(1. 中国科学院金属腐蚀与防护研究所金属腐蚀与防护国家重点实验室，沈阳 110015；
2. 沈阳化工学院化工机械系，沈阳 110021)
摘 要: 研究了具有均匀两相组织的粉末冶金Cu-25Cr和Cu-50Cr合金在0.1MPa纯氧气中的氧化。与组织不均的铸态Cu-Cr合金相似，氧化后两种成分的粉末冶金Cu-Cr合金均形成了复杂的混合氧化膜，但未形成连续的Cr2O3层。而经机械合金化法获得的铬颗粒大小在1μm左右的 Cu-20Cr合金，氧化时则形成了连续的Cr2O3层。可见，在二元双相合金中，合金的氧化行为与合金的组织形态、大小和分布密切相关。
关键字: 粉末冶金；Cu-Cr合金；氧化
（1. State Key Laboratory for Corrosion and Protection, Institute of Corrosion and Protection of Metals,
The Chinese Academy of Sciences, Shenyang 110015, P.R.China;
2. Shenyang Institute of Chemical Technology, Shenyang 110021, P.R.China）
Abstract:The oxidation of Cu-Cr alloys having uniform two-phase microstructure and particle size of 30～40μm prepared by powder metallurgy was studied. Both PM Cu-25Cr and PM Cu-50Cr alloys formed complex mixing scales rather than continuously external chromium oxide scale as as-cast Cu-Cr alloy. But a continuous Cr2O3 scale formed on the Cu-20Cr alloy having uniform two-phase microstructure and average particle size of 1μm prepared by mechanical alloying. This indicated that the oxidation behavior in two-phase alloy can be deeply affected by the shape, size and spatial distribution of the two-phase particles.
Key words: powder metallurgy; Cu-Cr alloys; oxidation
