Nano-texture for a wear-resistant and near-frictionless diamond-like carbon |
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| Affiliation: | 1. Department of Chemical Engineering and Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA;2. Energy Systems Division, Argonne National Laboratory, Argonne, IL 60439, USA;1. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China;2. Computational Science Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea;1. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;2. Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730000, China;3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;1. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria;2. Teer Coatings, Berry Hill Industrial Estate, West Stone House, Droitwich WR9 9AS, UK;3. JOANNEUM RESEARCH Forschungsgesellschaft mbH, Leonhardstraße 59, A-8010 Graz, Austria;4. Materials Chemistry, RWTH Aachen University, Kopernikusstraße 10, D-52074 Aachen, Germany;5. MIBA High Tech Coatings, Dr.-Mitterbauer-Straße 3, A-4655 Vorchdorf, Austria;1. Tribology Research Institute, Key Laboratory for Advanced Technology of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, PR China;2. Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA;3. Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16802, USA;4. Department of Chemical Engineering, Pennsylvania State University, University Park, PA 16802, USA |
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| Abstract: | The effect of nano-scale surface texture on wear resistance of diamond-like carbon (DLC) films was studied using a reciprocating ball-on-flat tribometer in dry, humid, and liquid water environments. The nano-scale surface texture was produced by depositing ～1 μm thick DLC films onto silicon substrates pre-textured with pyramidal wells and polystyrene spheres. The surface roughness of the textured DLC films was about 50 nm in both cases. The friction and wear behavior of the flat and nano-textured DLC films were tested with AISI 440C-grade stainless steel balls at a contact load creating about 360 nm deep Hertzian deformation which is significantly larger than the surface roughness. At this condition, nano-texturing did not affect the friction coefficient, but it significantly reduced the wear of DLC films in dry and humid nitrogen compared to flat DLC. In dry nitrogen, the nano-textured DLC films showed the ultra-low friction without substantial wear of DLC and deposition of thick transfer films onto the counter-surface. The wear reduction appeared to be related to the stress relief in the nano-textured DLC film. In liquid water, surface features on the nano-textured DLC films were diminished due to tribochemical oxidation and material removal at the sliding interface. |
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