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Ablation resistance of monolithic LaB_6-doped ZrC coating for SiC-coated carbon/carbon composites by supersonic atmospheric plasma spray was investigated under an oxyacetylene torch with a heat flux of 4.18 MW/m~2. Result shows that ZrC coating with 10 vol.% LaB_6 has a good ablation resistance compared with pure ZrC, ZrC with 20 vol.% LaB_6 and SiC-doped ZrC coating. After ablation for 15 s, the weight is increased by 1.12 mg/s. The good ablation resistance is ascribed to the formation of a stabilized scale which consists of protective La_2Zr_2O_7-containing molten phase and ZrO_2 particles keeping the integrity of the coating.
Ablation resistance of monolithic LaB_6-doped ZrC coating for SiC-coated carbon / carbon composites by supersonic atmospheric plasma spray was investigated under an oxyacetylene torch with a heat flux of 4.18 MW / m ~ 2. Results show that ZrC coating with 10 vol% LaB_6 has a good ablation resistance compared with pure ZrC, ZrC with 20 vol.% LaB_6 and SiC-doped ZrC coating. After ablation for 15 s, the weight is increased by 1.12 mg / s. The good ablation resistance is ascribed to the formation of a stabilized scale which consists of protective La_2Zr_2O_7-containing molten phase and ZrO_2 particles keeping the integrity of the coating.