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银基复合材料电刷的摩擦磨损特性
白云路,张强
北京控制工程研究所,北京 100190
摘要:
基于Archard模型建立了电刷与导电环之间摩擦过程的磨损模型。搭建了导电环摩擦磨损试验台,对银基复合材料电刷的电接触摩擦磨损性能进行了实验验证。结果表明,大的接触压力会使表面微凸体更容易发生塑性变形而形成磨屑;载流会在电刷材料表面形成波纹状磨痕并产生粉末状的磨屑;磨损率在磨损初期会由于接触面积较小和表面加工硬化的作用出现先升后降的变化规律;对磨损率模型进行修正,使该磨损率模型对银基复合材料电刷磨损率的预测较为准确,为进一步研发银基复合材料电刷提供了理论指导和实验依据。
关键词:  银基复合材料  电刷  摩擦磨损  Archard模型  空间技术
DOI:10.12044/j.issn.1007-2330.2019.02.012
分类号:TH117.1
基金项目:装备预先研究项目 30504040308 装备预先研究项目(30504040308)
Friction and Wear Properties of Silver-Based Composite Electrical Brush
BAI Yunlu,ZHANG Qiang
Beijing Institute of Control Engineering, Beijing 100190
Abstract:
Based on the Archard wear model, a mathematical wear rate model in the course of friction between brush and conducting ring was set up. A friction and wear test bench for conducting ring was built, the friction and wear performance of electro-contact of silver - based composite brush is verified experimentally. We can conclude that a large contact pressure makes micro-convexs on the surface to the state of plastic deformation and forming abrasive particles more easily.The carrying current forms corrugated abrasion marks on the surface of the brush material and produces powder abrasive particles.The wear rate increases first and then decreases at the beginning of wear due to the small contact area and the hardening effect of surface processing.The wear rate model is modified so that it is more accurate to predict the wear rate of silver base composite brush.This study provides theoretical guidance and experimental basis for further research and development of silver-based composite brush.
Key words:  Silver-based composite  Electrical brush  Friction and wear  Archard’s model, Space technology