挤压致密超细WC/纳米Al2O3弥散强化铜基复合材料的组织性能研究  

Study on the microstructure and properties of dispersion-reinforced Cu-based composites by ultrafine WC and nano-sized Al2O3 particles via extrusion densification

作　　者：张小红[1] 申景园 孙宇[2] 胡连喜[2] ZHANG Xiao-hong;SHEN Jing-yuan;SUN Yu;HU Lian-xi(Wuxi Institute of Technology,Wuxi 214121,China;School of Materials Science and Engineering,HarbinInstitute of Technology,Harbin 150001,Chain)

机构地区：[1]无锡职业技术学院,无锡214121 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《粉末冶金技术》2019年第6期422-427,共6页Powder Metallurgy Technology

摘　　要：以纳米Al2O3颗粒、超细WC粉末、工业纯Cu粉末为原料,通过热挤压致密获得了超细WC/纳米Al2O3弥散强化铜基(WC-Al2O3/Cu)复合材料,研究了挤压态WC-Al2O3/Cu复合材料的微观组织及力学性能。结果表明:成分为5%WC-2%Al2O3/Cu和10%WC-2%Al2O3/Cu(质量分数)的两种原料粉末,经机械球磨、冷压、真空烧结和热挤压后,其相对密度均达到了99%以上,超细WC和纳米Al2O3强化相颗粒呈均匀弥散分布,具有很好的导电性及力学性能;其中,5%WC-2%Al2O3/Cu复合材料的综合性能更佳,其抗拉强度达到235.06 MPa,延伸率为15.47%,导电率可达85.28%IACS,软化温度不低于900℃。The dispersion-reinforced Cu-based composites by ultrafine WC and nano-sized Al2O3 particles(WC-Al2O3/Cu)were obtained by hot extrusion densification using the nano-sized Al2O3 particles,ultrafine WC powders,and industrial pure copper powders as raw materials.The microstructures and performances of the extruded WC-Al2O3/Cu composites were investigated.In the results,the relative density of the 5%WC-2%Al2O3/Cu and 10%WC-2%Al2O3/Cu composites by mass is over 99%after mechanical milling,cold pressing,vacuum sintering,and hot extrusion.At this meantime,the ultrafine WC and nano-sized Al2O3 particles distribute homogenously in the Cu matrix,resulting in high mechanical strength and excellent electrical conductivity.The tensile strength,elongation,and electrical conductivity of 5%WC-2%Al2O3/Cu composites are 235.06 MPa,15.47%,and 85.28%IACS,respectively,and the softening temperature is above 900℃,showing a better comprehensive performances.

关 键 词：铜基复合材料 弥散强化 挤压致密 显微组织 力学性能 

分 类 号：TB33[一般工业技术—材料科学与工程]