Effect of structure of carbon films on their tribological properties |
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| Affiliation: | 1. Dept. of Materials Science and Engineering, Technion, Haifa 32000, Israel;2. Dept. of Nuclear Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;3. Advanced Coatings Center, Rotem Industries Ltd., Mishor Yamin, D.N. Arava 86800, Israel;4. Solid State Institute, Technion, Haifa 32000, Israel;5. Dept. of Mechanical Engineering, Technion, Haifa 32000, Israel;1. Bialystok University of Technology, Faculty of Mechanical Engineering, Poland;2. Regional Hospital of J. Sniadecki, Bialystok, Poland;3. Warsaw University of Technology, Faculty of Materials Science, Poland;1. Instituto de Investigaciones en Materiales, UNAM, circuito exterior s/n, CU, México DF 04510, Mexico;2. Departamento de Física, ININ, Apdo. Postal 18-1027, México DF 11801, Mexico;3. Departamento de Ingeniería de Proyectos, CUCEI, Universidad de Guadalajara, Apdo. Postal 307, CP 45101 Zapopan, Jalisco, Mexico |
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| Abstract: | A comparative study of the tribological properties of a library of different carbon forms is presented. The library includes hydrogen free and hydrogenated carbon films with different bonding (C C, CH, different sp3 fractions) and structure configurations (amorphous, graphitic) leading to a wide range of densities and hardness. Reference samples (Si substrates, thermally evaporated amorphous carbon, graphitic foil) were studied as well. The tribological properties were measured using a reciprocal sliding tribometer under humid (50% RH) and dry (5% RH) air conditions. Friction coefficients were measured versus the number of sliding cycles and the wear was studied using optical profilometry and imaging as well as SEM.The friction and wear performance of the carbon films were found to depend on both the structure and the ambient conditions. Hydrogen free films have friction coefficients < 0.1 for 80% sp3 bonded films and > 0.1 for 100% sp2 bonded films. The wear resistance of the hydrogen free films (much larger for sp3 bonded films) significantly decreases under dry conditions. In contrast, hydrogenated films show reduction in friction with decreasing humidity (from 0.2 under 50% RH to < 0.1 under 5% RH). The wear resistance of hydrogenated films is larger for dry and smaller for humid conditions. |
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