu, napr\u00edklad tesnenia a ventily.<\/p>\n
\u017diaruvzdorn\u00e1 keramika vyr\u00e1ban\u00e1 touto technol\u00f3giou je zn\u00e1ma svojou vynikaj\u00facou odolnos\u0165ou vo\u010di tepeln\u00fdm \u0161okom. Ohybov\u00e1 a lomov\u00e1 h\u00fa\u017eevnatos\u0165 sa zvy\u0161uje so zvy\u0161uj\u00facim sa obsahom pevn\u00e9ho karbidu krem\u00edka viazan\u00e9ho reakciou; tento materi\u00e1l vznik\u00e1 v d\u00f4sledku chemickej reakcie medzi p\u00f3rovit\u00fdm uhl\u00edkom alebo grafitom a roztaven\u00fdm krem\u00edkom; jeho hlavn\u00fd sp\u00f4sob l\u00e1mania zah\u0155\u0148a medzikry\u0161talick\u00fd lom SiC, ako aj krehk\u00fd lom zo zvy\u0161kov\u00fdch uhl\u00edkov\u00fdch \u010dast\u00edc.<\/p>\n
Ak chcete dosiahnu\u0165 reak\u010dne viazan\u00fd karbid krem\u00edka, pred zahrievan\u00edm na teplotu 2000 F najprv skombinujte hrub\u00fd pr\u00e1\u0161ok karbidu krem\u00edka a neoxidov\u00e9 spekacie pom\u00f4cky. Po tomto kroku sa m\u00f4\u017eu pou\u017ei\u0165 techniky presn\u00e9ho br\u00fasenia na dokon\u010denie zmesi.<\/p>\n
V r\u00e1mci g\u00e9lovania karbidu krem\u00edka viazan\u00e9ho reakciou sa upravil pomer medzi furfurylalkoholom (FA) a fenolovou \u017eivicou, aby sa u\u013eah\u010dila polymeriz\u00e1cia a modifikoval \u010das g\u00e9lovania. Okrem toho sa sk\u00famal \u010das g\u00e9lovania aj morfol\u00f3gia p\u00f3rov mikropor\u00e9zneho uhl\u00edka; oboje sa uk\u00e1zalo ako u\u017eito\u010dn\u00e9 pri vytv\u00e1ran\u00ed reak\u010dne viazan\u00fdch \u0161trukt\u00far karbidu krem\u00edka.<\/p>\n
\u017diaruvzdorn\u00e1 keramika vyroben\u00e1 touto technol\u00f3giou je zn\u00e1ma ako RBSC. Na obr\u00e1zku 9 s\u00fa zobrazen\u00e9 XRD vzory SiC\/por\u00e9znych uhl\u00edkov\u00fdch telies s r\u00f4znym obsahom pevnej l\u00e1tky vyroben\u00e9 t\u00fdmto postupom; ich v\u00fdsledky ukazuj\u00fa, \u017ee telieska s vy\u0161\u0161\u00edm obsahom pevnej l\u00e1tky obsahovali menej vo\u013en\u00e9ho Si, o \u010dom sved\u010d\u00ed zv\u00fd\u0161en\u00e1 intenzita p\u00edkov pre f\u00e1zu a-SiC aj b-SiC v tejto \u017eiaruvzdornej keramike.<\/p>\n
Reak\u010dne viazan\u00fd karbid krem\u00edka (RBSC) je inovat\u00edvny keramick\u00fd materi\u00e1l, ktor\u00fd sa vyzna\u010duje v\u00fdnimo\u010dnou pevnos\u0165ou a tvrdos\u0165ou a z\u00e1rove\u0148 je schopn\u00fd odol\u00e1va\u0165 extr\u00e9mnym teplot\u00e1m. V\u010faka t\u00fdmto vlastnostiam je RBSC vynikaj\u00facou vo\u013ebou materi\u00e1lu pre n\u00e1bytok pec\u00ed, mechanick\u00e9 tesnenia a aplik\u00e1cie zariaden\u00ed na v\u00fdrobu polovodi\u010dov.<\/p>\n
RB SiC sa zvy\u010dajne vytv\u00e1ra zmie\u0161an\u00edm SiC pr\u00e1\u0161ku s uhl\u00edkom a zm\u00e4k\u010dovadlom vo forme, vyp\u00e1len\u00edm, aby sa odstr\u00e1nilo zm\u00e4k\u010dovadlo, a napusten\u00edm tekut\u00fdm alebo parn\u00fdm krem\u00edkom, ktor\u00fd reaguje s uhl\u00edkom za vzniku \u010fal\u0161ieho karbidu krem\u00edka - v\u00fdsledkom je extr\u00e9mne hust\u00fd vysoko v\u00fdkonn\u00fd produkt s vynikaj\u00facou odolnos\u0165ou proti opotrebovaniu a n\u00e1razom.<\/p>\n
Zlo\u017eenie, morfol\u00f3gia a ve\u013ekos\u0165 zdrojov uhl\u00edka zohr\u00e1vaj\u00fa obrovsk\u00fa \u00falohu pri formovan\u00ed mikro\u0161trukt\u00fary a vlastnost\u00ed RB SiC keramiky. Vo v\u0161eobecnosti plat\u00ed, \u017ee v\u00e4\u010d\u0161\u00ed obsah uhl\u00edka v predlisku vedie k v\u00e4\u010d\u0161ej koncentr\u00e1cii RB SiC vo v\u00fdslednej keramike. Okrem toho m\u00e1 v tomto procese vplyv aj ich reaktivita: od vysoko reakt\u00edvneho grafitu a\u017e po menej reakt\u00edvny mikrosf\u00e9rick\u00fd uhl\u00edk.<\/p>\n
Ktor\u00fd typ SiC je vhodn\u00fd pre va\u0161u aplik\u00e1ciu, z\u00e1vis\u00ed od jej zam\u00fd\u0161\u013ean\u00e9ho pou\u017eitia, napr\u00edklad od po\u017eiadaviek na tvrdos\u0165, hustotu a odolnos\u0165 proti kor\u00f3zii. Karbid krem\u00edka s nitridovou v\u00e4zbou aj s reak\u010dnou v\u00e4zbou pon\u00faka v\u00fdnimo\u010dn\u00fd v\u00fdkon v n\u00e1ro\u010dn\u00fdch podmienkach.<\/p>\n
Spekan\u00fd karbid krem\u00edka (SSiC), vyr\u00e1ban\u00fd lisovan\u00edm a spekan\u00edm, prekon\u00e1va RB SiC z h\u013eadiska pevnosti a tvrdosti; jeho tepeln\u00e1 vodivos\u0165 je v\u0161ak ni\u017e\u0161ia v d\u00f4sledku zlo\u017eitej\u0161\u00edch procesov spekania, ktor\u00e9 si vy\u017eaduj\u00fa ove\u013ea vy\u0161\u0161ie teploty na v\u00fdrobu; okrem toho je drah\u0161\u00ed kv\u00f4li zlo\u017eit\u00fdm v\u00fdrobn\u00fdm met\u00f3dam, ktor\u00e9 tento materi\u00e1l vy\u017eaduje - preto s\u00fa niektor\u00e9 aplik\u00e1cie pre t\u00fato formu nevhodn\u00e9. Na\u0161\u0165astie v\u00e1m spolo\u010dnos\u0165 Saint-Gobain Performance Ceramics & Refractories m\u00f4\u017ee pom\u00f4c\u0165 pri v\u00fdbere vhodnej keramiky pre va\u0161u aplik\u00e1ciu v\u010faka n\u00e1\u0161mu kompletn\u00e9mu sortimentu priemyseln\u00fdch v\u00fdrobkov odoln\u00fdch vo\u010di opotrebovaniu, ktor\u00e9 s\u00fa \u0161peci\u00e1lne navrhnut\u00e9 tak, aby sp\u013a\u0148ali \u0161pecifick\u00e9 po\u017eiadavky - zavolajte e\u0161te dnes pre viac inform\u00e1ci\u00ed alebo pomoc pri rozhodovan\u00ed o va\u0161ej aplik\u00e1cii!<\/p>","protected":false},"excerpt":{"rendered":"
Silicon Carbide is one of the hardest and most durable ceramic materials on the market, providing protection from corrosion, wear, and high temperatures. Reaction-bonded silicon carbide is produced by reacting porous carbon with liquid or gaseous silicon and infiltrating it with additional silicon to create a dense ceramic part. Nitride Bonded Silicon Carbide (NB SiC) […]<\/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-84","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/posts\/84","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/comments?post=84"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/posts\/84\/revisions"}],"predecessor-version":[{"id":85,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/posts\/84\/revisions\/85"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/media?parent=84"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/categories?post=84"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/tags?post=84"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}