2023/10/16
Refractory refers to non-metallic materials with physical and chemical properties suitable for use at high temperatures, but it is not excluded that certain products may contain a certain amount of metallic materials (CB/T 18930-2002). Generally refers to the refractoriness of not less than 1580 ℃ inorganic non-metallic materials or products. Refractory materials have an iconic indicator-refractoriness, which refers to the characteristics of refractory materials that resist high temperatures without melting under load conditions. It can also be understood as the temperature at which the refractory material reaches a certain degree of softening under the action of high temperature. It is an indicator of material resistance to high temperature and can be used as a basic guarantee for the use of kilns at high temperatures. In the process of using refractory materials, in addition to being affected by high temperature (generally 1000~1800 ℃), it is also affected by physical, chemical, mechanical and other aspects, such as: bearing the load of furnace body and materials at high temperature; External stress in the operation process; Due to the rapid change of temperature, the great temperature difference caused by uneven heating and the resulting internal stress; Scour of various high temperature fluids, slag and smoke; the erosion of liquid metal, slag and impurity elements, the transformation and function of environmental atmosphere, etc. Therefore, the selection of refractory materials in addition to considering the refractoriness, but also need to consider the nature of the refractory material to fully resist the above effects, so that the refractory material can be applied under various operating conditions as much as possible.
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