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个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职：材料科学与工程学院院长、党委副书记
其他任职：辽宁省高熵合金材料工程研究中心常务副主任、大连理工大学滇西产业发展研究院先进材料制备及装备技术工程研究中心主任
性别：男
毕业院校：西北工业大学
学位：博士
所在单位：材料科学与工程学院
学科：材料加工工程. 材料学. 材料物理与化学
办公地点：辽宁省凝固控制与数字化制备技术重点实验室315室
联系方式：0411-84709400
电子邮箱：luyiping@dlut.edu.cn
Study of ultrahigh-purity copper billets refined by vacuum melting and directional solidification
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论文类型：期刊论文
发表时间：2011-06-01
发表刊物：RARE METALS
收录刊物：Scopus、SCIE、EI、CSCD
卷号：30
期号：3
页面范围：304-309
ISSN号：1001-0521
关键字：copper; refining; vacuum melting; directional solidification; electrical conductivity
摘要：The purpose of this paper is to study large-sized copper billets refined with 5N ultrahigh purity after vacuum melting and directional solidification (VMDS). The precise impurity analysis of copper billets was carried out with a glow discharge mass spectrometer (GDMS). The results demonstrate that the total concentration of twenty-two impurities is decreased by 63.1wt.%-66.5 wt.%. Ag, P, S, Na, Mg, Se, Zn, In and Bi are easy to be removed due to lgP (imp) - lgP (Cu) > 1.5, and they can be removed effectively under the vacuum condition of 1650-1700 K for 30 min. The electrical conductivity of 5N copper is higher than that of the raw material as the impurity concentrations decrease. The segregation effect in directional solidification can be remarkable when the equilibrium distribution coefficient (k (0)) value is less than 0.65 due to the strong affinity of Cu for some metallic and non-metallic impurities.