The effect of Lu₂O₃ on the oxidation behavior of SiC-ZrB₂ composite coating at 1500 ℃ in static air was investigated by oxidation test and first-principles simulations. The Lu₂O₃-SiC-ZrB₂ composite coating protected C/C composites from oxidation at 1500 ℃ for 836 h with a mass gain of only 0.62 mg/cm². The introduction of Lu₂O₃ was beneficial for improving the densification of Lu₂O₃-SiC-ZrB₂ composite coating. The experimental and first-principles simulations results suggest that Zr and Lu atoms tended to diffuse into the SiO₂ network, which further developed the stability of SiO₂ structure, thus leading to a good oxidation resistance of the Lu₂O₃-SiC-ZrB₂ composite coating.

通过氧化试验和第一性原理模拟研究了Lu ₂ O ₃对SiC-ZrB ₂复合涂层在1500 ℃静态空气中氧化行为的影响。Lu ₂ O ₃ -SiC-ZrB ₂复合涂层保护C/C复合材料在1500 ℃下氧化836 h，质量增加仅为0.62 mg/cm ²。Lu ₂ O ₃的引入有利于提高Lu ₂ O ₃ -SiC-ZrB ₂复合涂层的致密化。实验和第一性原理模拟结果表明 Zr 和 Lu 原子倾向于扩散到 SiO₂网络，进一步发展了SiO ₂结构的稳定性，从而导致Lu ₂ O ₃ -SiC-ZrB ₂复合涂层具有良好的抗氧化性。