Raws li qhov muab tub lim ntawm lub qhov cub tawg kais qhov, cov hmoov phom tsis muaj dej yuav tsum muaj cov yas zoo thiab tuaj yeem ua kom tiav. Tom qab cov hmoov phom tau tsav, nws yuav tsum tsim kom muaj zog sai li sai tau kom txo lub sij hawm nias. Cov av tsis muaj dej tsis muaj av yuav tsum muaj cov yam ntxwv ntawm kev ua haujlwm zoo rau molten hlau scouring, siab kub lub zog, thiab zoo tiv thaiv molten hlau corrosion, thiaj li ua kom cov hlau molten ruaj khov.
Cov ntaub ntawv tseem ceeb ntawm cov av nkos tsis muaj dej muaj xws li: xim av corundum, silicon carbide, coke, av nkos dawb thiab tar. Lub zog siab ntawm rab phom av nkos yog 20Mpa, thiab cov yas yog zoo. Thaum tapping ntawm qhov kub thiab txias, qhov qhib tau yooj yim, thiab muaj qhov zoo micro-expansion, tsis tawg, thiab zoo scouring kuj
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