Thermal shock resistance of refractory castables

Refractory castables are attracting more and more attention from customers, but they are often affected by the ambient temperature during use and undergo drastic changes. The thermal shock resistance of the castables reflects its value. Its thermal shock resistance is an important indicator for measuring the breakage resistance of the castables. It is the ability to counteract the loss caused by rapid changes in temperature during the use of the castables.

As a characteristic of refractory materials, thermal shock resistance has the characteristics of small bulk density, long service life and easy construction. Refractory castables composed of particles have a certain number of cracks and pores in the material, but there are uncertainties. There are many factors that affect it. Generally speaking, the greater the linear expansion coefficient of refractory castables, the lower the thermal shock resistance. The lower the thermal conductivity of the material, the lower the thermal shock resistance.

Methods to improve the thermal shock resistance of castables:

1. Adding mullite when using castables can effectively improve the wear resistance and heat resistance of the castables and achieve extremely high thermal stability.
2. Use the difference in expansion coefficients between orthopedic and matrix lines to balance the seismic resistance of the castable.