Ablation behavior of (Zr,Ta)B2-SiC coating on carbon/carbon composites at 2300 °C

Zr-Ta-B-SiC multiphase coating was prepared on carbon/carbon composites by pack cementation and slurry method. The (Zr,Ta)B-2 solid solution was found to be the key antiablative component. The ablation behavior suggested that the synthesized Zr0.70Ta0.30B2-SiC coating exhibited the best ablation resistance at 2300 degrees C. It is asserted that the micromorphology and distribution of Zr-Ta-O in the coating played a vital role in the evolution of the protective layer and ablation performance. A coating with similar to 30 % Ta was beneficial for stabilizing the t-ZrO2 phase and alleviating the volume change at high temperature. The formation of a thermal barrier and low volatility of Zr-Ta-O layer were responsible for the excellent ablation resistance.

Automated summary

The Zr-Ta-B-SiC multiphase coating prepared on carbon/carbon composites exhibited excellent ablation resistance at high temperatures, with the key antiablative component being the (Zr,Ta)B-2 solid solution. The micromorphology and distribution of Zr-Ta-O in the coating played a vital role in protective layer evolution and ablation performance, with a coating containing around 30% Ta beneficial for stabilizing the t-ZrO2 phase and alleviating volume change. The formation of a thermal barrier and low volatility of the Zr-Ta-O layer were responsible for the coating's outstanding ablation resistance.