ISSN   1004-0595

CN  62-1224/O4

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王炳辉, 宋晨飞, 钱志源, 逄显娟, 宋鹏飞, 张s永振. 大气及真空环境下电流对柔性环滚动载流摩擦性能的影响[J]. 摩擦学学报(中英文), 2024, 44(5): 1−11. doi: 10.16078/j.tribology.2023140
引用本文: 王炳辉, 宋晨飞, 钱志源, 逄显娟, 宋鹏飞, 张s永振. 大气及真空环境下电流对柔性环滚动载流摩擦性能的影响[J]. 摩擦学学报(中英文), 2024, 44(5): 1−11. doi: 10.16078/j.tribology.2023140
WANG Binghui, SONG Chenfei, QIAN Zhiyuan, PANG Xianjuan, SONG Pengfei, ZHANG Yongzhen. Effect of Current on Friction Performance of Flexible Ring under Atmospheric and Vacuum Environments[J]. Tribology, 2024, 44(5): 1−11. doi: 10.16078/j.tribology.2023140
Citation: WANG Binghui, SONG Chenfei, QIAN Zhiyuan, PANG Xianjuan, SONG Pengfei, ZHANG Yongzhen. Effect of Current on Friction Performance of Flexible Ring under Atmospheric and Vacuum Environments[J]. Tribology, 2024, 44(5): 1−11. doi: 10.16078/j.tribology.2023140

大气及真空环境下电流对柔性环滚动载流摩擦性能的影响

Effect of Current on Friction Performance of Flexible Ring under Atmospheric and Vacuum Environments

  • 摘要: 使用外滚道、柔性环和内滚道构成滚动载流摩擦副,对比研究了大气及真空(10−3 Pa)环境下电流对柔性环滚动载流摩擦磨损性能的影响. 随着电流从0 A增至20 A,电致黏着导致摩擦力随电流增大而增大. 大气环境下氧化作用可促进摩擦表面材料剥落,导致磨痕宽度更大,进而导致大气摩擦力更高,表层塑性变形更严重. 真空环境下氧化磨损被抑制,接触表面材料剥落和塑性变形相对较轻. 电流从0 A增加至20 A,大气磨损面O与Cu原子比从0.379 7减少至0.144 3,真空磨损面O与Cu原子比从0.093 9减少至0.029 9. 硬度测试显示:在塑性硬化和电致软化共同影响下,摩擦表层硬度随电流的增大先增加后降低,硬度最高点对应的电流为5 A,真空下电致软化效果更明显.

     

    Abstract: The rolling current-carrying ring, as a key component for electrical connection between rotating parts, needs to face various complex working environments. In this article, the influence of current on the tribological behavior of flexible rings under both air and vacuum environments was studied. The friction pair used in the experiment consisted of an outer ring, a flexible ring, and an inner ring. The flexible ring was elastically clamped between the inner and outer rings by its own deformation. During the experiment, the inner cylinder drives at a speed of 600 r/min, and the total number of rotations for each test was 72 000 rotations. The vacuum degree was better than 10−3 Pa, and the preload force of the flexible ring was 20.4 N. The results showed that as the current increased from 0 A to 20 A, the wear amount and contact area of the wear zone increased under both atmospheric and vacuum environments. The widening of the wear mark was beneficial to reducing the contact resistance, but would cause an increase in friction. EDX testing showed that the atomic ratio of O:Cu on the worn surface decreased from 0.379 7 to 0.144 3 under atmospheric conditions, while it decreased from 0.093 9 to 0.029 9 under vacuum conditions. Due to the oxidation effect, material peeling could be promoted in the wear region, resulting in a larger wear mark width and higher friction coefficient, with more severe subsurface plastic deformation under atmospheric conditions. The peeling of oxide products under atmospheric conditions could reduce the oxidation degree of the wear surface. Under vacuum conditions, oxide wear was suppressed, and the degree of material peeling and plastic deformation were relatively lighter. Microhardness testing was carried out on the depth direction of the worn surface. At the same depth position, the hardness of different samples firstly increased and then decreased with the increase of current. When the current reached 5 A, the hardness of the friction surface was maximum. For the same sample, the position closest to the wear surface had the most significant plastic deformation, and its hardness gradually decreased with depth direction and tended to be similar to that of the matrix. When the current exceeded 5 A, the current density of a single contact point had exceeded 140 A/mm2, and high-density current could help reduce internal dislocation slip and annihilation in metal materials, reducing friction-hardening effect. Under vacuum conditions, the wear mark width of the flexible ring was relatively small, and current density was higher, resulting in stronger electrical softening effect. Therefore, surface hardness of wear zone under current-carrying conditions was a competitive result between friction-hardening and electrical-softening. In future work, we would investigate the tribological behavior of gold-plated flexible rings to eliminate oxidation effects. The research results in this article could provide references for the design of high-power rotating conductive joints under different environments.

     

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