Low-density high-thermal-shock-resistance composite ceramic powder and preparation method thereof

Abstract

The invention discloses low-density high-thermal-shock-resistance composite ceramic powder and a preparation method thereof. The composite ceramic powder comprises the following components in percentages by mass: 80-95% of mullite powder, 0-5% of silicon carbide powder, 0-5% of silicon dioxide powder, 0-2% of zirconium oxide powder and 0-10% of cordierite powder. The nano mullite-cordierite powderis taken as a matrix, zirconium oxide, silicon carbide and silicon dioxide are added into the nano mullite-cordierite powder, the cordierite has effects of reducing the linear expansion coefficient of the material and improving the thermal conductivity of the material, the silicon carbide improves the thermal conductivity, and the zirconium oxide has effect of improving the toughness of the composite ceramic, so that the thermal-shock-resistance low-density composite ceramic material is obtained.

Description

[0001] Technical field: [0002] The invention relates to the technical field of ceramic preparation, and more specifically relates to a low-density high thermal shock resistance composite ceramic powder and a preparation method thereof. [0003] Background technique: [0004] The ability of a material to resist damage under conditions of rapid temperature changes. It was once called thermal stability, thermal shock stability, thermal shock resistance, temperature abrupt change resistance, rapid cooling and rapid heat resistance, etc. [0005] Refractory materials are brittle materials at low and medium temperatures and lack ductility. In the use of thermal equipment, they are often subjected to sharp temperature changes, resulting in damage. Thermal shock resistance is one of the important performances of refractories [0006] Alumina-based ceramic materials have the advantages of large elastic modulus, high strength, high hardness, high temperature oxidation resistance, lig...

AI Technical Summary

Problems solved by technology

[0010] Take each raw material, binder, dispersant, and defoamer, and grind them in a high-speed stirring mill for 2 to 4 hours. The dispersion medium is deionized water, and the grinding medium is high-purity alumina ceramic balls or zirconia ceramic balls. Uniform slurry; the weight percentage of each raw material is: α-alumina micropowder 67.7~84.6%, tabular corundum 5~10%, fused mullite powder 8~15%, magnesium oxide 0.1~0.5%, kaolin 1% ~3%, calcium carbonate 0.3~0.8%, zirconia 1~3%; the particle size of the α-alumina micropowder, magnesium oxide, and calcium carbonate is 4~5 microns, and the particle size of zirconia is 1~2 microns. The particle size of corundum and fused mullite powder is 200 mesh. This technical solution adopts spray drying and direct isostatic pressing, resulting in dense green body, and it is difficult to prepare low-density and high thermal shock resistance composite ceramic materials.