Silicon carbide (SiC) yog tsim los ntawm kev siv quartz xuab zeb, roj av coke (lossis char char), thiab cov ntoo txaij ua cov ntaub ntawv raw los ntawm kev kub-smelting hauv qhov cub hluav taws xob tsis kam. Silicon carbide kuj tseem yog cov khoom uas tsis tshua muaj pob zeb hauv av, Moissanite.
Silicon carbide tseem muaj npe hu ua carbon silica. Ntawm cov tsis-oxide high-tech refractory raw cov ntaub ntawv xws li C, N thiab B, silicon carbide yog qhov feem ntau siv thiab kev lag luam ib yam. Nws tuaj yeem raug hu ua kub steel xuab zeb lossis cov xuab zeb refractory.
Silicon carbide yog ua los ntawm quartz xuab zeb, roj av coke (lossis char char), cov chips ntoo (yuav tsum tau ntsev thaum ntsuab silicon carbide yog tsim) thiab lwm cov ntaub ntawv smelted ntawm qhov kub ntawm qhov hluav taws xob tiv taus hluav taws xob. Tam sim no, Tuam Tshoj txoj kev lag luam tsim cov khoom siv silicon carbide tau muab faib ua cov xim dub silicon carbide thiab ntsuab silicon carbide, ob qho tib si hexagonal muaju, kev nqus ntawm 3.20 ~ 3.25, microhardness ntawm 2840 ~ 3320kg / mm2.
Xws li dub silicon carbide thiab ntsuab silicon carbide, ntawm cov uas: ntsuab silicon carbide yog ua los ntawm roj av coke thiab zoo-silica yog cov khoom siv tseem ceeb, ntxiv ntsev ua ib qho kev sib ntxiv, thiab smelted los ntawm hluav taws xob cua sov ntawm qhov kub. Nws qhov nyuaj yog ntawm corundum thiab pob zeb diamond, thiab nws lub zog kho tshuab yog siab dua qhov ntawm corundum. Feem ntau siv cov tshuaj silicon carbide abrasives muaj ob lub iav sib txawv, ib qho yog ntsuab silicon carbide, muaj ntau dua 97% SiC, feem ntau siv rau kev sib tsoo cov kub-muaj cov cuab yeej. Lwm qhov yog dub silicon carbide, uas muaj cov lus ntxig hlau, muaj ntau dua 95% SiC, thiab muaj lub zog siab dua li ntsuab silicon carbide, tab sis muaj qis dua hardness. Nws yog tsuas yog siv rau kev sib tsoo cov hlau thiab cov khoom siv tsis yog hlau.
Cov qauv tshuaj molecular yog SiC, nws cov hardness yog nruab nrab ntawm corundum thiab pob zeb diamond, nws cov khoom siv lub zog yog siab dua qhov ntawm corundum, thiab nws tuaj yeem siv ua cov nyom thiab qee yam khoom siv kev lag luam. Muaj cov tshuaj silicon carbide tau tsim tiav hauv 1891 thiab yog thawj cov khoom tsim muaj cov tawv tsiaj mos. Txawm hais tias ib qho me me ntawm silicon carbide tshwm sim nyob rau hauv vermiculite thiab crust, tsis muaj cov ntxhia pob zeb tau pom tau.
Cov ntshiab silicon carbide yog cov xim tsis muaj xim, pob tshab ntshiab. Muaj silicon carbide yog lub teeb daj, ntsuab, xiav lossis txawm dub vim yog hom thiab cov ntsiab lus ntawm impurities muaj nyob hauv nws. Lub pob tshab sib txawv nrog nws cov kev coj dawb huv. Lub qauv siv lead ua ntawm silicon carbide tau muab faib ua hexagonal lossis rhombohedral α-SiC thiab cubic β-SiC (hu ua cubic silicon carbide). Txij li α-SiC tsim ntau ntau yam sib txawv vim qhov sib txawv ntawm ntau qib ntawm cov roj carbon thiab silicon atoms hauv nws cov qauv siv lead ua, ntau dua 70 yam tau pom. β-SiC pauv mus rau α-SiC ntawm 2100 ° C lossis siab dua.
Txoj kev tsim khoom lag luam ntawm cov khoom siv silicon carbide tau ua kom zoo rau hauv cov hluav taws xob tsis kam uas siv cov zoo tshaj quartz xuab zeb thiab roj av coke. Tau txais silicon carbide block yog tsim rau hauv ntau yam ntawm cov khoom loj los ntawm kev sib tsoo, acid-puag ntxuav, sib nqus sib cais, tshuaj ntsuam lossis dej xaiv.
Silicon carbide muaj ob qho yooj yim ua ke ntawm dub silicon carbide thiab ntsuab silicon carbide, txhua tus yog α-SiC. 1 Dub silicon carbide muaj li 98.5% SiC, thiab nws cov tawv tawv siab dua li ntawm ntsuab silicon carbide. Nws feem ntau yog siv rau kev ua cov khoom siv nrog lub zog uas tsis tshua muaj zog, xws li iav, ceramics, pob zeb, cov khoom siv refractory, cam khwb cia hlau thiab tsis siv hlau. 2 Ntsuab silicon carbide muaj ntau dua li 99% SiC, qhov kev coj tus kheej, feem ntau siv rau kev ua cov tawv alloys, titanium alloys thiab tsom iav. Nws kuj yog siv rau honing lub tog raj kheej liners thiab zoo sib tsoo kub ceev cov cuab yeej steel. Tsis tas li ntawd, muaj cubic silicon carbide, uas yog lub teeb daj ntsuab-npaj siv los ntawm tus txheej txheem tshwj xeeb. Cov cuab yeej abrasive siv yog haum rau super-ua tiav ntawm cov kabmob, thiab qhov saum npoo tawv nqaij tuaj yeem ua tiav los ntawm Ra32 rau 0.16 micron rau Ra0.04 ~. 0.02 microns.
