化学学报 ›› 2003, Vol. 61 ›› Issue (2): 166-170. 上一篇    下一篇

研究论文

显微组织对Cu—40Ni-20Cr合金氧化行为的影响

曹中秋;牛焱   

  1. 沈阳师范大学化学系;中国科学院金属研究所
  • 发布日期:2003-02-15

Effect of Microstructure on the Oxidation Behavior of Cu-40Ni-20Cr Alloy

Cao Zhongqiu;Niu Yan;Wu Weitao   

  1. Department of Chemistry,Shenyang Normal University
  • Published:2003-02-15

为探讨显微组织变化对三元复相合金氧化行为的影响,采用机械合金化制备了 纳米品三元Cu—40Ni-20Cr合金,并对比研究了该合金与同成分铸态合金在700— 800℃,0.1MPa纯氧气中的氧化行为。结果表明,铸态合金表面没有形成连续的 Cr2O3外氧化膜,但在混合内氧化区则形成了一薄连续网状的Cr2O3层。而纳米晶 Cu—40Ni-20Cr合金表面形成了连续的Cr2O3外氧化膜,品粒细化降低了合金表面形 成Cr2O3膜所需活泼组元Cr的临界浓度。

关键词: 铜合金, 镍合金, 铬合金, 显微组织, 合金化

The thermogravimetric analysis of ternary Cu-40Ni-20Cr alloys with different microstructures was performed in order to study the effect of microstructure change on oxidation behavior of ternary multi-phase alloys. The results show that the casting Cu-40Ni-20Cr alloy is unable to form protective external scale of chromia, but a very irregular and thin continuous layer of chromia formed at the base of the mixed internal region, while mechanical alloying Cu-4QNi-20Cr alloy is able to form an external C-2O-3 layer associated with a wide light zone depleted of chromium. The reduction in the alloy grain size obviously favors the formation of &203 layer on the ternary multi-phase alloy surface

Key words: COPPER ALLOYS, NICKEL ALLOYS, CHROMIUM ALLOYS, MICRO-STRUCTURE, ALLOYING

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