莫来石纤维增强氧化铝基复合材料的微观结构及力学性能评价

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Microstructure and mechanical properties of mullite fiber reinforced alumina matrix composites

1， ²， ，ZHU Baoxin 1 ， XIA Xufeng³， JIANG Liping1，WEI Qihongl，WANGHongsheng'，QI Kaiyu'，GAO Wenqiul （1.Shandong Industrial Ceramics Research Co.Ltd.， Zibo 255000;

2.Army nt's Military Representative Bureau in Nanjing Area，Zibo 255000;

3.China Institute of Air-to-air Missile，Beijing 100000）

Abstract：Inthis study，mulite fiber-reinforced alumina composites were preparedby multiple staining of aluminite solgelatinization-high-temperature heat treatment using mulite2.5Dfiber fabric as thereinforcemen，and the densityof the material was 2.14g/cm3 . The sintering characteristics of alumina sol were studied， and αa-Al203 was formed at 1000∘C ，with a volume shrinkageof 57.2% . According to the analysis of the microstructureand mechanical properties of the material，the fracture mode is mainly ductile fracture，and the bending strength is 82.1 MPa.

Keywords： mullite fiber; sol-gel method;aluminium oxide;ceramic composite;

1引言

陶瓷材料具有较高的力学性能、优异的高温稳定性、抗氧化与耐腐蚀性，在航空航天发动机热端部件、高超音速飞行器热防护系统、军工装备等尖端领域有广泛应用[1-4]。（剩余3919字）