Preparation method of composite ceramic powder material for high-temperature-resistant sintering thermal barrier coating

Abstract

The invention discloses a preparation method of a composite ceramic powder material for a high-temperature-resistant sintering thermal barrier coating. The powder material is prepared by codoping ZrO2 in three rare earth oxides Y2O3, Yb2O3 and Gd2O3 in a chemical reaction method, and Y2O3, Yb2O3, Gd2O3 and ZrO2 are completely solidified and compounded. The composite ceramic power material subjected to ball milling, agglomeration and granulation and sintering can be used for preparing a thermal barrier coating through plasma spraying or can be compressed into a bar material to prepare a thermal barrier coating by electron beam physical vapor deposition. The thermal barrier coating is high-temperature sintering resistant, is stable in phase structure, is low in heat conductivity, can achieve the working temperature of 1450 DEG C, and can be used for high-temperature thermal-insulation protection of aircraft engines and hot end parts of ground surface combustion gas turbines.

Description

technical field [0001] The invention is a method for preparing a composite ceramic powder material for a high-temperature sintering-resistant thermal barrier coating, [0002] The invention belongs to the technical field of preparation of oxide ceramic materials. Background technique [0003] Thermal barrier coatings are generally prepared by plasma spraying or electron beam physical vapor deposition of oxide ceramic materials. The working environment of thermal barrier coating is harsh - high temperature, oxidizing environment, gas erosion. The microstructure and phase structure stability of the coating material at high temperature directly affect the stress magnitude and distribution state in the thermal barrier coating, which is closely related to the service life of the component. Once the coating material is sintered at high temperature, the coating structure will be densified, resulting in an increase in the elastic modulus of the coating, an increase in stress, and ...

AI Technical Summary

Problems solved by technology

The currently widely used thermal barrier coating material is a single Y 2 o 3 Stable ZrO 2 Ceramic materials, the long-term working temperature of the thermal barrier coating made of this material should not exceed 1200 °C, and the coating will undergo a transformation from tetragonal phase to monoclinic phase when it is cooled to room temperature when the temperature exceeds 1200 °C, and this phase transition will cause the volume of the coating to expand up to 3-4%, resulting in cracking and peeling off of the thermal barrier coating, and even causing high-temperature burnout of the hot end parts of the engine; and a single Y 2 o 3 Stable ZrO 2 Ceramic materials are particularly easy to sinter at temperatures above 1200°C, resulting in densification of the coating structure, a decrease in heat insulation capacity, an increase in stress, and a decrease in the service life of the coating, which seriously affects the safety of the engine.

[0005] At present, the means to solve the high temperature (above 1200°C) microstructure and phase structure stability of thermal barrier coatings is generally to use a variety of rare earth oxide doped zirconia materials, and the preparation of various rare earth oxide doped zirconia mostly uses a variety of The solid-phase synthesis method is a solid-phase synthesis method of mechanical ball milling and high-temperature sintering after direct mixing of rare earth oxides and zirconia. Above) the structural structure and phase structure stability of thermal barrier coatings are difficult to meet the design requirements