添加Ni对Cu-25Co合金在600,700℃纯氧气中氧化行为的影响(英文)  

Effect of Ni Addition on the Oxidation Behavior of Cu-25Co Alloy at 600,700℃ in 0.1 MPa Pure O_2

作　　者：曹中秋[1] 李凤春[1] 沈莹[1] 邓继东[1] 

机构地区：[1]沈阳师范大学,辽宁沈阳110034

出　　处：《稀有金属材料与工程》2009年第A01期393-397,共5页Rare Metal Materials and Engineering

基　　金：Project supported by the National Natural Science Foundation of China(50771068);Project supported by Liaoning Province Education Committee of China(2007T166)

摘　　要：研究了三元双相Cu-20Ni-25Co合金在600,700℃、0.1MPa纯氧气中的氧化行为。结果表明:合金的氧化动力学不规则且偏离抛物线规律,氧化动力学曲线由3段抛物线段组成。前期研究的二元双相Cu-25Co合金经过了较长时间的氧化后合金表面未能形成活泼组元Co的选择性外氧化,而本研究的Cu-20Ni-25Co合金表面氧化膜外层主要是由CuO组成,紧接着是Co的氧化物层。可见,向Cu-25Co合金中加入Ni后,降低了合金表面形成活泼组元Co外氧化膜所需的临界浓度,促使合金表面在较低Co含量下能形成活泼组元Co的外氧化膜。The oxidation of a ternary double-phase Cu-Ni-Co alloy containing approximately 20 wt% Ni and 25wt% Co, balance Cu （Cu-20Ni-25Co）, was studied at 600, 700 ℃ in 0.1 MPa pure O2. The results show that the oxidation kinetic curves for the present alloy are irregular and deviate from the parabolic rate law which are composed of three quasi-parabolic stages. The previously examined binary double-phase Cu-25Co alloy was unable to form the exclusive external scales of reactive element Co oxides over the alloy surface even after an extended period of oxidation; however, the present alloy formed the light external scales composed of CuO matrix followed by a layer of Co oxides with some pores. It is obvious that adding 20 wt% Ni to Cu-25Co alloy is able to decrease the critical Co content required to form the most stable oxide and complete transformation from a mixed oxides composed of the Cu-rich metal phase with Co oxides to the exclusive external scales of Co oxides under a lower Co content.

关 键 词：Cu-Ni—Co合金 添加Ni 高温氧化 

分 类 号：TG171[金属学及工艺—金属表面处理]