Effect of laser surface texturing on Si3N4/TiC ceramic sliding against steel under dry friction |
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| Affiliation: | 1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. Department of Mechanical Engineering, Indian Institute of Technology, Varanasi 221005, India;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. 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. 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 |
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| Abstract: | In efforts to investigate the influence of the surface texturing on the Si3N4/TiC ceramic, laser surface texturing (LST) was performed on the Si3N4/TiC ceramic by an Nd:YAG laser and different geometrical characteristics of regular-arranged micro-grooved textures were fabricated on the surfaces. The tribological properties of the textured and smooth samples were investigated by carrying out sliding wear tests against steel balls under dry condition using a ball-on-disk tribometer. Effect of surface texturing on the stress distribution was studied by finite element method (FEM). Results show that the textured surfaces exhibited lower friction coefficient and excellent anti-wear properties compared with smooth surfaces. The tribological characteristics depended greatly on the size and density of the micro-grooves, and the geometrical characteristics of the surface textures have a significant effect on the tribological behavior. Among the patterns investigated, the wavy-grooved samples exhibit the lowest friction coefficient and wear rate; and a large texture density may be the best for reduction of friction and wear of textured samples. While, the wear rate of balls sliding against textured surfaces is larger than that of balls sliding against smooth surfaces. FEM results show that surface texturing can improve the stress distribution of contact interfaces and reduce stress concentration. |
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| Keywords: | Laser surface texturing Friction Wear Ceramic matrix composite |
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