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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
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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.
机构地区 沈阳师范大学
出处 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 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)
关键词 Cu-Ni—Co合金 添加Ni 高温氧化 Cu-Ni-Co alloy adding Ni high-temperature oxidation
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参考文献1

  • 1F. Gesmundo,Y Niu,F. Vianiand D.L. Douglass(Universita di Genova, Fiera del Mare, Pad. D,16129 Genova, Italy)(State Key Lab. for Corrosion and Protection, Institute of Corrosion and Protection of Metals, theChinese Academy of Sciences, Shenyang 110015, Ch.OXIDATION OF A TWO-PHASE Cu-75Cr ALLOY IN AIRAT 700-900℃[J].Acta Metallurgica Sinica(English Letters),1997,10(4):333-341. 被引量:21

二级参考文献9

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