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研究了Hf和Y对Ni3Al-7.8Cr-4Mo-0.05B合金氧化性能的影响,测定了合金在1000和1100℃的恒温氧化动力学曲线,并通过XRD分析表面氧化膜结构,通过扫描电镜和能谱分析研究了氧化产物的微观组织与成分。结果表明:Hf和Y的加入大大提高合金的抗氧化性能,主要影响在于形成稳定性更好的HfO2,提高氧化膜与基体的粘结力,抑制了硫在氧化皮/基体界面的偏聚、改变氧化膜的形貌与组成、内氧化程度、扩散层深度等。
The effects of Hf and Y on the oxidation performance of Ni3Al-7.8Cr-4Mo-0.05B alloy were investigated. The kinetic curves of the oxidation at constant temperature between 1000 and 1100 ℃ were investigated. The structure of the surface oxide film was analyzed by XRD. Spectral analysis of the oxidation of the microstructure and composition. The results show that the addition of Hf and Y greatly enhances the oxidation resistance of the alloy. The main effect is to form HfO2 with better stability, to increase the adhesion of the oxide film to the matrix, to suppress the segregation of sulfur at the oxide / matrix interface, Change oxide film morphology and composition, the degree of internal oxidation, diffusion layer depth and so on.