Torsional Fretting Wear Behavior of Bonded MoS2 Solid Lubricant Coatings |
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| Authors: | J. Luo Z. B. Cai J. L. Mo J. F. Peng M. H. Zhu |
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| Affiliation: | 1. Tribology Research Institute, Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031, China;2. Engineering Research Center for Materials Protection of Wear and Corrosion of Guizhou Province, University of Guizhou Province, College of Chemistry and Materials Engineering, Guiyang University, Guiyang 550005, China |
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| Abstract: | The effects of applying a bonded MoS2 solid lubricant to a 1050 steel substrate were investigated using a torsional fretting wear apparatus. Tests were conducted under a normal load of 50 N with angular displacement amplitudes ranging from 0.1 to 5°. Wear scars were examined using scanning electron microscopy, energy-dispersive X-ray spectrometry, optical microscopy, and surface profilometry. The MoS2 coating exhibited different torsional fretting regimes than those of the substrate. Fretting regimes of the coating were primarily in the partial slip regime (PSR) and the slip regime (SR) with no mixed fretting regime. The width of the PSR narrowed. Due to the lubricating effects of the coating, the friction torque was consistently lower than that of the substrate. The damage to the coating in the PSR was very slight, and its granular structure remained even after 1,000 cycles. The damage mechanism to the SR coating was a combination of abrasive wear, oxidative wear, and delamination. The MoS2 coating had potential to alleviate torsional fretting wear. |
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| Keywords: | Fretting Wear Torsional Fretting Bonded MoS2 Solid Lubricant Coating 1050 Steel Damage Mechanism |
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