Refractories are generally composed of a number of body

Wherein the mineral phase can be divided into two categories , i.e. the crystal phase and the glass phase .
The main phase is the main structure of the products constituting the crystalline phase and the higher melting point . Nature of the main phase , during which the number and combination of state Fused zirconia mullite directly determines the nature of the products .
Matrix is the large crystals of the refractory aggregate or substances present in the gap . Matrix on the nature of products ( such as high temperature resistance characteristics and resistance to invasion ornaments ) plays a decisive impact. When using the products, often starting with damage from the matrix section , the use of adjustments and changes in matrix components products are effective measures to improve product White fused aluminum oxide  performance process .
The vast majority of refractory products ( except for a few extra high refractory products outside ) , their main phase and matrix components can be divided into two categories : one is a multi-component refractory products containing crystalline phase and glass phase , such as clay , silica bricks ; Another multi-ingredient products containing only crystalline phase , mostly fine matrix crystals, such as brick, chrome magnesia brick and other basic refractories . These articles in high temperature firing , a certain amount of liquid , but does not form a liquid phase upon cooling the glass , but the formation of a crystalline matrix , the main crystal phase cemented together , the matrix component is different from the main phase crystal .
Microstructure There are two types of refractory products . A is a silicate ( silicate mineral crystal or vitreous ) binding was cemented type crystal particles , the crystal particles from the other is directly integrated into the crystalline network interlace , e.g. purity brick, this type of structure directly bonded high temperature properties ( temperature mechanical strength , slag resistance or thermal shock resistance , etc. ) products far superior than the previous one ; therefore have to have broad prospects for development .