Abstract: Compared with single-phase MgO and Y2O3 ceramics, MgO-Y2O3 composite ceramics have higher mechanical properties and good infrared transmission, which meet the requirements of infrared window materials used under extreme conditions. In this paper, the MgO and Y2O3 powders with high specific surface area were prepared by precipitation method and soft template method, respectively, which were mixed by ball milling uniformly, and composite ceramics were prepared by SPS. The effects of different sintering temperatures on the microstructure, density, mechanical, thermal and optical properties of ceramics were mainly explored. The research results showed that the optimal sintering temperature was 1 200 ℃, the density was completely dense, the highest transmittance was 51% (4. 17 μm), the hardness was 10. 31 GPa, the fracture toughness was 2. 54 MPa·m1/2, the Young’ s modulus was 248 GPa, MSP strength was 129 MPa and thermal conductivity at room temperature was 15. 57 W/ (m·K).
Key words: MgO-Y2O3 composite ceramic; ball milling; SPS; infrared window material
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