Abstract

An intermediate ZrC-TaC layer was incorporated into the (Hf, Zr)C/SiC coating to enhance its ablation resistance at high temperatures. The impact of this intermediate layer on the ablation resistance and mechanism of the (Zr, Hf)C solid solution coating was analyzed at a temperature of 2700 °C. Due to the formation of gradient multi-layer structure of the (Hf, Zr)C/ZrC-TaC/SiC coating, (Hf, Zr)C/ZrC-TaC/SiC triple-layer coating exhibits superior ablative property than (Hf, Zr)C/SiC double-layer coating. After 20 s ablation at about 2700 °C, the linear and mass ablation rates of double and triple-layer coatings were 0.0030 mm/s, 0.0108 g/s, and −0.0030 mm/s, 0.0074 g/s, respectively. The enhanced ablative property was attributed to the positive role of the prepared ZrC-TaC middle layer, which not only relieves the CTE mismatch between the layers, but also stimulates the formation of continuous (Hf, Zr)O2 protective outer layer and reduction of surface temperature during ablation.

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