How to Improve Thermal Shock Resistance of Refractory Castables

The thermal vibration resistance characteristics of refractory castable materials refer to the raw material’s ability to withstand ultra-low temperature conditions after being subjected to high temperatures for an instant. It refers to the evaluation of the main index value of the damage resistance of the raw material when it withstands large temperature changes. For each test the closer the distance between values, the higher the accuracy.

Conversely, the lower the accuracy, the lower the ability to resist damage. It has been called thermal stability, thermal shock stability, thermal shock resistance, temperature sudden change resistance, rapid cooling and heating resistance, etc.

1. Under the equipment conditions, plus zirconium corundum raw materials, zirconium corundum is an artificial raw material with high wear resistance and heat resistance, high strength, symmetrical expansion, high load softening point, good thermal shock reliability, and high-temperature stress relaxation value. Small, good resistance to organic chemical corrosion and other characteristics.

2. Utilize the difference in linear expansion index between stone and cultivation matrix to balance the thermal vibration properties of refractory castables, reduce the thermal expansion rate of raw materials, try to use materials with lower thermal expansion rates, and increase large stones + low-expansion cultivation matrix to form good resistance. Thermal vibration.

3. Thermal vibration properties of refractory casting materials are very important. Heating furnaces with strong wear capabilities and high load adjustment capabilities, such as circulating system fluidized bed boilers, are in great need of thermal shock-resistant refractory casting materials. It avoids thermal expansion and cold contraction during high-temperature operation, as well as expansion lining collapse and cracking.