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Home Page > Industry dynamics Is it really useful to use mullite to improve the thermal shock resistance of corundum castables?
Is it really useful to use mullite to improve the thermal shock resistance of corundum castables?
Add time: 2019/5/7 9:18:27 browsing: 735 times

With the development of science and technology, amorphous refractories are developing faster and faster. Corundum castable Corundum castables have always attracted the attention of many customers because of their high aluminum content. However, corundum castables are good, but there is a very puzzling shortcoming. That is, the thermal shock resistance of corundum castables is not so good. However, when the height of the corundum castables is high, the heat resistance of corundum castables is not good, so the manufacturers begin to think of ways to increase corundum. The thermal shock resistance of castables is more common than that of mullite castable when mullite is prepared. Is it really useful to improve the thermal shock resistance of this corundum castable?
Speaking of Corundum castable For thermal shock resistance, let's start with what is thermal shock resistance. Heat resistance refers to the ability of fire-resistant materials to resist damage caused by rapid temperature changes. It has been described as thermal shock resistance, heat resistance, thermal shock resistance, quick cooling and hot resistance. In testing the thermal shock resistance of castables, it can be determined according to different requirements and product types according to the corresponding test methods. The main test methods are: black metallurgy standard YB/T 376.1 - 1995 refractory products thermal resistance test method (water quench method), ferrous metallurgy standard YB/T 376.2 - 1995 thermal shock test method for refractory products (air quenching method), ferrous metallurgy standard YB/T 376.3 - 2004, refractory products, thermal shock resistance test method (water quenching method), ferrous metallurgy standard YB/T 2206.1 - 1998 thermal shock resistance test method for refractory castables (compressed air flow quenching method), ferrous metallurgy standard YB/T 2206. 2 - 1998 test method for thermal shock resistance of refractory castables (water quench method).
and Corundum castable The mechanical and thermal properties, such as strength, fracture energy, elastic modulus, linear expansion coefficient and thermal conductivity, are the main factors affecting the thermal shock resistance. Generally speaking, the linear expansion coefficient of refractories is small, and the thermal shock resistance is better. The thermal conductivity (or thermal diffusivity) of the material is high, and the thermal shock resistance is better. In addition, the particle composition, density, pore size, stomatal distribution, and shape of the refractory affect their thermal shock resistance. A certain number of micro cracks and pores are stored in the material, which is beneficial to its thermal shock resistance. The large size and complex structure of the products will result in serious uneven temperature distribution and stress concentration, and reduce thermal shock resistance.

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