Abstract
To improve the ablation resistance of carbon/carbon (C/C) composites, ZrC-La2O3 coating was prepared on SiC-coated C/C composites by supersonic atmosphere plasma spraying. Ablation resistance of the coating was evaluated under an oxyacetylene torch with a heat flux of 4.2MW/m2. The coating shows a significant improvement on the ablation resistance compared with monophase ZrC coating and ZrC coating with LaB6. The good ablation resistance of the coating is mainly attributed to the formation of dense and high-viscosity scale surface which is beneficial to reducing the infiltration of oxygen and resisting the scouring from the flame during ablation. The positive effect of La2O3 is to improve the compactness of the scale surface during ablation.
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