Al1.92Cr0.08O3-SiC-ZrC耐烧蚀复合涂层微结构与烧蚀行为

彭峥; 孙威; 熊翔; 陈招科; 王雅雷; 徐永龙

Al_1.92Cr_0.08O₃-SiC-ZrC耐烧蚀复合涂层微结构与烧蚀行为

中南大学粉末冶金国家重点实验室, 湖南长沙 410083

基金项目: 国家自然科学基金（51405522）.

详细信息

作者简介:
彭峥,硕士研究生.E-mail:360272308@qq.com

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: 2019-08-12
- 录用日期: 2019-11-04
- 修回日期: 2019-10-08
- 刊出日期: 2019-10-28

Microstructure characteristics and ablation behavior of an Al_1.92Cr_0.08O₃-SiC-ZrC anti-ablation coating

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

Funds: National Natural Science Foundation of China(51405522).

摘要

摘要: 结合低压等离子喷涂和料浆法，在C/C-ZrC-SiC复合材料表面制备新型多元氧化物-碳化物复合陶瓷涂层，并通过掺杂过渡元素Cr来提升涂层整体热稳定性能。采用XRD和SEM等手段分析复合涂层的相组成和微观结构，并研究所制复合陶瓷涂层在2 500℃氧乙炔烧蚀环境中的协同抗氧化烧蚀行为。结果显示，有Al_1.92Cr_0.08O₃-SiC-ZrC复合涂层保护的样品烧蚀性能相比于无涂层的C/C-ZrC-SiC基体有明显提升，烧蚀120 s后的质量烧蚀率和线烧蚀率分别下降了66%和76%。烧蚀后样品表面形成了独特稳定的复合多元氧化物防护结构，其高熔点ZrO₂骨架，Al_1.96Cr_0.04O₃-SiO₂熔融相弥合其中的连续结构赋予了复合材料较好的抗烧蚀能力。
- C/C-ZrC-SiC /
- Al_1.92Cr_0.08O₃-SiC-ZrC /
- 陶瓷涂层 /
- 烧蚀
Abstract: A novel oxide-carbide coating system was achieved on a C/C-ZrC-SiC composite surface by low-pressure plasma spraying and a slurry method, with Cr doping to improve the thermal stability of the coating. The phase compositions and microstructure characteristics of composites were characterized by XRD, SEM and EDS. The ablation properties were tested in an oxy-acetylene environment at temperatures up to 2500℃ for 120 s. The results show that the C/C-ZrC-SiC substrate coated with the Al_1.92Cr_0.08O₃-SiC-ZrC coating exhibits a significant improvement in ablation resistance, with the mass and linear ablation rates decreased by 66% and 76% respectively. This is caused by the highly dense and stable protective structure formed during ablation. The pinning effect of the ZrO₂ phase and the thermal-stability efficiency of Cr₂O₃ provide and explanation for the reduction of the volatilization of SiO₂ and Al₂O₃ at high temperature. Continuous and robust multi-oxide scales on the surface comprised of ZrO₂ grain skeletons and molten Al_1.96Cr_0.04O₃-SiO₂ cause the superior anti-ablation property.
- C/C-ZrC-SiC /
- Al_1.92Cr_0.08O₃-SiC-ZrC /
- Ceramic coating /
- Ablation

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