Microstructure and Properties of Vacuum Hot-press Sintered W/Cu-Al2O3 Composite

摘要：

W-Cu alloys have broadly applied as contact materials in high voltage load switches. In this work, the tungsten (W) particulate reinforced Al2O3 dispersion strengthened copper base composites were successfully fabricated by using a vacuum hot-press sintering furnace. The microstructures of the W /Cu-Al2O3 composite were analyzed with a scanning electron microscope and transmission electron microscope respectively. The bending strength, electric conductivity and micro hardness of the composites were determined with a universal material tester, a vortex conductivity tester and a digital micro hardness indenter respectively. The density of the composites was measured with the Archimedes Method. The plastic deformation behavior of the composites at elevated temperature was investigated by using a physical simulator of thermo-mechanical processes of the model 1500D Gleeble system. The results show that the microstructure of the W/Cu-Al2O3 composites is consisted of the matrix of the Al2O3 dispersion strengthened copper base and the reinforced phase of homogeneous distributed W particles. The composite is very dense with the relative theoretical density of 99.8%. The composites show excellent comprehensive properties of micro hardness of 135 HV, electrical conductivity of 46% IACS and bending strength of 291 MPa. The bending-fracture surface observation shows that the brittle fracture mechanism is due to the copper base binder fracture followed by tungsten-copper interface separation and tungsten particle cleavage. The thermo-mechanical processes simulating results show that with increasing the deformation, the density of the W /Cu-Al2O3 composite further increases.

作者: Tian Bao-hong Zhang Xiao-wei Zhang Rui-long Liu Yong Jia Shu-guo Ren Fengzhang

作者单位: School of Materials Science and Engineering, Henan University of Science and Technology,Luoyang 4710 Henan Key Laboratory of Advanced Non-ferrous Metals, Luoyang 471003, China School of Materials Science and Engineering, Henan University of Science and Technology,Luoyang 4710 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471

会议类型: 国际会议

会议名称: The 6th International Conference on Physical and Numerical Simulation of Materials Processing(第六届材料与热加工物理模拟及数值模拟国际学术会议 ICPNS 2010)

会议地点: 桂林

会议语种:英文

页码: 1-5

在线出版日期: 2010-11-16（万方平台首次上网日期，不代表论文的发表时间）