(1. 中國科學(xué)院金屬腐蝕與防護研究所金屬腐蝕與防護國家重點實驗室，沈陽 110015；
2. 沈陽化工學(xué)院化工機械系，沈陽 110021)
摘 要: 研究了具有均勻兩相組織的粉末冶金Cu-25Cr和Cu-50Cr合金在0.1MPa純氧氣中的氧化。與組織不均的鑄態(tài)Cu-Cr合金相似，氧化后兩種成分的粉末冶金Cu-Cr合金均形成了復(fù)雜的混合氧化膜，但未形成連續(xù)的Cr2O3層。而經(jīng)機械合金化法獲得的鉻顆粒大小在1μm左右的 Cu-20Cr合金，氧化時則形成了連續(xù)的Cr2O3層。可見，在二元雙相合金中，合金的氧化行為與合金的組織形態(tài)、大小和分布密切相關(guān)。
關(guān)鍵字: 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
