In situ Acoustic Emission for wear life detection of DLC coatings during slip-rolling friction |
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| Affiliation: | 1. Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran;2. Center of Nano Research, Ferdowsi University of Mashhad, 9177948974, Iran;3. Par-e-Tavous Research Institute, Mashhad, Iran;1. Laboratory of Biomechanics and Implant Research, Clinic for Orthopedics and Trauma Surgery, Center for Orthopedics, Trauma Surgery and Spinal Cord Injury, Heidelberg University Hospital, Schlierbacher Landstr. 200A, Heidelberg, Germany;2. Biometrics Consulting and Project Management, University Heidelberg, Im Neuenheimer Feld 130, Heidelberg, Germany;3. Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Str. 1-7, Hannover, Germany;4. BG Trauma Center, Ludwig-Guttmann-Str. 13, Ludwigshafen, Germany |
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| Abstract: | Different diamond-like carbon (DLC) coatings on a steel substrate (100Cr6) were tested under slip-rolling friction conditions against uncoated counter bodies of the same steel. The initial maximum Hertzian pressure was varied in a range of P0 = 1.5–2.3 GPa. The friction tests were carried out under dry conditions and with an unadditivated paraffin oil as lubricant. It could be shown that the thickness of the coatings affects the respective wear life. Further, a very important factor for the wear life of a coating under lubricated slip-rolling conditions is the roughness of the surface of the respective counterbody. The wear life tests were monitored by recording in situ the Acoustic Emission (AE) signals. Some causes for a high AE activity could be identified. |
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