Comparison of the effects of the lubricant-molecule chain length and the viscosity on the friction and wear of diamond-like-carbon coatings and steel |
| |
| Affiliation: | 1. Department of General Science, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand;2. Western Digital Company, Ayutthaya 13160, Thailand;3. Plasma and Beam Physics Research Facility, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;4. Science and Technology Research Institute, Chiang Mai University, Chiang Mai 50200, Thailand;1. Institute of Machines and Motor Vehicles (IMRiPS), Poznan University of Technology, Poland;2. Division of Metrology & Measurement Systems, Poznan University of Technology, Poland;3. Laboratoire de Tribologie et Dynamique des Systèmes (LTDS) - C.N.R.S., École Centrale de Lyon, France;1. Material Science and Engineering, Katip Celebi University, Izmir, Turkey;2. Laboratory of Theoretical Chemistry, Department of Chemistry, University of Maragheh, Maragheh, Iran;3. Department of Chemical Engineering, Izmir Institute of Technology, Izmir, 35430, Turkey;1. Technical Institute of Physics and Chemistry of CAS, Beijing , 100190, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Key Laboratory of Food & Pharmaceutical Quality Processing Storage and Transportation Equipment and Energy-saving Technology, China National Light Industry, Beijing, 100190, China |
| |
| Abstract: | For steel contacts it is usual for the longer molecular chain lengths of saturated linear hydrocarbons and their acids and alcohols to reduce the coefficient of friction in the boundary-lubrication regime. However, the effect of these lubricant properties on DLC contacts is still unknown. Since the boundary-lubrication mechanisms between DLC coatings and conventional additives do not appear to be as effective as with metals, other potential mechanisms, even though based on weaker interactions or the oil's physical and rheological properties, may thus be very relevant. In this study we focus on the influence of the base oil's chain length and viscosity on the friction and wear in DLC/DLC contacts, and we compare this behaviour with conventional steel/steel contacts, using several simple linear hydrocarbons, i.e., alkanes, and complex branched hydrocarbons, i.e., polyalphaolefins. The results show that in both the steel/steel and DLC/DLC contacts the wear decreases with a longer molecular chain length and a higher viscosity of the oil. However, in DLC/DLC contacts the coefficient of friction increases when oil with a longer molecular chain length or a higher viscosity is used, and decreases with the lower oil viscosity and shorter chain lengths, which is just the opposite to conventional steel/steel behaviour. These results are analysed and discussed in view of lubricant cohesive energy, surface tension, shear strength, viscosity and chain length. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
