A novel Cr-doped Al2O3-SiC-ZrC composite coating for ablative protection of C/C-ZrC-SiC composites

作者：Peng, Zheng; Sun, Wei^*; Xiong, Xiang; Xu, Yonglong; Chen, Yuntian

来源：Journal of the European Ceramic Society, 2018, 38(7): 2897-2902.

DOI：10.1016/j.jeurceramsoc.2018.02.015

• C/C-ZrC-SiC
• Al2O3-SiC-ZrC composite coating
• Cr doped
• Ablation

A novel Cr-doped Al2O3-SiC-ZrC coating systemis proposed to further improve the ablation resistance of C/CZrC-SiC composites. Our approach combines low pressure plasma spray method with slurry impregnation of ZrCr-Si-C to achieve a specially tailored oxide-carbide structure. Results show that the as-prepared coating was dense and crack-free, which effectively promoted the ablation resistance of C/C-ZrC-SiC with the mass and linear ablation rates decreased by 66% and 76% respectively, involving a highly dense protective structure of AlxCr2-xO3-SiO2-ZrO2 formed during ablation. The compact and continuous multi-oxide scale with "ZrO2-rosette" skeleton intricated with A1(1.96)Cr(0.04)O(3) was evidenced in the ablation center.

• 出版日期2018-7
• 单位粉末冶金国家重点实验室; 中南大学