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Effect of surface laser texture on friction properties of nickel-based composite |
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| Authors: | Jianliang Li Dangsheng Xiong Jihui Dai Zhongjia Huang Rajnesh Tyagi |
| Affiliation: | 1. Tribology Group, Department of Mechanical Engineering, Imperial College London, South Kensington, Exhibition Road, SW7 2AZ London, United Kingdom;2. Ford Motor Company, Dunton, Essex, United Kingdom;1. Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia, Via Campi 213/A, 41125, Modena, Italy;2. Istituto CNR-NANO S3, Via Campi 213/A, 41125, Modena, Italy;3. Dipartimento di Scienze della Vita, Università di Modena e Reggio Emilia, Via Campi 287, 41125, Modena, Italy;4. Centro Interdipartimentale per la Ricerca Applicata e i Servizi nella Meccanica Avanzata e nella Motoristica Intermech-Mo.Re., Università di Modena e Reggio Emilia, Via Vignolese 905/b, 41125, Modena, Italy;1. School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730000, PR China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, PR China;1. Department of Mechanical Engineering, Graduate School, Kyungpook National University,;2. Department of Architectural Engineering, Graduate School, Chosun University, 501-759,;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China;2. University of Chinese Academy of Sciences, Beijing, China |
| Abstract: | Laser surface texturing (LST) was performed on the nickel-based composites by a Nd:YAG pulsed laser and the regular-arranged dimples with diameter of 150 μm were fabricated on their surfaces. The textured surfaces were smeared with molybdenum disulfide powder. The tribological properties of the textured and filled composites were investigated by carrying out sliding wear tests against an alumina ball as a counterface using a high temperature ball-on-disk tribometer. The tests were conducted at a sliding speed of 0.4 m/s and at normal loads ranging from 20–100 N and from room temperature to 600 °C. The friction coefficient of nickel-based composite textured and smeared with molybdenum disulfide was found to reduce from 0.18 to 0.1 at the temperature range from 200 to 400 °C. The texture with a dimple density of 7.1% was observed to prolong wear life of MoS2 film by more than four times in comparison to the texture with other dimple densities. The lubricious oxide particles stored in the dimples reduce friction coefficient at elevated temperatures and compensate for the extra lubricant owing to the degradation of MoS2 caused by its oxidation at high temperatures. |
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