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研究了Cu-19Ni-17Fe-19Cr合金在800,850,900℃下纯氧环境中的高温氧化行为。利用增重法拟合合金在不同温度下的氧化动力学曲线,通过XRD,SEM及EDS对氧化膜成分及形貌进行分析,探讨了合金的氧化机制。结果表明:合金的氧化动力学曲线在800℃时遵循抛物线规律,850,900℃时符合立方抛物线规律,氧化过程中合金表面生成复合氧化膜,氧化膜由各组元的混合氧化物组成,最外层为CuO,次外层以Cr2O3为主,随着氧化温度的升高,CuO膜层会横向生长覆盖Cr2O3膜层,综合分析表明合金在850℃下具有良好的高温抗氧化性。
The oxidation behavior of Cu-19Ni-17Fe-19Cr alloy at 800, 850 and 900 ℃ in pure oxygen environment was studied. The oxidation kinetics curves of the alloy at different temperatures were fitted by the weight gain method. The composition and morphology of the oxide film were analyzed by XRD, SEM and EDS, and the oxidation mechanism of the alloy was discussed. The results show that the oxidation kinetics of the alloy follow the parabolic law at 800 ℃ and the cubic parabolic law at 850 and 900 ℃. The composite oxide film is formed on the surface of the alloy during the oxidation process. The oxide film consists of the mixed oxide of the components. The outermost layer Is CuO, and the outer layer is mainly Cr2O3. With the increase of oxidation temperature, the CuO layer grows laterally and covers the Cr2O3 layer. Comprehensive analysis shows that the alloy has good high temperature oxidation resistance at 850 ° C.