Structure and water-lubricated tribological properties of Cr/a-C coatings with different Cr contents |
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| Affiliation: | 1. Department of Immunology, National Institute for Research in Tuberculosis (Formerly Tuberculosis Research Centre), Indian Council of Medical Research, 1, Mayor Sathyamoorthy Road, Chetput, Chennai 600 031, India;2. Department of Clinical Research, National Institute for Research in Tuberculosis (Formerly Tuberculosis Research Centre), Indian Council of Medical Research, 1, Mayor Sathyamoorthy Road, Chetput, Chennai 600 031, India;3. Institute of Thoracic Medicine, Chetput, Chennai-31, India;1. Dept. of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE, USA;2. Dept. of Mechanical Engineering, Jazan University, Gizan, Jazan, Saudi Arabia |
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| Abstract: | The Cr containing amorphous carbon coatings (Cr/a-C) with varying Cr content were deposited using unbalanced magnetron sputtering. The results revealed that the chromium carbide nano-clusters were formed when the Cr content exceeded 4.9 at%. The critical load increased while the hardness decreased after the Cr element incorporation. Although the low Cr containing Cr/a-C coatings (≤4.9 at%) exhibited similar friction coefficient with a-C coatings, but the initial friction coefficient, running-in distance and wear rate of SUS440C balls all decreased. However, the Cr/a-C coatings with high Cr content (11.98–14.09 at%) would worsen the tribological properties because chromium carbides acted as abrasive wear particles during tribotests. |
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| Keywords: | Hydrogen-free carbon based coatings Mechanical properties Microstructure Tribology |
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