Method for preparing nanometer alumina-coated zirconium oxide (8 mol.% Y2O3) composite ceramic powder

Abstract

The present invention discloses a method for preparing nanometer alumina-coated zirconium oxide (8 mol.% Y2O3) composite ceramic powder. The method comprises: under a reaction condition of the pH value of 5, mixing a silane coupling agent with a mass fraction of 1.0%, a dispersant polyacrylamide (PAM) and zirconium oxide (8mol.% Y2O3), and carrying out ultrasonic stirring to obtain a ZrO2 suspension; adding 20 mL of 6.0 mol.L<-1> ammonia water and 15 g of a AlCl3 solution with a concentration of 0.1 mol.L<-1> to the ZrO2 suspension to carry out a complete reaction, and aging for 2 h; and sequentially carrying out treatments of suction filtration, washing ,drying and calcination on the obtained mixing solution so as to obtain the nanometer alumina-coated zirconium oxide (8 mol.% Y2O3) composite ceramic powder. According to the present invention, the silane coupling agent is adopted to carry out surface modification on zirconium oxide particles and then coat a layer of an alumina precursor, and sintering is performed to obtain the core-shell structure nanometer alumina-coated zirconium oxide multi-phase nanometer powder so as to achieve the purpose of grain growth inhibition during a zirconium oxide powder sintering process.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a method for preparing nano-alumina-coated zirconia (8mol.% Y 2 o 3 ) method of composite ceramic powder. Background technique [0002] Using alumina and zirconia (8mol.%Y 2 o 3 ) powders are directly mixed to obtain multiphase ceramic powders, which are used to prepare thermal barrier coating materials with high temperature protection, which are mainly used on the surface of high temperature parts in the fields of aerospace, aviation, gas power generation, chemical industry and metallurgy. ; The powder can also be directly used to prepare high temperature resistant, oxidation resistant, wear resistant fine structure ceramic composite materials, its wide application has become one of the hotspots in the research field of structural ceramics and coating materials in recent years. [0003] The prior art generally utilizes alumina and zirconia (8mol.% Y 2 o 3 ) po...

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Problems solved by technology

[0003] The prior art generally utilizes alumina and zirconia (8mol.%Y 2 o 3 ) powders are directly mixed to obtain powders of multiphase ceramics. During the sintering process of multiphase ceramics, this method cannot effectively solve the problem of grain growth of zirconia due to phase change characteristics during the sintering process.

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