Investigation of the tribological properties of the different textured DLC coatings under reciprocating lubricated conditions |
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| Affiliation: | 1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China;1. Ataturk University, Faculty of Engineering, Department of Mechanical Engineering, Erzurum, Turkey;2. Erzurum Technical University, Faculty of Engineering and Architecture, Department of Mechanical Engineering, Erzurum, Turkey;3. Erzincan University, Faculty of Engineering, Department of Mechanical Engineering, Erzincan, Turkey;1. Vienna University of Technology, 1060 Vienna, Austria;2. Pontifical Catholic University of Chile, Santiago de Chile, Chile;3. George Washington University, Washington, USA;4. Federal University of Uberlandia, Brazil;5. Federal University of Rio Grande, Brazil;1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;2. Aviation Key Laboratory of Science and Technology on Life-support Technology, AVIC Aerospace Life-Support Industries, Ltd., Xiangyang 441003, Hubei, China;3. School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China;4. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;5. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi′an Jiaotong University, Xi‘an 710049, Shaanxi, China;6. National-Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei University of Technology, Hefei 230009, Anhui, China;7. Key Laboratory of Interface Science and Engineering of New Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China |
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| Abstract: | In this study, we propose the use of laser surface texturing methods to improve the wear resistance of diamond-like-carbon (DLC) coatings. First, the application of dimples perpendicular to an engineering surface is introduced by using laser in a controlled manner. The solid DLC lubricant is subsequently deposited on the textured surface using the magnetron sputtering technique. In the experiments, the dimple densities were varied from 0 to 30%, and the dimple diameters were varied from 40 to 300 μm. The effect of the geometric parameters on the wear performance was studied using a reciprocating sliding-wear tester under oil lubrication conditions. The results showed that the DLC coatings with the appropriate dimple density (10%) and diameter (～100 μm) demonstrated an obvious improvement in terms of the friction coefficient and wear rate compared with that of the un-textured DLC coatings. The experimental treatment produced respective reductions of 20% in friction and nearly 52% reduction of wear rate. This improvement could be explained by the action of reservoirs that enhance lubricant retention and trap the wear particles during sliding motions. In addition, the relationship between the dimple diameter, the contact width ratio and the wear performance is discussed. |
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