四元三相Cu-20Ni-20Cr-5Co合金的高温氧化行为  

High cemperature oxidation behavior of quaternary three-phase Cu-20Ni-20Cr-5Co alloy

作　　者：曹中秋[1] 李凤春[1] 于龙[1] 

机构地区：[1]沈阳师范大学化学与生命科学学院,沈阳110034

出　　处：《中国有色金属学报》2011年第9期2190-2194,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50771068);辽宁省教育厅创新团队项目(2007T166)

摘　　要：研究四元三相Cu-20Ni-20Cr-5Co合金在700-900℃、0.1MPa纯氧气中的氧化行为以及添加第四组元Co对三元三相Cu-20Ni-20Cr合金氧化行为的影响。结果表明:合金为三相混合物,其氧化动力学曲线偏离抛物线规律,由几个线段组成,添加5%Co后合金的氧化速率明显降低。Cu-20Ni-20Cr-5Co合金表面形成的氧化膜外层主要是由CuO组成,内层是合金与氧化物组成的混合内氧化区,最终合金内层表面形成一连续的Cr2O3层,阻止合金的进一步氧化。The oxidation of a quaternary three-phase Cu-20Ni-20Cr-5Co alloy formed by adding 5% Co（mole fraction） to Cu-20Ni-20Cr alloy was studied at 700-900 ℃ in 0.1 MPa pure oxygen.The results show that the alloy contains a mixture of three phases,and its kinetic curves deviate considerably from the parabolic rate law and are composed of a few of stages.The oxidation rates become lower evidently after 5% Co is added to Cu-20Ni-20Cr alloy.The Cu-20Ni-20Cr-5Co alloy forms the external scales containing CuO and an inner oxidation region containing a mixture of alloy and oxides.At last,this alloy is able to form a continuous layer of Cr2O3 at the top of the mixed inner region.It prevents this alloy from being oxidized further.

关 键 词：Cu-20Ni-20Cr-5Co合金 三相组织 添加组元 高温氧化 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG172.82[金属学及工艺—金属材料]