炭/炭复合材料用SiC-Glass涂层的高温氧化机理

李龙; 曾燮榕; 李贺军; 谢盛辉; 熊信柏; 邹继兆; 唐汉玲

炭/炭复合材料用SiC-Glass涂层的高温氧化机理

李龙^1,2,
曾燮榕^1,2,,
李贺军³,
谢盛辉^1,2,
熊信柏^1,2,
邹继兆³,
唐汉玲³

1.
深圳大学材料学院, 深圳 518060;
2.
深圳大学深圳市特种功能材料重点实验室, 深圳 518060;
3.
西北工业大学材料学院, 西安 710072

基金项目: 国家自然科学基金(50672059); 广东省自然科学基金(021299)

详细信息

通讯作者:
曾燮榕, 教授, 博士生导师, 主要从事碳基和陶瓷基复合材料研究 E-mail: zengxier@szu.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2006-11-21
- 修回日期: 2007-05-08
- 刊出日期: 2007-10-15

Oxidation mechanism of SiC-Glass coating for protecting carbon/carbon composites from oxidation at high temperatures

1.
College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China;
2.
Shenzhen Key Laboratory of Special Functional Materials, Shenzhen University, Shenzhen 518060, China;
3.
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China

More Information

Corresponding author: ZENG Xierong

摘要

摘要: 采用包埋法和预涂-烧结法相结合的组合工艺在炭/炭(C/C)复合材料表面制得SiC-Glass复合涂层, 并借助X射线衍射仪(XRD)和扫描电镜(SEM)对该复合涂层进行了表征, 研究了涂层C/C试样在不同温度下的氧化动力学规律。结果表明: 复合涂层具有双层结构, 包埋SiC内层由β-SiC相和少量游离硅相组成, 外层由MoSi₂颗粒掺杂的硼硅酸盐玻璃构成; 内外层之间结合紧密; 在1300~1600℃的空气气氛中, SiC-Glass涂层表现出良好的抗氧化性能, 其氧化激活能为118.1kJ/mol, 氧化主要受控于氧在Glass层中的体扩散速率; 在1600℃空气气氛中氧化65h后, SiC-Glass涂层C/C试样的氧化失重率仅为1.02%。
- 炭/炭复合材料 /
- 抗氧化 /
- 涂层
Abstract: An SiC-Glass multi-layer coating was fabricated on the carbon/carbon (C/C) composites by using the pack cementation technique and the precoating-sintering process. The as-prepared multi-layer was characterized by XRD and SEM analyses. The oxidation kinetics of the coated C/C samples was also investigated at different temperatures. The results indicate that the multi-coating is composed of two layers. The inner layer consist of β-SiC phase and a small quantity of silicon phase. The outer layer is a borosilicate glass layer modified by MoSi₂ particles. Additionally, the multi-coating has good interface bonding between the two layers. The experimental data of the oxidation tests show that the SiC-Glass coating exhibits an excellent oxidation resistance in air in the temperature range from 1300℃ to 1600℃, and the oxidation activation energy of the coated C/C is 118.1 kJ/mol. After oxidation at 1600℃ in air for 65 hours, the mass loss of the SiC-Glass coated sample is only 1.02%.
- carbon/carbon composites /
- oxidation resistance /
- coating