ISSN   1004-0595

CN  62-1095/O4

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孙洋, 李文生, 胡伟, 杨军, 朱圣宇, 范祥娟. 镍基自润滑涂层的摩擦学性能[J]. 摩擦学学报, 2018, 38(5): 562-569. DOI: 10.16078/j.tribology.2018.05.009
引用本文: 孙洋, 李文生, 胡伟, 杨军, 朱圣宇, 范祥娟. 镍基自润滑涂层的摩擦学性能[J]. 摩擦学学报, 2018, 38(5): 562-569. DOI: 10.16078/j.tribology.2018.05.009
SUN Yang, LI Wensheng, HU Wei, YANG Jun, ZHU Shengyu, FAN Xiangjuan. Tribological Performance of Nickel-Alloy Matrix Self-Lubricating Coatings[J]. TRIBOLOGY, 2018, 38(5): 562-569. DOI: 10.16078/j.tribology.2018.05.009
Citation: SUN Yang, LI Wensheng, HU Wei, YANG Jun, ZHU Shengyu, FAN Xiangjuan. Tribological Performance of Nickel-Alloy Matrix Self-Lubricating Coatings[J]. TRIBOLOGY, 2018, 38(5): 562-569. DOI: 10.16078/j.tribology.2018.05.009

镍基自润滑涂层的摩擦学性能

Tribological Performance of Nickel-Alloy Matrix Self-Lubricating Coatings

  • 摘要: 镍基自润滑复合粉末(NiCrMoAl-Ag-BaF2/CaF2)采用高能球磨结合喷雾造粒法制备,镍基自润滑涂层利用等离子喷涂技术制备. 涂层摩擦磨损性能利用HT-1000型销-盘摩擦试验机在不同摩擦速度(0.2~1.0 m/s)及不同试验温度(25~800 ℃)条件下测试. 涂层微观组织、物相组成及摩擦磨损机理利用SEM、EDS和Raman等表征分析. 结果表明:在25 ℃到800 ℃,涂层的摩擦系数随着温度的增加呈先增加后降低的趋势,400 ℃时摩擦系数达到最高值0.37;800 ℃时摩擦系数降至最低值0.17. 涂层摩擦系数随摩擦速度的增加呈现先降后增的趋势,0.8 m/s时摩擦系数最低,约在0.17~0.29范围内;1.0 m/s时摩擦系数升高至0.20~0.27范围内. 涂层优异的自润滑性能得益于软金属Ag的低剪切性,以及600~800 ℃范围内BaF2/CaF2、Ag与钼酸盐、铬酸盐等高温产物的协同润滑效应.

     

    Abstract: Nickel-alloys matrix self-lubricating composite powder (NiCrMoAl-Ag-BaF2/CaF2) was prepared by high-energy ball milling combined with spray dry granulation method, and a nickel-alloys matrix self-lubricating coating was prepared by plasma spraying technology. A pin-on-disk HT-1000 friction-meter was used to test the friction and wear properties at different rubbing speeds (0.2~1.0 m/s) and under different testing temperatures (25~800 ℃). The microstructures, phase compositions and wear mechanism of the coating were analyzed by scanning electron microscopy, energy dispersive spectroscopy and Raman. The results indicate that at a wide temperature range from 25 ℃ to 800 ℃, the friction coefficient of the coating firstly increased and then decreased with the increasing temperature. The friction coefficient reached the maximum value of 0.37 at 400 ℃; and then reduced to a minimum value of 0.17 at 800 ℃. The friction coefficient of the coating decreased firstly and then increased with increasing sliding speed. The lowest friction coefficient of the coating was about 0.17~0.29 at 0.8 m/s, and then increased to 0.20~0.27 at 1.0 m/s. The favorable lubricating properties of the coating could be attributed to the low shear of the soft metal Ag, and especially the synergistic lubrication effects of BaF2/CaF2, Ag and high-temperature products such as molybdate and chromate rendered the coating with excellent lubricity properties under temperature range of 600~800 ℃.

     

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