Non-equimolar-ratio perovskite type high-entropy ceramic and preparation method thereof
Through the non-equimolar ratio design of high-entropy ceramics, the problems of mismatch between the thermal expansion coefficient and high thermal conductivity of perovskite oxide ceramics and metal matrix are solved, and more accurate material performance adjustment and better high temperature stability and mechanical properties are achieved.
Patent Information
- Application Number
- CN202411973784.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-04-01
AI Technical Summary
As a thermal barrier coating material, the existing perovskite oxide ceramics do not match the thermal expansion coefficient of the metal matrix and have high thermal conductivity, which limits its application.
High-entropy ceramics designed with non-equimolar ratios are prepared by mechanical alloying method and pressure-free sintering. The chemical formula is (Ba0.8Me0.2)(Ti0.2Zr0.4Hf0.2Ce0.2)O3, Me=Ca or Sr, and the thermal conductivity, thermal expansion coefficient and thermal capacity of the material are adjusted.
It realizes more precise adjustment of material properties to make it more in line with the needs of thermal barrier coatings, improves the phase stability and long-term service performance of the material in high temperature environments, and improves the mechanical properties and functional characteristics of the coating.