Production and performance characteristics of mullite tiles

Mullite brick is a refractory material made of synthetic mullite as the main raw material with mullite as the main crystal phase. This article will introduce the production and performance characteristics of mullite bricks.

High temperature firing

Mullite bricks are made of electrofused synthetic mullite as raw material, the firing temperature should be higher than 1700℃, and the firing temperature of sintered mullite raw material is 1550-1600℃.

Various production processes

The production of sintered zirconium mullite bricks has two production processes: one is to complete the reaction sintering in the process of making refractory bricks to get the microstructure of the complete phase transformation; the second is to partially transform the phase to maintain the non-equilibrium phase combination.

High-temperature mechanical properties

Mullite ceramics have many good properties, such as high temperature resistance, thermal shock resistance, high temperature creep resistance and good chemical stability and other good properties. Introducing ZrO2 into mullite ceramics and utilizing the phase transition toughening of ZrO2 can greatly improve the high temperature mechanical properties of mullite materials.

A variety of combination forms

In addition to mullite and its composition with corundum composite refractory bricks, mullite can also be composed of refractory bricks with other materials to improve its performance, such as zirconium mullite refractory bricks, mullite - silicon carbide refractory bricks and so on.

The influence of impurity oxides

Mullite bricks generally contain TiO2, Fe2O3, CaO, MgO, K2O, Na2O and other impurity oxides, natural raw materials produced by mullite than synthetic raw materials with high content. These impurity oxides in mullite play the role of melting agent, reduce the formation temperature and viscosity of the melting liquid, increase the amount of liquid phase production, improve the melting liquid on the solid phase of the dissolution rate and dissolution.