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)O protective outer layer and reduction of surface temperature during ablation.

中文翻译：

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2700℃下ZrC-TaC中间层对(Zr,Hf)C固溶涂层耐烧蚀性能的影响及机理

(Hf, Zr)C/SiC 涂层中加入中间 ZrC-TaC 层，以增强其高温下的抗烧蚀性能。在2700℃的温度下分析了该中间层对(Zr,Hf)C固溶体涂层的耐烧蚀性能和机理的影响。由于(Hf,Zr)C/ZrC-TaC/SiC涂层形成梯度多层结构，(Hf,Zr)C/ZrC-TaC/SiC三层涂层表现出比(Hf,Zr)C/ZrC-TaC/SiC涂层更优异的烧蚀性能。 Zr)C/SiC双层涂层。在约2700℃下烧蚀20秒后，双层和三层涂层的线性和质量烧蚀速率分别为0.0030mm/s、0.0108g/s和-0.0030mm/s、0.0074g/s。烧蚀性能的增强归因于制备的ZrC-TaC中间层的积极作用，它不仅缓解了层间的CTE不匹配，而且刺激了连续(Hf, Zr)O保护外层的形成并减少了表面消融期间的温度。