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研究了粉末冶金三元双相 Cu-44%Cr-12%Fe(质量分数)合金在 900℃不同氧分压下的氧化行为,用光学显微镜、XRD,SEM/EDX 观察和分析试样氧化膜的表面、截面形貌和组成。结果表明:合金中 44%的 Cr 含量在 0.1 MPa 纯氧中并不能使合金表面形成连续致密的 Cr2O3膜。合金的氧化速度随氧分压的降低而降低,原因是低氧分压有助于抑制合金中 Cr 的内氧化并形成连续致密的外 Cr2O3膜。最后讨论了氧化膜的形成机制。
The oxidation behavior of the powder metallurgy ternary dual-phase Cu-44% Cr-12% Fe (mass fraction) alloy at different oxygen partial pressure of 900 ℃ was investigated. The microstructure and mechanical properties of the samples were observed and analyzed by optical microscope, XRD and SEM / EDX The surface, cross-sectional morphology and composition. The results show that 44% Cr content in the alloy can not form continuous and compact Cr2O3 film on 0.1 MPa pure oxygen. The oxidation rate of the alloy decreases with the decrease of oxygen partial pressure because the partial pressure of low oxygen helps to suppress the internal oxidation of Cr in the alloy and form a continuous and dense outer Cr2O3 film. Finally, the formation mechanism of oxide film is discussed.