Dab tsi yog qhov sib xyaw ntawm silicon carbide refractories?
Oct 14, 2024
Tso lus
Silicon carbide refractory Nws yog 10% -40% ntawm cov av nplaum thiab silicon carbide sib xyaw ua ke, nias lossis rammed molding, raug rho tawm haujlwm hauv qhov cub zoo tib yam. Av nplaum silicon carbide yog siv rau hauv Muffle furnaces rau zinc smelting furnaces thiab ceramic furnaces.
Qhov tseeb, feem ntau siv SiO2 raws li qib kev khi. Nws yog sib tov ntawm 5%, 10% SiO2 hmoov los yog nplua quartz hmoov nrog SiC hais. Qee zaum xav tau ib qho flux, uas yog ci hauv qhov cub tsis tu ncua tom qab nias thiab sib sau. Nws yog tus cwj pwm los ntawm txheej txheej ntawm SiO2 zaj duab xis ntawm SiC hais thaum ua noj thiab siv, uas muaj oxidation zoo dua li Clay-SiC thiab kub ua hauj. Cov khoom no tau dav siv los ua cov tais ci rau cov plooj (porcelain firing) (1300), thiab nws lub neej kev pab cuam yog ntau tshaj ob npaug ntawm Clay-SiC. Al2O3 hmoov thiab SiO2 hmoov yog ntxiv rau cov khoom xyaw, siab molding, thiab Al2O3 thiab SiO2 tau muab tso ua ke rau hauv cov txheej txheem sintering. Hauv cov txheej txheem ntawm kev siv, SiO2 tsim los ntawm oxidation ntawm SiC kuj tsim mullite nrog Al2O3 ib feem. Cov khoom no muaj qhov zoo thermal shock stability thiab yog siv dav hauv kev tsim cov plooj (porcelain plates) thiab daim hlau. Silicon hlau hmoov thiab silicon carbide xuab zeb yog tov thiab tsim, thiab raug rho tawm haujlwm hauv kev tiv thaiv nitrogen. Si reacts nrog N2 los ua Si3N4 los khi SiC. Cov khoom no yog siv dav hauv kev tsim cov silicon carbide cib rau blast furnace, refractory qhov cub thiab lwm yam. Siv SiC ua raw khoom, SiC raug tshem tawm yog tsim los ntawm kev sib cais kom zoo thiab sib ntxiv ntawm cov surfactants, thiab hauv Ar cua lossis sintering rauv casting (tseem tuaj yeem ua cov pwm molding) ntau tshaj 2000 kub nqus sintering, SiC evaporation thiab condensation thiab recrystallization ntawm Kev sib txuas ntawm SiC hais los khi SiC hais. Nws muaj cov yam ntxwv ntawm qhov kub thiab txias tsis kam, muaj zog oxidation tsis kam thiab zoo thermal poob siab stability, thiab yog ib tug kub resistant engineering khoom. Kilns nyob rau hauv ceramics thiab kev sib tsoo log kev lag luam siv R-SiC kab teeb los tsim cov tsheb laij teb uas siv tau txog li 1600 degrees.
