Talking about the performance characteristics of mullite insulation brick

 
High alumina refractory with mullite (3AI203 ● 2SiO2) as the main crystal phase.
  -Like alumina
The content is between 65% and 75%. Mineral composition In addition to mullite, the lower alumina contains a small amount of glass phase and cristobalite; the higher alumina contains a small amount of corundum. Mullite bricks have a high fire resistance, which can reach above 1790 ° C. The load softening start temperature is 1600 ~ 1700 ° C. The compressive strength at room temperature is 70 ~ 260MPa. Good thermal shock resistance. There are two types of sintered mullite bricks and fused mullite bricks.
 
Sintered mullite bricks use high alumina bauxite as the main raw material, and add a small amount of clay or raw alumina as the raw material.
The binder is made by molding and firing. The fused mullite brick is made of high alumina, industrial alumina and refractory clay, and is added with charcoal or coke fine particles as a reducing agent. After molding, it is manufactured by reduction electrofusion method. The fused mullite crystals are larger than the sintered mullite and have better thermal shock resistance than the sintered products. Their high temperature performance is mainly determined by the alumina content and the uniformity of the mullite phase and glass distribution.