Ni-CrhBN自润滑复合材料的摩擦学性能研究-有色金属科学与工程.docVIP

Ni-Cr/hBN自润滑复合材料的摩擦学性能研究 王檬1，朱志云1，冯艳2，韦小凤2 (1. 江西理工大学，材料科学与工程学院，江西 赣州 341000) (2.中南大学 材料科学与工程学院，湖南 长沙 410083) 摘要：采用粉末冶金技术制备Ni-Cr/hBN自润滑复合材料，研究hBN含量及摩擦载荷对Ni-Cr/hBN复合材料的性能及摩擦磨损行为的影响。结果表明：随hBN含量增大，Ni-Cr/hBN复合材料的密度、抗弯强度和摩擦系数均逐渐减小。当载荷为20 N时，Ni-Cr/hBN复合材料的磨损速率随hBN含量的增大而减小；当载荷为60 N和100 N时，磨损速率随hBN含量增大呈先减小后增大的趋势。当hBN含量不变时，磨损速率随载荷增大而逐渐增大。通过探讨Ni-Cr/hBN自润滑复合材料的润滑与磨损机理可知，材料的摩擦系数取决于hBN的含量，而磨损速率与材料的力学性能有关。当hBN含量为9%(质量分数)，摩擦载荷为60 N时，Ni-Cr/hBN自润滑复合材料具有最佳的摩擦学综合性能。 关键词：Ni-Cr/hBN；自润滑复合材料；固体润滑剂；摩擦系数；磨损速率 中图法分类号：TG146.1 文献标志码：A 文章编号： Investigation on Tribological Properties of Ni-Cr/hBN Self-lubricating Composite WANG Meng1, ZHU Zhiyun1, FENG Yan2, WEI Xiaofeng2 (1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China) (School of Materials Science and Engineering, Central South University, Changsha 410083, China) Abstract: The Ni-Cr/hBN self-lubricating composites were prepared by the powder metallurgy technology. The influence of the hBN contents and working load on the properties and tribological performance of the Ni-Cr/hBN composite were investigated. The results show that, the density, bending strength and friction coefficient of the Ni-Cr/hBN composites decreased with the increasing of the hBN contents. Under the working load of 20 N, the wear rate of the Ni-Cr/hBN composite decreased with the increasing of hBN contents. However, under the loading of 60 and 100 N, the wear rate declined first, and then increased with hBN increasing. According to the lubrication and wear mechanism of the Ni-Cr/hBN self-lubricating composite, the friction coefficient was attributed to the hBN content, and the wear rate was related with the mechanical properties. The best tribological properties were obtained when the hBN content was 9% and working load was 60 N. Keywords: Ni-Cr/hBN; Self-lubricating composite; Solid lubricant; Friction coefficient; Wear rate 0 引言 随着工程技术的发展和进步金属基复合材料的要求越来越高，材料具有某些特殊性能的同时，具备良好的综合性能[1]。可