Silicon carbide ua haujlwm zoo li pob zeb diamond. Nws tsis yog tsuas yog lub teeb tshaj plaws xwb, tab sis kuj yog cov khoom siv ceramic nyuaj tshaj plaws thiab muaj kev ua tau zoo heev, kev nthuav dav thermal tsawg thiab tiv taus cov kua qaub thiab lyes heev.
Nrog cov khoom siv silicon carbide ceramics cov khoom siv tseem nyob ruaj khov txog li qhov kub siab tshaj 1,400 ° C. Lub siab Young's modulus > 400 GPa ua kom muaj kev ruaj khov zoo heev. Cov khoom siv no ua rau silicon carbide tau npaj tseg rau kev siv ua cov khoom siv hauv kev tsim kho. Silicon carbide tswj kev xeb, kev puas tsuaj thiab kev yaig zoo li nws sawv ntsug rau kev hnav tsis sib xws. Cov khoom siv tau siv rau hauv cov nroj tsuag tshuaj, cov chaw zeb, cov tshuab nthuav dav thiab cov tshuab extruders lossis ua cov nozzles, piv txwv li.
Cov variants SSiC (sintered silicon carbide) thiab SiSiC (silicon infiltrated silicon carbide) tau tsim lawv tus kheej. Qhov kawg yog qhov tshwj xeeb tshaj yog rau kev tsim cov khoom loj loj.
Silicon carbide muaj kev nyab xeeb rau tshuaj lom thiab siv tau rau hauv kev lag luam zaub mov. Lwm daim ntawv thov rau cov khoom siv silicon carbide yog kev siv tshuab dynamic sealing siv cov bearings sib txhuam thiab cov foob pob hluav taws xob, piv txwv li hauv cov twj tso kua mis thiab cov tshuab tsav. Piv rau cov hlau, silicon carbide ua rau muaj kev daws teeb meem pheej yig heev nrog lub neej ntev dua thaum siv nrog cov khoom siv kub thiab kub heev. Silicon carbide ceramics kuj zoo tagnrho rau kev siv rau hauv cov xwm txheej nyuaj hauv ballistics, kev tsim tshuaj lom neeg, kev siv tshuab hluav taws xob, kev tsim ntawv thiab ua cov khoom siv yeeb nkab.
Cov tshuaj tiv thaiv silicon carbide, tseem hu ua siliconized silicon carbide lossis SiSiC, yog ib hom silicon carbide uas tsim los ntawm kev sib xyaw ua ke ntawm cov pa roj carbon lossis graphite nrog cov silicon molten. Vim yog cov khoom seem ntawm silicon, cov tshuaj tiv thaiv silicon carbide feem ntau hu ua siliconized silicon carbide, lossis nws cov lus luv SiSiC.
Yog tias cov silicon carbide ntshiab yog tsim los ntawm kev sintering ntawm silicon carbide hmoov, nws feem ntau muaj cov tshuaj hu ua sintering aids, uas tau ntxiv los txhawb cov txheej txheem sintering los ntawm kev tso cai rau qhov kub qis dua sintering. Hom silicon carbide no feem ntau hu ua sintered silicon carbide, lossis luv rau SSiC.
Cov hmoov silicon carbide tau los ntawm silicon carbide tsim tawm raws li tau piav qhia hauv tsab xov xwm silicon carbide.
（Viewed from: CERAMTEC）caroline@rbsic-sisic.com
Lub sijhawm tshaj tawm: Kaum Ib Hlis-12-2018