铜业工程Issue(3)：33-43,11.DOI:10.3969/j.issn.1009-3842.2025.03.005
微量碱土金属Sr对纯铜导电率和热稳定性的影响
Effect of Trace Sr Element on Conductivity and Thermal Stability of Pure Copper
摘要
Abstract
Pure copper,as a conductor material for high-power electronic devices,is required to have both excellent electrical conduc-tivity and thermal stability.This paper investigates the influence of trace alkaline earth metal Sr on electrical conductivity and thermal stability of pure copper(99.99%),and analyzes the microstructural changes using optical microscopy(OM)and electron backscatter diffraction(EBSD).The results indicate that trace Sr elements play a role in purifying the copper matrix,which can reduce the softening temperature of pure copper,increase electrical conductivity,and enhance the thermal stability of grain size at high temperatures.The softening temperatures of 4N Cu,Cu-54Sr and Cu-170Sr samples are 218,160 and 138℃,respectively;the electrical conductivities of 4N Cu,Cu-54Sr and Cu-170Sr samples in the cold-rolled state are 100.9,101.1 and 101.2%IACS,respectively;after high-temperature heat treatment at 850℃for 30 min,the average grain sizes are 186.5,61.9 and 29.2 µm,respectively.The reasons for this are as follows:trace Sr can react with impurities to purify copper matrix,thereby improving the electrical conductivity and lowering recrystalli-zation temperature.The improvement of thermal stability of grain size at high temperatures is,on the one hand,related to the compounds formed by Sr and impurities that can impede grain boundary migration;on the other hand,the trace Sr element leads to a change in the stacking fault energy of pure copper,which alters grain boundary migration rate and growth mode at high temperatures and inhibits the transformation of Cube texture at high temperatures.关键词
纯铜/Sr元素/Cube织构/晶界迁移/层错能Key words
pure copper/Sr element/Cube texture/grain boundary migration/stacking fault energy分类
金属材料引用本文复制引用
李伟强,刘海涛,王梦娜,郭慧稳,周延军,朱治愿,岳鹏飞,张国赏,宋克兴..微量碱土金属Sr对纯铜导电率和热稳定性的影响[J].铜业工程,2025,(3):33-43,11.基金项目
国家自然科学基金项目(52071133) （52071133）
河南省科技开发联合基金重大专项(235200810004) （235200810004）
洛阳市重大科技创新专项(2201017A) （2201017A）
河南省科学院高层次人才科研启动项目(242017002) （242017002）
河南省顶尖人才培养计划项目(244500510020) （244500510020）
中国工程科技发展战略河南研究院战略咨询研究项目(2024-HENZDB-02)资助 （2024-HENZDB-02）
