Al-Si-C改性C/C复合材料的微结构特征与烧蚀行为

常亚彬; 孙威; 熊翔; 彭铮; 陈招科; 王雅雷; 徐永龙

Al-Si-C改性C/C复合材料的微结构特征与烧蚀行为

中南大学粉末冶金国家重点实验室, 湖南长沙 410083

基金项目: 国家国际科技合作专项（2013DFR50370）；国家自然科学基金（51405522）.

详细信息

作者简介:
常亚彬,硕士研究生.E-mail:143311054@csu.edu.cn

通讯作者:
孙威,博士,副研究员.E-mail:sunweimse@csu.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: 2016-08-03
- 录用日期: 2016-12-26
- 修回日期: 2016-11-10
- 刊出日期: 2016-12-28

Microstructures and ablation properties of Al-Si modified C/C composites produced by the reactive melt infiltration method

State key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Funds: International S & L Cooperation Program of China (2013DFR50370); National Natural Science Foundation of China (51405522).

摘要

摘要: 为了提高C/C复合材料的抗烧蚀性能，采用反应熔渗法制备Al-Si-C改性C/C复合材料，利用X射线衍射仪、扫描电子显微镜、能谱和电子探针分析等手段分析熔剂成分、熔渗温度和气氛等参数对复合材料微观结构的影响。利用氧-乙炔焰烧蚀仪研究Al-Si-C改性C/C复合材料的烧蚀性能、烧蚀行为及机理。结果表明，随着工艺参数不同，反应熔渗法可制备出三类典型的Al-Si-C改性C/C复合材料。在1 500℃，氩气气氛中反应熔渗2 h形成了Al+SiC均质改性C/C复合材料；随着熔渗温度的升高（1 600℃）和熔渗时间的延长（6 h），形成了Al₄SiC₄+SiC改性C/C复合材料；在1 600℃，真空气氛中反应熔渗6 h形成了SiC+Al梯度改性C/C复合材料（Al含量由内到外递减）。三类Al-Si-C改性C/C复合材料显示不同的烧蚀行为，其中，SiC+Al梯度改性C/C复合材料具有最优的抗烧蚀性能，在2 500℃下烧蚀60 s后，样品表面无明显的烧蚀坑，质量烧蚀率分别为-1.0×10^-3 g/s和-1.2×10^-3g/s。
- C/C复合材料 /
- 基体改性 /
- 反应熔渗 /
- Al-Si-C体系 /
- 烧蚀
Abstract: C/C composites with densities around 1.3 g/cm³ were infiltrated with Al and Si powder mixtures to densities of 1.9-2.2 g/cm³ using reactive melt infiltration to improve their anti-ablation properties. The effects of the Si/Al mass ratio, infiltration temperature, time and atmosphere on the microstructures and ablation properties of the modified composites were investigated by XRD, SEM equipped with EDS, electron-probe micro analysis and oxygen-acetylene ablation tests. Results indicate that homogeneous Al+SiC and Al₄SiC₄+SiC were respectively formed in the C/C composites after infiltration at 1 500℃ for 2 h and 1 600℃ for 6 h in argon. A gradient of SiC+Al was formed after treatment at 1 600℃ for 6 h under vacuum with the Al content decreasing from the inside to the outside of the composite. The gradient C/C modified by SiC+Al with a Si/Al ratio of 3 has the best ablation resistance of the three, with a mass ablation rate of -1.0×10^-3 g/s in an ablation test at 2 500℃ for 60 s.
- C/C composite /
- Matrix modification /
- Reactive melt infiltration /
- Al-Si-C system /
- Ablation

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