Special oxide refractory products include alumina, lanthanum oxide, beryllium oxide, calcium oxide, zirconium oxide, uranium oxide, magnesium oxide, cerium oxide and thorium oxide. The melting point is 2050~3050℃.
Special composite refractory products include carbides (silicon carbide, titanium carbide, tantalum carbide, etc. ), nitride (boron nitride, silicon nitride, etc. ), borides (zirconium boride, titanium boride, hafnium boride, etc. ), silicide (molybdenum disilicide, etc. ) and sulfide (thorium sulfide, cerium sulfide, etc. Their melting point is 2000~3887℃, and the most refractory is carbide.
brief introduction
Refractory materials are composed of various minerals, each of which has its own melting point. At high temperature, they either exist or generate third-party minerals, resulting in low melting temperature. Refractory refers to the temperature in the low * * * melting state, but higher than the low * * * melting temperature. The higher the fire resistance index. The results show that the refractories with better high temperature resistance can be divided into three grades according to the refractoriness index: ordinary, advanced and super grade.