原位生成MoB增强Cu-Sn-Al合金复合材料的摩擦学性能研究  

Tribological Properties of In-Situ MoB Reinforced Cu-Sn-Al Composites

作　　者：常宝林 于增光 王睿杰 王帅[1,3] 程楚[2] 孙乐民 杨军[3] 张永振[1] CHANG Baolin;YU Zengguang;WANG Ruijie;WANG Shuai;CHENG Chu;SUN Lemin;YANG Jun;ZHANG Yongzhen(National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology,Henan Luoyang 471023,China;School of Materials Science and Engineering,Henan University of Science and Technology,Henan Luoyang 471023,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China)

机构地区：[1]河南科技大学高端轴承摩擦学技术与应用国家地方联合工程实验室,河南洛阳471023 [2]河南科技大学材料科学与工程学院,河南洛阳471023 [3]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《摩擦学学报》2022年第6期1116-1126,共11页Tribology

基　　金：国家自然科学基金项目(U18042525,51805513);河南省高等学校重点科研项目计划(20A430009);固体润滑国家重点实验室开放课题(LSL-2014)资助。

摘　　要：采用快速热压烧结方法成功制备了原位生成MoB增强的Cu-Sn-Al合金复合材料,研究了增强体添加含量对复合材料体系摩擦学性能的影响,并对其摩擦磨损机制进行了分析.研究表明:在Cu-5Sn合金基体中添加MoAlB陶瓷颗粒后,烧结过程中,层状结构MoAlB陶瓷中的Al元素能够扩散到基体中,生成原位MoB增强Cu-Sn-Al合金复合材料.此外,复合材料体系的硬度随着MoAlB添加量的增加逐渐提高,与Cu-5Sn合金相比,当添加MoAlB质量分数为30%时,复合材料硬度值提高了约5倍.同时,随着添加MoAlB陶瓷颗粒含量的增加,复合材料体系摩擦系数和磨损率逐渐降低,当添加的MoAlB陶瓷颗粒质量分数为30%时,复合材料摩擦系数和磨损率分别低至0.33和5.4×10^(-5)mm^(3)/(N·m).由于原位生成MoB颗粒的钉扎效应,在摩擦过程中能够抑制基体材料的塑性变形,使得材料体系的硬度显著提高,磨损率明显降低,摩擦过程中表面生成的摩擦氧化物,能够降低材料体系的黏着磨损和二体磨粒磨损,可以起到优异的抗磨减摩效应.In this study,in-situ generating MoB ceramic reinforced Cu-Sn-Al alloy composites were successfully prepared by sintering the raw materials of Cu,Sn and MoAlB powders via fast hot-press sintering route.The influence of the content of MoAlB ceramic reinforcement on the microstructure and tribological properties of the as-prepared composites were studied,and the friction and wear mechanisms of the composites were discussed as well.It was established that when the MoAlB ceramic particles were doped in the Cu-5Sn alloy matrix,Al element in the layered MoAlB ceramic could be diffused out of MoAlB matrix and diffused into the Cu-5Sn alloy matrix during the sintering process,resulting in the formation of in-situ MoB ceramic particles reinforced Cu-Sn-Al alloy matrix composites.Because of the dispersion strengthening effect of in-situ forming MoB particles,the as-prepared Cu matrix composites could exhibit enhanced mechanical properties.It was confirmed that the Vickers hardness,compressive strength and flexural strength of as-prepared composites were greatly improved in comparison with as-prepared Cu-5Sn alloy.When the mass fraction of MoAlB was as high as 30%,the hardness value of the composite was about 321.2 HV0.1,which was approximately five times higher than that of as-prepared Cu-5Sn alloy.As the mass fraction of MoAlB was as high as 10%,the as-prepared Cu matrix composite had the highest compressive strength and flexural strength,where the compressive strength and flexural strength were 1156.5 MPa and 822 MPa,respectively.When the mass fraction of MoAlB further increased,the compressive strength and flexural strength of as-prepared gradually decreased.Furthermore,the friction coefficient and wear rate of as prepared composites gradually came down with the mass fraction of MoAlB increasing up to 30%.For as-prepared Cu-5Sn alloy,the friction coefficient and wear rate were 0.67and 3.60×10^(-4) mm^(3)/(N·m),respectively.The main wear mechanisms were two-body abrasive and adhesive wear.When the mass fraction of MoAl

关 键 词：铜基复合材料 MoAlB 原位生成 摩擦学行为 磨损机制 

分 类 号：TH117.1[机械工程—机械设计及理论] TH142.2[一般工业技术—材料科学与工程]