A testing method of thermal shock resistance of refractories

Abstract

A testing method of thermal shock resistance of refractories is disclosed, and the method is characterized by following steps: preparing a test specimen, and making the to-be-tested test specimen into a crucible shape; preparing fuel powder, metal aluminium powder, iron oxide powder, magnesium rods, potassium chlorate and grains of sand; evenly mixing the metal aluminium powder and the iron oxide powder according to the mass ratio of 1:2.5~3.5, putting the mixture powder into the inner cavity of the specimen, with the loading quantity being such that the powder reaches 1 / 2-1 of the depth of the inner cavity, and then adding an appropriate amount of the potassium chlorate on the mixture powder; selecting a magnesium rod of appropriate length and inserting the magnesium rod into the mixture, and putting the prepared test specimen into the grains of sand; lighting the magnesium rod, waiting for full reaction, cooling the specimen naturally, observing the surface and the interior of the specimen after cooling, recording the information of cracking, quantity and width of cracks, etc, and using the above information as an evaluation basis of thermal shock resistance; fifthly, conducting preliminary evaluation according to the recorded information, and using the cracks to represent the thermal shock resistance of the material. The method is wide in application range, is easy and convenient to operate and is of great practical application value.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a method for testing the thermal shock stability of refractory materials, in particular to a method for testing the thermal shock stability of inorganic non-metallic refractory materials. Background technique [0002] As a kind of manufacturing material used at high temperature, refractory materials must not only withstand high temperature during use, but also resist damage from sudden changes in temperature, and the ability of materials to resist sudden changes in temperature without damage is called refractory Thermal shock stability of materials. Thermal shock damage is one of the two main damage causes of refractory materials, and its performance is crucial to the use of refractory materials. [0003] The thermal stress of refractory materials mainly comes from two aspects. On the one hand, due to the temperature gradient from the surface of the refractory material to the...

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Problems solved by technology

[0005] These commonly used test methods all require high-temperature heating equipment to provide a thermal shock environment and a fixed experimental environment. Therefore, they need to consume a lot of energy and are limited by experimental conditions.

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