Explanation

ceramics with mullite as the main component. mullite ceramics mainly include ordinary mullite ceramics and high-purity mullite ceramics. Ordinary mullite porcelain is made of aluminosilicate natural minerals as the main raw materials by the reaction sintering method of mullitization in the sintering process, or by synthesizing mullite first, then molding and sintering. Due to the low purity of raw materials and high impurity appetite, its components contain TiO2, Fe2O3, CaO, MgO, Na2O, K20 and other impurities in addition to Al2O3 and SiO2, so there is a considerable amount of glass phase in the product, resulting in poor mechanical and thermal properties. It is generally used as a general refractory in places where temperature and high temperature strength are not required. High purity mullite ceramics are ceramics prepared by reaction sintering of high-purity Al2O3 powder and high-purity SiO2 powder or by synthesizing ultra-fine high-purity mullite powder. It is characterized by uniform expansion, excellent thermal shock resistance, high load softening point, low high temperature creep value, high hardness, good chemical corrosion resistance, etc. This kind of strength and toughness not only do not decay but increase significantly with temperature, which is an excellent characteristic of high-purity mullite ceramics as high temperature materials. High purity mullite ceramics can be used as refractory, high-temperature structural materials, electronic packaging materials and optical window materials

Classification