• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (9): 63-70.doi: 10.3901/JME.2019.09.063

• 摩擦学 • 上一篇    下一篇

纯铜滚动载流摩擦副在不同载荷和电压作用下的失效研究

宋晨飞1,2, 孙毓明1, 张燕燕1, 孙逸翔1,3, 张永振1,3   

  1. 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 洛阳 471023;
    2. 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 兰州 730000;
    3. 机械科学研究总院武汉材料保护研究所 武汉 430030
  • 收稿日期:2018-05-12 修回日期:2018-12-24 出版日期:2019-05-05 发布日期:2019-05-05
  • 通讯作者: 张永振(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为苛刻工况下的干摩擦基础研究(高温、高速、复杂气氛、多物理耦合环境)。E-mail:yzzhang@haust.edu.cn
  • 作者简介:宋晨飞,男,1986年出生,博士,讲师,硕士研究生导师。主要研究方向为载流摩擦、微观摩擦。E-mail:cfsong@haust.edu.cn
  • 基金资助:
    国家自然科学基金(51775173,51405134)、中国博士后科学基金(2016M590676)和固体润滑国家重点实验室开放课题(LSL-1509)资助项目。

Failure of Cu Rolling Triboelectric Pairs under Various Load and Voltage

SONG Chenfei1,2, SUN Yuming1, ZHANG Yanyan1, SUN Yixiang1,3, ZHANG Yongzhen1,3   

  1. 1. National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023;
    2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000;
    3. Wuhan Research Institute of Materials Protection, China Academy of Machinery Science and Technology, Wuhan 430030
  • Received:2018-05-12 Revised:2018-12-24 Online:2019-05-05 Published:2019-05-05

摘要: 采用FTM-CF100载流摩擦试验机,以纯铜对滚配副为例研究了滚动载流摩擦副的失效行为和失效机制。随着测试时间的增加,摩擦因数首先保持平稳然后逐步上升,传导的电流在初期较快增加后保持稳定,在此过程中摩擦因数和电流的波动性增加。经过至少180 min运行后,保持电压不变时最终得到的摩擦因数和电流随载荷的增加而增加,且高载荷有利于获取较低的载流/摩擦波动性;保持载荷不变时高电压下摩擦因数更高而且波动性更大,均高于无电流情形。滚动载流摩擦副性能失效表现为摩擦因数的大幅上升以及电流波动性恶化,增加载荷和电压均加速失效过程。结合微观表征,推测在高压力和电阻热的作用下表面微凸峰易发生形变,造成载流摩擦表面粗糙度下降,因而真实接触面积增加从而电流上升;但此时铜材料易产生黏着,引起摩擦因数的升高;载流摩擦表面的局部氧化和氧化磨粒导致了载流/摩擦的波动性加剧。

关键词: 滚动, 失效, 载流摩擦

Abstract: Rolling electric contact is a novel style of conducting rotary joint, whose failure behavior and the involved mechanism under triboelectric conditions are studied by FTM-CF100 tribometer. It is found that the friction coefficient keeps stable firstly and then grows up as rolling continued, at the same time, the current rises rapidly at initial then level off. And the friction coefficient and current lose their stability during the rolling. After rolling for at least 180 minutes, the final friction coefficient and current increases with the increasing of contact load under a constant voltage. Load increasing can improve the stability of triboelectric contact. Moreover, the friction coefficient and its fluctuation increase with the growth of voltage, which is always higher than those during mechanical rolling. The performance failure could be summarized as significant rising of friction coefficient and deterioration of current stability. The growth of load and voltage will accelerate failure process. Based on micro characterization, it is speculated that asperities on triboelectric pairs should be flatten more easily due to the mechanical stress and joule heating, resulting in lower roughness and larger contact area, and consequently leading to the rising of current. The friction coefficient increases because of the adhesion between the asperities. The deterioration of triboelectric contact stability could be mainly attributed to the local oxidation and oxides debris.

Key words: failure, rolling, tribology with current

中图分类号: