(沈阳师范大学 化学与生命科学学院，沈阳 110034)
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。
关键字: Cu-20Ni-20Cr-5Co合金；三相组织；添加组元； 高温氧化
quaternary three-phase Cu-20Ni-20Cr-5Co alloy
（College of Chemistry and Lift Science, Shenyang Normal University, Shenyang 110034, China）
Abstract: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.
Key words: Cu-Ni-Cr-Co alloy; three-phase morphology; adding component; high temperature oxidation
