4 indicators that determine the high temperature performance of refractory materials



During use, refractory materials are subject to physical, chemical, and mechanical effects at high temperatures (usually 1000~1800C), which are easy to melt and soften, or are corroded, abraded, or cracked and damaged, causing the operation to be interrupted and stained contaminated materials. 

The following are 4 indicators that determine the high temperature performance of refractory materials:

 (1) Refractoriness .

Refractoriness refers to the temperature at which a material reaches a certain degree of softening under the action of high temperature, which characterizes the performance of the material against high temperature. Refractoriness is the basis for judging whether a material can be used as a refractory material. The International Organization for Standardization stipulates that inorganic non-metallic materials with a refractoriness above 1500°C are refractory materials. It is different from the melting point of the material, and it is a comprehensive performance of a mixture of multiphase solids composed of various minerals.

 (2) Deformation temperature under high temperature load.

It also known as the refractory softening point under load or the refractory deformation temperature under load, it means the resistance of the refractory to the combined action of high temperature and load under a constant load or the temperature range in which the refractory exhibits significant plastic deformation. The maximum use temperature of the refractory material can be inferred from its softening temperature under load. 

(3) High temperature volume stability of refractories.

Refractory materials produce volume expansion under the action of high temperature for a long time, which is called residual expansion. The size of the residual expansion (deformation) of refractory materials reflects the quality of high-temperature volume stability. The smaller the residual deformation, the better the volume stability; on the contrary, the worse the volume stability, the easier it is to cause deformation or damage to the masonry.

 (4) Thermal shock stability.

The ability of refractory materials to resist sudden changes in temperature without being damaged is called thermal shock stability. This performance is also called thermal shock resistance or temperature sudden change resistance. Generally speaking, the greater the linear expansion rate of the material, the worse the thermal shock stability; The higher the thermal conductivity of the material, the better the thermal shock stability. In addition, the structure of the refractory material, the particle composition and the shape of the material all have an impact on the thermal shock stability.

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