Mullite insulation brick is a high-quality refractory material widely used in emerging industries. It has uniform expansion, excellent thermal shock stability, high softening temperature under load, small high-temperature creep value, high hardness, and chemical resistance Classification of mullite insulation bricks: According to the different density, mullite insulation bricks are mainly classified into light and heavy mullite bricks.
Performance and application of mullite insulation brick: High fire resistance, up to 1790 ℃. Softening temperature under load is 1600 ~ 1700 ℃. The compressive strength at room temperature is 70 ～ 260MPa. Good thermal shock resistance.
There are two types of mullite insulation bricks: sintered mullite bricks and fused mullite bricks. The sintered mullite brick is made of high alumina bauxite clinker, and a small amount of clay or raw alumina is added as a binder, and then formed and fired. The fused mullite brick is made of high alumina bauxite, industrial alumina and refractory clay, and fine particles of charcoal or coke are added 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. The high temperature performance of mullite insulation bricks mainly depends on the content of alumina and the uniformity of the distribution of mullite phase and glass phase. Mullite insulation bricks are mainly used in hot blast stove tops, blast furnace bodies and bottoms, glass melting furnace regenerators, ceramic sintering kiln, and angle furnace linings for petroleum cracking systems.
Next issue we will continue to introduce characteristics of mullie insulation bricks. Please stay tuned.