Peb txhua tus paub tias silicon carbide tau siv dav hauv lub neej niaj hnub niaj hnub, kev tsim khoom lag luam, thiab cov khoom siv high-tech xws li chips, tub rog, aviation, thiab lwm yam Txawm hais tiasdub silicon carbidethiabntsuab silicon carbideyog ob hom silicon carbide. Tab sis lawv cov kev siv thiab cov nqi ua haujlwm txawv.
Dub silicon carbide yog ua los ntawm quartz xuab zeb, roj av coke thiab zoo silica raws li cov ntaub ntawv tseem ceeb, thiab yog smelted ntawm kub kub nyob rau hauv lub qhov cub tsis kam. Nws hardness yog nruab nrab ntawm xim av aluminium oxide thiab pob zeb diamond, nws lub zog txhua yam yog siab dua li xim av aluminium oxide, nws yog nkig thiab ntse, thiab nws yog pheej yig dua li ntsuab silicon carbide.
Txoj kev tsim ntawm ntsuab silicon carbide yog tib yam li cov dub silicon carbide, tab sis cov purity ntawm raw cov ntaub ntawv siv yog ntau dua. Nws kuj yog tsim los ntawm qhov kub siab ntawm txog 2200 ° C hauv qhov cub tsis kam. Nws yog ntsuab, translucent, thiab hexagonal. Nws cov ntsiab lus silicon carbide siab dua li cov xim dub silicon carbide. Nws lub cev muaj zog zoo ib yam li cov dub silicon carbide, tab sis nws qhov kev ua tau zoo yog me ntsis nkig dua li cov xim dub, thiab nws kuj muaj cov thermal conductivity zoo thiab cov khoom semiconductor. Nws hardness yog nyob nruab nrab ntawm cov xim av aluminium oxide thiab pob zeb diamond, nws lub zog txhua yam yog siab dua li xim av aluminium oxide, thiab nws kim dua li dub silicon carbide.
Daim ntawv thov thiab cov yam ntxwv ntawm silicon carbide:
Ob hom silicon carbide yog α-SiC.
① Dub silicon carbide muaj txog 95% SiC, thiab nws cov tawv tawv yog siab dua li ntawm ntsuab silicon carbide. Nws feem ntau yog siv los ua cov ntaub ntawv uas tsis muaj zog tensile, xws li iav, ceramics, pob zeb, cov ntaub ntawv refractory, cam khwb cia hlau thiab cov hlau tsis muaj hlau.
② Ntsuab silicon carbide muaj ntau tshaj li ntawm 97% SiC thiab muaj cov khoom zoo rau tus kheej. Nws feem ntau yog siv los ua cov cemented carbide, titanium alloy thiab optical iav. Nws kuj yog siv rau honing lub tog raj kheej liner thiab zoo sib tsoo ntawm high-ceev steel cov cuab yeej. Tsis tas li ntawd, muaj cubic silicon carbide, uas yog lub teeb daj-ntsuab siv lead ua los ntawm cov txheej txheem tshwj xeeb. Cov cuab yeej sib tsoo siv los ua kom nws tsim nyog rau superfinishing ntawm bearings, thiab tuaj yeem ua rau qhov roughness ntawm Ra32 ~ 0.16 microns rau Ra0 04 ~ 0.02 microns hauv ib qho sij hawm.
