Abstract Si3N4, (ZrO2+B4C + Si) and (ZrB2+SiC + B4C + Y2O3+Al2O3) were used as precursors for in-situ formation of SiC, ZrB2-SiC and ZrB2-SiC-B4C-YAG coatings respectively. The oxidation behavior of coated C/C composites was studied by cyclic oxidation in air at temperatures between 1500 °C and 1700 °C. The SiC coating exhibited the lowest weight loss at 1500 °C and 1600 °C. After initial mass loss for two cycles of oxidation at 1500 °C, the ZrB2-SiC coating was found to provide the best protection by the precipitated ZrO2 in SiO2 glass at 1700 °C. The ZrB2-SiC-B4C-YAG coating performed well at 1700 °C with the formation of a complex YAG glass containing ZrB2/ZrO2.

中文翻译：

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用于C/C复合材料高温氧化保护的SiC、ZrB 2 -SiC和ZrB 2 -SiC-B 4 C-YAG涂层的原位形成

摘要 Si3N4、(ZrO2+B4C+Si)和(ZrB2+SiC+B4C+Y2O3+Al2O3)分别用作原位形成SiC、ZrB2-SiC和ZrB2-SiC-B4C-YAG涂层的前驱体。通过在空气中在 1500°C 和 1700°C 之间的温度下循环氧化来研究涂层 C/C 复合材料的氧化行为。碳化硅涂层在 1500 °C 和 1600 °C 时表现出最低的重量损失。在 1500 °C 下进行两次氧化循环的初始质量损失后，发现 ZrB2-SiC 涂层通过在 1700 °C 下在 SiO2 玻璃中沉淀的 ZrO2 提供最佳保护。ZrB2-SiC-B4C-YAG 涂层在 1700 °C 下表现良好，形成了含有 ZrB2/ZrO2 的复合 YAG 玻璃。