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

A novel Cr-doped Al 2 O 3 -SiC-ZrC coating systemis proposed to further improve the ablation resistance of C/C-ZrC-SiC composites. Our approach combines low pressure plasma spray method with slurry impregnation of Zr-Cr-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 A1 x Cr 2-x O 3 -SiO 2 -ZrO 2 formed during ablation. The compact and continuous multi-oxide scale with “ZrO 2 -rosette” skeleton intricated with A1 1.96 Cr 0.04 O 3 was evidenced in the ablation center. [ABSTRACT FROM AUTHOR]