Journal
DIAMOND AND RELATED MATERIALS
Volume 112, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2020.108226
Keywords
Ta-C coatings; Cr-diamond coatings; CrN coatings; Friction and wear; Low-viscosity oil; Cyclic start; stop
Categories
Funding
- National Key RAMP
- D Program of China [2018YFC0810500]
- National Natural Science Foundation of China [51605026]
- Fundamental Research Funds for the Central Universities [FRF-TP-18011A2]
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The study showed that low-viscosity oil can significantly improve the tribological properties of ta-C coatings, resulting in lower friction coefficients and wear rates under different testing temperatures. Ta-C coatings exhibited superior low temperature cycle starting performance when lubricated by low-viscosity oil, with a speculated synergistic effect between the oil and nanoscale adaptive tribofilm for achieving lower friction and wear simultaneously. The lubrication adaptability of low-viscosity oil to ta-C coatings is technologically important and provides high potential for industrial application in lubrication and wear prevention under actual conditions.
Current emphasis on automotive engine has evoked the desire to improve tribological performance by both reducing friction and making starting easier in the automotive industry. The present study was conducted to determine the effects of viscosity of fully-formulated oil on tribological properties of the typical coatings for automotive engine components, e.g. ta-C, CrN and Cr-diamond coatings, under simulated lubrication conditions. Results showed that compared to Cr-diamond and CrN coating, the ta-C coating exhibited superior tribological properties with the lowest friction coefficients and wear rates under various testing conditions. Low-viscosity oil 0W-20 could significantly improve the tribological properties of ta-C coatings at different testing temperatures. Furthermore, in cyclic start/stop tests, ta-C coatings have been proven to possess excellent low temperature cycle starting performance when lubricated by low-viscosity oil. A synergistic effect of the low-viscosity oil and a nanoscale adaptive tribofilm was speculated for ta-C coatings to be responsible for achieving lower friction and wear simultaneously. The lubrication adaptability of low-viscosity oil to ta-C coating is technologically important and provides a high potential of industrial application for lubrication and wear prevention under actual conditions.
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