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微氧化对反应烧结碳化硅结构与性能的影响
作者:李双1 谢志鹏2 张宇民3 田贵山1 
单位:1. 山东理工大学资源与环境工程学院 山东 淄博 255049  2. 清华大学材料学院 新型陶瓷与精细工艺国家重点实验室 北京 100084  3. 哈尔滨工业大学航天学院 复合材料与结构研究所 哈尔滨 150001 
关键词:氧化 复合材料 力学性能 碳化硅 
分类号:TB332
出版年,卷(期):页码:2015,43(12):1679-1685
DOI:10.14062/j.issn.0454-5648.2015.12.01
摘要:

以短切碳纤维为增强体,采用注浆成型和熔融硅渗透法制备了短纤维增强反应烧结碳化硅陶瓷,研究了微氧化对反应烧结碳化硅复合材料结构与性能的影响。结果表明,1 100 微氧化处理,使反应烧结碳化硅复合材料表面形成了致密氧化硅薄膜、表面游离硅升华,同时,短纤维体积明显增加。微氧化处理使二氧化硅薄膜晶化产生方石英相,且方石英相含量随短纤维含量的增加而减少。微氧化产生的氧化硅薄膜能弥合材料表面微缺陷,当短纤维体积含量为30%时,反应烧结碳化硅的断裂韧性增加到5.8 MPa·m0.5

 

Reaction bonded silicon carbide (RBSC) ceramics were prepared by a combination of slip casting and liquid silicon infiltration, with random chopped carbon fiber as reinforcement. Four specimens with fiber contents in the range of 10 to 40 % were investigated. In this study, the influence of mild oxidation on the microstructure and mechanical properties of random chopped fiber reinforced RBSC composite has been evaluated. The mild oxidation treatment led to the formation of silica layer, the gasification of liquid silicon and the oxidation of chopped fiber. The siliconized fiber underwent an obvious volume expansion during oxidation compared with that of the RBSC matrix. Crystallization of silica occurred at 1 100 ℃ on the material surface, and the fraction of cristobalite phase decreased with the increase of fiber fraction. Due to the microstructure evolution, a maximum fracture toughness of 5.8 MPa·m0.5 was gained at the fiber content of 30%.

基金项目:
国家自然科学基金青年基金(51502120)资助。
作者简介:
第一作者:李 双(1 981—),男,博士,讲师。
参考文献:

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