Carbura de siliciu este un material ceramic structural de ne\u00eenlocuit datorit\u0103 rezisten\u021bei sale excep\u021bionale la temperaturi ridicate \u0219i rezisten\u021bei la oxidare, ceea ce o face indispensabil\u0103 \u00een domeniile produc\u021biei mecanice, tehnologiei aerospa\u021biale \u0219i electronicii informa\u021bionale.<\/p>\n
Sinterizarea prin reac\u021bie ofer\u0103 temperaturi sc\u0103zute \u0219i timpi scur\u021bi de sinterizare, produc\u00e2nd \u00een acela\u0219i timp forme aproape netede, dar este limitat\u0103 de distribu\u021bia inegal\u0103 a densit\u0103\u021bii, fisurarea produselor sinterizate \u0219i penetrarea insuficient\u0103 a siliciului \u00een timpul proceselor de sinterizare.<\/p>\n
Carbura de siliciu este un material ceramic extrem de dur \u0219i rezistent, renumit pentru propriet\u0103\u021bile sale superioare de rezisten\u021b\u0103 la temperaturi ridicate, rezisten\u021b\u0103 la uzur\u0103 \u0219i rezisten\u021b\u0103 la oxidarea chimic\u0103. Datorit\u0103 acestor caracteristici, carbura de siliciu este utilizat\u0103 \u00een numeroase aplica\u021bii industriale, inclusiv \u00een centrale nucleare, cuptoare, motoare cu reac\u021bie, ajutaje de rachete \u0219i fabricarea h\u00e2rtiei.<\/p>\n
O modalitate de \u00eembun\u0103t\u0103\u021bire a propriet\u0103\u021bilor mecanice la temperaturi ridicate ale carburii de siliciu sinterizate este ad\u0103ugarea de aditivi precum aluminiu, bor \u0219i carbon (SiC-ABC) care sporesc rezisten\u021ba la fluaj. Ace\u0219ti aditivi modific\u0103 energiile limitelor granulelor \u0219i energiile de suprafa\u021b\u0103, cresc\u00e2nd \u00een acela\u0219i timp ratele de difuzie a volumului \u0219i descuraj\u00e2nd formarea de sticl\u0103 la limitele granulelor.<\/p>\n
O alt\u0103 modalitate de cre\u0219tere a propriet\u0103\u021bilor mecanice este sinterizarea f\u0103r\u0103 presiune, care implic\u0103 sinterizarea compactelor de pulbere SiC f\u0103r\u0103 aplicarea unei presiuni externe. Avantajul acestei metode const\u0103 \u00een eliminarea varia\u021biilor de densitate cauzate de metodele tradi\u021bionale de sinterizare prin presare la cald, care duc la modific\u0103ri dimensionale semnificative \u0219i la reducerea calit\u0103\u021bii produselor - de asemenea, creeaz\u0103 densit\u0103\u021bi mai apropiate de valorile teoretice dec\u00e2t oric\u00e2nd \u00eenainte.<\/p>\n
Carbura de siliciu prezint\u0103 o rezisten\u021b\u0103 chimic\u0103 excelent\u0103 la coroziune \u00eentr-o gam\u0103 larg\u0103 de medii de p\u00e2n\u0103 la 1700 de grade C, cum ar fi oxigen uscat, vapori gazo\u0219i fierbin\u021bi \u0219i s\u0103ruri \u0219i metale lichide, precum \u0219i s\u0103ruri topite \u0219i zgur\u0103 de cenu\u0219\u0103 de c\u0103rbune.<\/p>\n
Carbura de siliciu sinterizat\u0103 ofer\u0103 o rezisten\u021b\u0103 excelent\u0103 la coroziune datorit\u0103 structurii \u0219i calit\u0103\u021bii suprafe\u021bei sale. Acest material se m\u00e2ndre\u0219te cu o rezisten\u021b\u0103 puternic\u0103 la eroziune (alunecare), rezisten\u021b\u0103 mecanic\u0103, \u0219oc termic \u0219i uzur\u0103.<\/p>\n
Materialul de carbur\u0103 de siliciu sinterizat la temperaturi ridicate XICAR (denumit \u00een mod obi\u0219nuit Hexoloy SE alternativ) s-a dovedit foarte rezistent la coroziunea chimic\u0103 \u00een medii acide precum HCl concentrat \u0219i HNO3, specimenele tratate cu Y2O3 av\u00e2nd o rezisten\u021b\u0103 mai mare dec\u00e2t cele care utilizeaz\u0103 ajutorul de sinterizare MgO.<\/p>\n
Carbura de siliciu sinterizat\u0103 legat\u0103 prin reac\u021bie, denumit\u0103 \u00een mod obi\u0219nuit carbur\u0103 de siliciu autolegant\u0103, este produs\u0103 prin reac\u021bia unui corp ceramic poros care con\u021bine carbon cu siliciu lichid. Acest amestec se infiltreaz\u0103 \u00een corpul ceramic, reac\u021bioneaz\u0103 cu grafitul pentru a forma b-SiC \u0219i apoi se combin\u0103 cu particulele a-SiC existente pentru a forma carbur\u0103 de siliciu sinterizat\u0103 prin reac\u021bie cu densitate complet\u0103, cu diferite forme disponibile prin acest proces.<\/p>\n
Carbura de siliciu este unul dintre cele mai puternice materiale ceramice. Av\u00e2nd o rezisten\u021b\u0103 superioar\u0103 la temperaturi ridicate \u0219i rezisten\u021b\u0103 la oxidare, carbura de siliciu reprezint\u0103 o alegere excelent\u0103 de material pentru utilizarea \u00een multe aplica\u021bii industriale.<\/p>\n
Ceramica din carbur\u0103 de siliciu poate fi fabricat\u0103, de obicei, prin procese de fabrica\u021bie prin sinterizare f\u0103r\u0103 presiune sau prin reac\u021bie de lipire, iar Saint-Gobain Performance Ceramics & Refractories ofer\u0103 ambele tipuri pentru a satisface o gam\u0103 larg\u0103 de aplica\u021bii finale.<\/p>\n
Carbura de siliciu sinterizat\u0103 f\u0103r\u0103 presiune este produs\u0103 prin combinarea pulberii de SiC cu particule fine cu adjuvan\u021bi de sinterizare non-oxid \u0219i sinterizarea acesteia la temperaturi mai mari de 2000degC \u00eentr-o atmosfer\u0103 inert\u0103, produc\u00e2nd un material de \u00eenalt\u0103 densitate cu rezisten\u021b\u0103 superioar\u0103 la oxidare, rezisten\u021b\u0103 la coroziune \u0219i propriet\u0103\u021bi mecanice.<\/p>\n
Sinterizarea prin reac\u021bie este un proces \u00een curs de dezvoltare pentru producerea ceramicii din carbur\u0103 de siliciu (SiC), oferind avantaje precum structuri dense, temperaturi de prelucrare mai sc\u0103zute, capacitate de modelare, costuri reduse \u0219i puritate mai mare. Cu toate acestea, din p\u0103cate, rezisten\u021ba la \u00eencovoiere este mult sub cea a SiC sinterizat standard din cauza dimensiunilor reziduale de carbon (Si) din microstructura sa.<\/p>\n
Ceramica de carbur\u0103 de siliciu sinterizat\u0103 se num\u0103r\u0103 printre cele mai dure \u0219i mai puternice materiale ceramice, r\u0103m\u00e2n\u00e2nd \u00een acela\u0219i timp rezistent\u0103 la temperaturi extrem de ridicate - ceea ce o face o alegere excelent\u0103 pentru aplica\u021bii \u00een care rezisten\u021ba la temperaturi ridicate este esen\u021bial\u0103.<\/p>\n
SSIC prezint\u0103 o rezisten\u021b\u0103 aproape constant\u0103 \u00eentr-o gam\u0103 larg\u0103 de temperaturi \u0219i \u00ee\u0219i p\u0103streaz\u0103 duritatea chiar \u0219i sub presiune intens\u0103, ceea ce \u00eel face o alegere de material foarte popular\u0103 pentru componente de pompe de \u00eenalt\u0103 performan\u021b\u0103 \u0219i alte piese de echipamente esen\u021biale.<\/p>\n
SSIC sunt produse folosind tehnici conven\u021bionale de formare a ceramicii. Dup\u0103 ce au fost formate \u00een formele dorite, SSIC sunt sinterizate la temperaturi \u0219i presiuni ridicate \u00eentr-o atmosfer\u0103 de gaz inert.<\/p>\n
Sinterizarea poate fi \u00eemp\u0103r\u021bit\u0103 \u00een dou\u0103 faze distincte, sinterizarea \u00een faz\u0103 solid\u0103 \u0219i sinterizarea \u00een faz\u0103 lichid\u0103. Sinterizarea \u00een faz\u0103 solid\u0103 necesit\u0103 ad\u0103ugarea de C \u0219i B ca adjuvan\u021bi de sinterizare pentru a reduce energia limitelor granulelor ceramicii SiC, \u00een timp ce faza lichid\u0103 utilizeaz\u0103 unul sau mai mul\u021bi oxizi eutectici de elemente (cum ar fi Y2O3) ca agent, cre\u00e2nd o faz\u0103 electrolitic\u0103 cu mi\u0219care, difuzie \u0219i transfer de mas\u0103 \u00eentre particulele de silice pentru a densifica densitatea materialului.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide is an irreplaceable structural ceramic material due to its exceptional high temperature strength and oxidation resistance, making it […]<\/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":[5],"tags":[],"class_list":["post-72","post","type-post","status-publish","format-standard","hentry","category-product-related"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/posts\/72","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/comments?post=72"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/posts\/72\/revisions"}],"predecessor-version":[{"id":73,"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/posts\/72\/revisions\/73"}],"wp:attachment":[{"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/media?parent=72"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/categories?post=72"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/ro\/wp-json\/wp\/v2\/tags?post=72"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}