Cov khoom siv refractory yog cov khoom sib xyaw uas tiv taus kub thiab corrosion thiab yog siv dav hauv ntau yam kev tsim khoom. Ib qho ntawm cov ntawv thov tseem ceeb yog nyob rau hauv cov hlau ntau lawm ua cov hlua tiv thaiv rau cov ladles, refining furnaces, thiab tswj cov ntws ntawm cov hlau molten.
Kev kub siab tiv thaiv oxides yuav tsum tau mus rau qhov chaw ua haujlwm hnyav heev, nrog rau qhov chaw ua haujlwm corrosive thiab kub siab (kua hlau kub siab tshaj 1650 degree). Thaum siv, nws yuav nkag mus rau hauv kev sib cuag nrog molten hlau, pwm slag thiab ntxhib nto. Nrog rau qhov tshwm sim ntawm corrosion thiab hnav, nws yuav muaj kev cuam tshuam loj rau kev ruaj ntseg ntawm cov ntaub ntawv refractory thiab yuav ua rau txo qis hauv kev pab cuam lub neej.
Vim li no, cov khoom siv lub cev thiab tshuaj lom neeg ntawm cov ntaub ntawv siv tau muaj feem cuam tshuam rau kev ruaj ntseg thiab hnav tsis kam ntawm cov ntaub ntawv refractory thaum siv, yog li xaiv cov khoom siv yog qhov tseem ceeb. Feem ntau cov refractories yog tsim los ntawm kev sib xyaw ntawm ntau yam khoom sib txawv, xws li ceramic hmoov (oxides), reactive hlau lossis carbides, qee zaum nrog carbon / graphite flakes raug xaiv los ua cov khoom kawg.
01.Zirconium-mullite Zirconium-mullite (ZM) compound muaj cov khoom zoo heev thiab yog cov khoom siv raw hauv cov khoom siv refractory. Zirconia muaj lub siab melting tsis kam (Tmelting=2, 715 degree) thiab muaj tshwj xeeb corrosion kuj rau slag. Tsis tas li ntawd, ob qho tib si zirconia thiab mullite (Al2O3.SiO2) muaj qis thermal expansion coefficients dua li cov alumina lossis magnesia, yog li ZM yog siv rau hauv cov ntawv thov uas raug rau thermal shock, xws li nruam casting nozzles. Nws yog tsim los ntawm molten zircon xuab zeb (ZrO2.SiO2) thiab alumina (Al2O3) nyob rau hauv ib qho hluav taws xob arc rauv. Tom qab melting, cov kua oxide txias thiab ntshiab ZrO2 cais los ntawm qis melting point mullite matrix.
02.Brown corundum Brown corundum (BFA) yog siv nyob rau hauv ntau daim ntawv thov refractory xws li refractory bricks, refractory blocks, thiab carbon bonded nozzles rau nruam casting. Bauxite, cov ore siv los tsim alumina thiab txhuas, muaj txhuas hydroxide thiab ntau yam impurities (sodium, titanium, hlau thiab silicon). Vim vanadium ore muaj hematite (Fe2O3), kaolin, anatase (TiO2) thiab ilmenite (FeTiO3).
