摘要
采用粉末冶金工艺分别制备了单一粒径TiB2颗粒和多粒径TiB2颗粒增强铜基复合材料,对比研究了非载流和载流条件下多粒径(2μm+50μm)TiB2/Cu复合材料的摩擦磨损行为。微观组织观察表明:不同粒径的TiB2颗粒在Cu基体中分布均匀。与单一粒径TiB2/Cu复合材料相比,多粒径TiB2/Cu复合材料具有更高的相对密度、硬度和导电率。摩擦磨损实验结果表明:多粒径TiB2/Cu复合材料抗摩擦磨损性能明显高于单一粒径TiB2/Cu复合材料,当2μm与50μmTiB2颗粒配比为1∶2时,多粒径TiB2/Cu复合材料的抗摩擦磨损性能最佳。相对于2μm单一粒径TiB2/Cu复合材料,电流为0A时,(2μm+50μm)TiB2/Cu复合材料的摩擦系数和磨损率分别降低了17.3%和62.5%;电流为25A时,(2μm+50μm)TiB2/Cu复合材料的摩擦系数和磨损率分别降低了6%和45.8%,同时载流效率和载流稳定性得到明显提高,磨损表面更加平整。磨损机制分析表明:多粒径TiB2颗粒合理配比有利于提高复合材料载流质量,同时摩擦过程中大粒径的TiB2颗粒起到支撑作用,小粒径的TiB2颗粒弥散强化Cu基体,二者的协同作用使TiB2/Cu复合材料具有更好的抗载流摩擦磨损性能。
Copper matrix composites reinforced with single sized TiB2particles and mixing sized TiB2particles were prepared by powder metallurgy,respectively.Effects of mixing sized TiB2particles(2μm+50μm)on the friction behavior under non-current and current of the TiB2/Cu composites were studied.Microstructure observation shows that the different TiB2particles are evenly distributed in the copper matrix.The higher relative density,the hardness and electrical conductivity of mixing sized TiB2/Cu composite are obviously better than those of TiB2/Cu composites reinforced with single sized TiB2particles.The results of friction and wear tests show that:The friction and wear properties of mixing sized TiB2/Cu composites are significantly higher than those of single sized TiB2/Cu composites.When the mixed ratio of 2μm and 50μm TiB2particles is 1∶2,the TiB2/Cu composite has the best wear resistance,when the current is 0A,compared to the composites with 2μm single sized,its friction coefficient and wear rate decrease by 17.3%and 62.5%,respectively,when the current is 25A,compared to TiB2/Cu composites with 2μm single sized,its friction coefficient and wear rate decrease by 6%and 45.8%,respectively.Meanwhile,its wear surface is more flat and the stability of the current carrying and efficiency of the current carrying capacity are obviously improved.The analysis of wear mechanism shows that:The mixed TiB2particles are favorable for improving the current carrying quality of TiB2/Cu composites.The mixed TiB2particles play a supporting role in the friction process,and the small TiB2particles disperse and strengthen the Cu matrix.The synergistic effect of that makes the TiB2/Cu composites have better current-carrying friction and wear resistance.
作者
张胜利
国秀花
宋克兴
梁淑华
周延军
ZHANG Shengli;GUO Xiuhua;SONG Kexing;LIANG Shuhua;ZHOU Yanjun(School of Materials Science and Engineering,He’nan University of Science and Technology,Luoyang 471023,China;Key Laboratory of Materials Science&Processing Technology for Non-ferrous Metals of He’nan,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Metals,Luoyang 471023,China;School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2019年第10期2348-2356,共9页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(U1502274
51605146)
河南省高校青年骨干教师计划项目(2018GGJS045)
河南省创新科技团队(C20150014)
中国博士后科学基金(2018M632769)
关键词
TiB2/Cu复合材料
多粒径颗粒
协同作用
载流摩擦
磨损率
TiB2/Cu composites
mixing sized particles
synergistic effect
wear with electric current
friction coefficient
