中文摘要：

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。

英文摘要：

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.