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Effect of temperature change on refractory brick

Jan. 01, 1970

The tensile strength of all refractory brick is relatively small. Therefore, when the surface is heated, the heated surface expands faster than the inner surface, and the surface is subjected to extrusion pressure, and the inner part is subjected to tension. When the surface is cooled, the opposite is true.

If the stress exceeds the strength limit of the material itself, the material is destroyed. When the temperature is increased, there will be cracks in the interior, while the cooling surface will produce cracks.

Therefore, the sensitivity of refractory bricks to thermal stress and thermal shock damage is one of the main reasons to limit their use. For example, for many high temperature applications, although the structure properties of refractory brick with the structure in the use of temperature, but the damage is often occurred at very high temperatures that occurred in the process of heating and cooling.

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