紫杂铜的稀土除杂及微合金化热力学研究及实践
发布时间：2018-11-25 21:58
【摘要】：紫杂铜中多种微量杂质元素并存,其中的杂质元素会恶化铜材的加工性能和物理力学性能,进而缩短铜材的使用寿命。稀土元素在紫杂铜中可以起到除杂、微合金化、细化组织、改善力学性能和耐蚀性能等多种作用。分别从稀土元素镧、铈在铜中除杂的热力学原理、除杂顺序、稀土相的存在形式、微合金化机制、稀土诱导铜微观组织转变的判据及工业化应用等方面进行了研究和阐述。结果表明,稀土的净化作用、晶粒细化及第二相强化作用可以改善紫杂铜的力学性能和耐蚀性能,稀土Ce除杂的热力学顺序为:OSBiSnPbSiAlAgFe。稀土微合金化可以使铜的凝固组织发生柱状晶向等轴晶的转变(CET),稀土的净化效应和成分过冷共同作用导致了纯铜中CET的转变,建立了基于稀土含量为判据的CET预测模型,并确定了铜凝固组织发生CET转变的临界稀土La含量为0.14%。未来,紫杂铜的稀土除杂直接再利用技术有望得到实际工业应用。
[Abstract]:There are many trace impurity elements in purple miscellaneous copper, among which impurity elements will worsen the processing property and physical and mechanical properties of copper, and then shorten the service life of copper. Rare earth elements can be used for removing impurities, microalloying, refining microstructure, improving mechanical properties and corrosion resistance in purple miscellaneous copper. The thermodynamic principle of rare earth elements lanthanum and cerium in copper removal, the order of impurity removal, the existing form of rare earth phase, the mechanism of microalloying, the criterion of rare earth induced microstructure transformation of copper and the industrial application of rare earth elements were studied and expounded respectively. The results show that the purification, grain refinement and second phase strengthening of rare earth can improve the mechanical properties and corrosion resistance of purple miscellaneous copper. The thermodynamic order of rare earth Ce for removing impurities is as follows: OSBiSnPbSiAlAgFe. Rare earth microalloying can change the solidification structure of copper by columnar crystal to equiaxed crystal. The purification effect of (CET), rare earth and the supercooling of composition lead to the transformation of CET in pure copper. A prediction model of CET based on the criterion of rare earth content is established. The critical rare earth La content of CET transition in solidified structure of copper was determined to be 0.14%. In the future, the rare-earth direct reuse technology of purple copper is expected to be applied in industry.
【作者单位】： 中国科学院金属研究所;烟台大学环境与材料工程学院;沈阳理工大学材料科学与工程学院;
【基金】：中国科学院第二批支撑服务国家战略性新兴产业科技行动计划专项支持项目(2012102) 山东省高等学校科技计划项目(J15LA52) 烟台大学博士启动基金项目(HJ16B01)资助
【分类号】：TG146.11;TG292
本文编号：2357487
[Abstract]:There are many trace impurity elements in purple miscellaneous copper, among which impurity elements will worsen the processing property and physical and mechanical properties of copper, and then shorten the service life of copper. Rare earth elements can be used for removing impurities, microalloying, refining microstructure, improving mechanical properties and corrosion resistance in purple miscellaneous copper. The thermodynamic principle of rare earth elements lanthanum and cerium in copper removal, the order of impurity removal, the existing form of rare earth phase, the mechanism of microalloying, the criterion of rare earth induced microstructure transformation of copper and the industrial application of rare earth elements were studied and expounded respectively. The results show that the purification, grain refinement and second phase strengthening of rare earth can improve the mechanical properties and corrosion resistance of purple miscellaneous copper. The thermodynamic order of rare earth Ce for removing impurities is as follows: OSBiSnPbSiAlAgFe. Rare earth microalloying can change the solidification structure of copper by columnar crystal to equiaxed crystal. The purification effect of (CET), rare earth and the supercooling of composition lead to the transformation of CET in pure copper. A prediction model of CET based on the criterion of rare earth content is established. The critical rare earth La content of CET transition in solidified structure of copper was determined to be 0.14%. In the future, the rare-earth direct reuse technology of purple copper is expected to be applied in industry.
【作者单位】： 中国科学院金属研究所;烟台大学环境与材料工程学院;沈阳理工大学材料科学与工程学院;
【基金】：中国科学院第二批支撑服务国家战略性新兴产业科技行动计划专项支持项目(2012102) 山东省高等学校科技计划项目(J15LA52) 烟台大学博士启动基金项目(HJ16B01)资助
【分类号】：TG146.11;TG292
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