Ablation resistance of (Hf1/3Zr1/3Ta1/3)C solid solution ceramic coating for carbon/carbon composites at 2100 ° C

Multicomponent solid solution ceramics have attracted extensive attention for their superior ablation resistance and high-temperature resistance, which are expected to extend the service life of carbon/carbon (C/C) composites under an ablation environment above 2000 degrees C. Herein, we synthesized (Hf 1 / 3Zr 1 / 3Ta 1 / 3)C solid solution ceramic powders via carbothermal reduction. Then a dense (Hf1/3Zr1/3Ta1/3)C 1 / 3Zr 1 / 3Ta 1 / 3)C solid solution ceramic coating was deposited on SiC-coated C/C composites by supersonic atmospheric plasma spraying. The coated samples exhibited a low linear ablation rate of- 0.61 mu m/s after ablation for 120 s, mainly associated with the formation of a compact oxide scale consisting of (Hf, Zr)6Ta2O17 6 Ta 2 O 17 and (Hf, Zr)O2. 2 . The refractory (Hf, Zr)O2 2 skeleton structure possessed good thermal endurance, and the Ta-rich oxide melt filled the defects of the skeleton.