Foundation item:National Natural Science Foundation of China(51405522) . Corresponding author:SUN Wei,Ph. D,Research Associate Professor. E鄄mail:sunweimse@ csu. edu. cn Author introduction: PENG Zheng, Master Student. E鄄mail:360272308@ qq. com
彭摇 峥,摇 孙摇 威,摇 熊摇 翔,摇 陈招科,摇 王雅雷,摇 徐永龙
( 中南大学 粉末冶金国家重点实验室,湖南 长沙 410083)
摘摇 要:摇 结合低压等离子喷涂和料浆法,在 C / C鄄ZrC鄄SiC 复合材料表面制备新型多元氧化物鄄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
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,Al1. 96 Cr0. 04 O3 鄄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。
关键词:摇 C / C鄄ZrC鄄SiC;Al1. 92 Cr0. 08 O3 鄄SiC鄄ZrC;陶瓷涂层;烧蚀
中图分类号: 摇 TB332
( State key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
Abstract: 摇 A novel oxide鄄carbide coating system was achieved on a C / C鄄ZrC鄄SiC composite surface by low鄄pressure plasma spra鄄 ying 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鄄acetylene environment at temperatures up to 2500 益 for 120 s. The results show that the C / C鄄ZrC鄄SiC substrate coated with the Al1. 92 Cr0. 08 O3 鄄SiC鄄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鄄stability efficiency of Cr2 O3 provide and explanation for the reduction of the volatilization of SiO2 and Al2 O3 at high temperature. Continuous and robust multi鄄oxide scales on the surface comprised of ZrO2 grain skeletons and molten Al1. 96 Cr0. 04 O3 鄄SiO2 cause the superior anti鄄ablation property. Key words:摇 C / C鄄ZrC鄄SiC;Al1. 92 Cr0. 08 O3 鄄SiC鄄ZrC;Ceramic coating;Ablation