Tribological properties of epoxy nanocomposites: III. Characteristics of transfer films |
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| Affiliation: | 1. Institute for Composite Materials, University of Kaiserslautern, 67663 Kaiserslautern, Germany;2. National Center for Nanoscience and Technology, No. 2, 1st North Street Zhongguancun, 100080 Beijing, PR China;3. Centre for Advanced Materials Technology, School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia;1. Flupol, Surface Engineering, S.A. Rua da Central, 401, Campo, 4440-043 Valongo, Portugal;2. LEPABE – Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;3. CETRIB, Tribology, Vibration and Industrial Maintenance Unit, INEGI, Institute of Mechanical Engineering and Industrial Management, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Federal Institute for Materials Research and Testing (BAM), 12205 Berlin, Germany;1. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206W. Green Street, Urbana, IL 61801, USA;2. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA;1. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, UP 208016, India;2. Department of Mechanical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India;1. Centre for Advanced Materials Technology, School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia;2. National Centre for Nanoscience and Techology, Beijing 100190, PR China;1. Department of Material Science and Engineering, University of Wisconsin Milwaukee, 3200N Cramer St., Milwaukee, WI 53211, USA;2. Department of Mechanical Engineering, University of Wisconsin Milwaukee, 3200N Cramer St., Milwaukee, WI 53211, USA |
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| Abstract: | The multiple parts of this study are intended to experimentally and analytically elaborate the tribological properties of epoxy nanocomposites, reinforced by short carbon fibres (SCF), nano-TiO2 particles, polytetrafluorethylen (PTFE) powders and graphite flakes, in order to understand the role of fillers in modifying the wear behaviour of the materials. In this part, the influences of two solid lubricants, PTFE and graphite, were studied and compared. The transfer films established with two lubricants in sliding wear of epoxy nanocomposites against metallic counterparts were characterised under different sliding conditions. The morphology of transfer films was examined using scanning electronic microscopy (SEM), while their mechanical properties were investigated using micro-hardness tests. A method was proposed to determine the thickness of transfer films based on micro-indentation. The role of transfer films in dissipation of frictional heating was also studied. Epoxy nanocomposites containing both PTFE powders and graphite flakes showed a synergised effect in wear performance, especially under very severe wear conditions. |
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