反应烧结制备碳化硅增强石墨复合材料及其性能

韩永军; 李青彬; 燕青芝; 唐睿

反应烧结制备碳化硅增强石墨复合材料及其性能

韩永军^1,2,
李青彬^1,2,
燕青芝^1,,
唐睿³

1.
北京科技大学特种陶瓷粉末冶金研究室, 北京100083;
2.
平顶山学院化学化工学院, 河南平顶山467000;
3.
中国核动力研究设计院核燃料及材料国家重点实验室, 四川成都610041

基金项目: 国家自然科学基金(U1134102).

详细信息

作者简介:
韩永军.E-mail:hyj73@126.com

通讯作者:
燕青芝,博士,教授.E-mail:qzyan@ustb.edu.cn

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2014-10-10
- 录用日期: 2015-02-13
- 修回日期: 2015-01-22
- 刊出日期: 2015-02-28

Properties of silicon carbide-reinforced graphite composites prepared by a reactive sintering method

1.
Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2.
School of Chemistry and Chemical Engineering, Pingdingshan University, Pingdingshan 467000, China;
3.
Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610041, China

Funds: National Natural Science Foundation of China (U1134102).

摘要

摘要: 以鳞片石墨和硅粉为混合原料,采用真空热压烧结工艺制备碳化硅增强石墨基复合材料。考察原料中硅粉含量对复合材料性能和结构的影响。XRD与SEM分析表明,经1900℃热压烧结后,硅粉与石墨发生原位反应生成碳化硅强化相,形成的碳化硅均匀分散在石墨片层间。随着硅质量分数从28.06%提高到37.94%,复合材料的弯曲强度从112MPa提高至206MPa。此外,当硅含量低于31.46%时,复合材料的摩擦系数恒定为0.1,与纯石墨的摩擦系数相当。
- 石墨基复合材料 /
- 反应烧结 /
- 碳化硅增强 /
- 摩擦系数
Abstract: Silicon carbide-reinforced graphite composites were prepared by hot-pressing mixtures of flake graphite and Si powder with various mass ratios under vacuum. The microstructure and phase compositions were characterized by SEM and XRD. Results indicated that SiC, resulting from the reaction between graphite and silicon, was uniformly dispersed in the graphite matrix. The bend strength of the composites increased from 112 to 206 MPa with increasing silicon content from 28.06 to 37.94 mass%. The oxidation resistance of the composites increased with their silicon content. The coefficient of friction of the composites remainedat a low constant value of about 0.1 when the Si content was below 31.46 mass%.
- Graphite composite /
- Reactive sintering /
- SiC particle reinforced /
- Friction coefficient

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