Study on the Lubrication Mechanism of Titanium Alloys with Surface Dimples Filled with Sn-Ag-Cu and TiC under Dry Slidin
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JMEPEG https://doi.org/10.1007/s11665-020-05092-2
Study on the Lubrication Mechanism of Titanium Alloys with Surface Dimples Filled with Sn-Ag-Cu and TiC under Dry Sliding Friction Bing Xue, Zhenyu Yang, Xiaoliang Shi, Hongyan Zhou, Guanchen Lu, Yawen Xue, Jin Zhang, and Chaohua Wu (Submitted July 13, 2020; in revised form August 3, 2020) Improving the tribological performance of TC4 has far-reaching significance for its wide application in the field of automobile and robot. The lubricating behaviors of TC4 with mixed solid lubricant (Sn-Ag-Cu with TiC) filled into surface dimples (TAC) during dry rotary sliding were systematically investigated. The results show that TAC has better tribological properties than TC4 and TC4-P. It attributes to the synergistic effect of surface dimples and mixed solid lubricant. The mixed solid lubricant in dimples is easier to be extruded to the frictional interface. The uniform and wear-resistant lubricating layer containing SAC and TiC is formed on the worn surface of TAC, reducing the direct impact of counterpart ball on substrate material. The fluidity of SAC endows TAC with the ability of self-repairing. Keywords
lubricating layer, mixed solid lubricant, self-repairing, surface dimples, synergistic effect, TC4
1. Introduction Titanium and its alloys have a wide range of successful applications in aerospace, transportation, frame construction and biomedicine (Ref 1-6) due to their excellent properties, such as great corrosion resistance, excellent thermal stability, high specific strength and low density. However, the tribological performance of titanium alloy is unsatisfactory due to low plasticity and shear strength (Ref 7, 8), which limits the applications of titanium alloy in bearings and frictional moving parts (Ref 9, 10). The development of new high-performance bearings will benefit a lot, if the tribological properties of titanium alloys can be strengthened in some way. Therefore, the research on improving the tribological properties of titanium alloys has far-reaching significance. As the most common lubricating method, liquid lubrication has been extensively studied by researchers. The lubrication behaviors of Ga76In24 (LM) in steel/steel contact under different contact stresses and sliding speeds were investigated by Li et al. (Ref 11), and they found that Ga76In24 friction and wear resistance were improved by surface texture. Etsion et al. (Ref 12) studied the effect of the contact surface microstructure on liquid lubricants and found that surface texture played a sealing role, made the effectiveness of lubricants more fully. Bing Xue and Zhenyu Yang have contributed equally to this work. Bing Xue, Yellow River Conservancy Technical Institute, Kaifeng 475004, China; and Zhenyu Yang, Xiaoliang Shi, Hongyan Zhou, Guanchen Lu, Yawen Xue, Jin Zhang, and Chaohua Wu, School of Mechanical and Electronic Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China. Contact e-mail: [email protected].
Journal of Materials Engineering and Performance
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