Abstract
Diamond-like carbon (DLC) and graphite-like carbon (GLC) coatings have good prospects for improving the surface properties of engine parts. However, further understanding is needed on the effect of working conditions on tribological behaviors. In this study, GLC and two types of DLC coatings were deposited on GCr15 substrate for investigation. The friction and wear properties of self-mated and steel-mated pairs were evaluated. Two temperatures (25 and 90 °C), three lubrication conditions (base oil, molybdenum dithiocarbamate (MoDTC)-containing oil, MoDTC+zinc dialkyldithiophosphate (ZDDP)-containing oil), and high Hertz contact stress (2.41 GPa) were applied in the experiments. The results showed that high temperature promoted the effect of ZDDP on steel-mated pairs, but increased wear under base oil lubrication. The increased wear for steel-mated pairs lubricated by MoDTC-containing oil was due to abrasive wear probably caused by MoO3 and β-FeMoO4. It was also found that in most cases, the tribological properties of self-mated pairs were better than those of steel-mated pairs.
Highlights
In recent years, the increased number of motor vehicles has made automobile exhaust emissions an issue of concern in the society
It was observed that the thickness of graphite-like carbon (GLC) and amorphous carbon (a-C):H coatings was 1.8 μm
Owing to the high internal stress of the tetrahedral amorphous carbon (ta-C) coating, the thickness was controlled at 0.66 μm to ensure the high adhesion strength
Summary
The increased number of motor vehicles has made automobile exhaust emissions an issue of concern in the society. Diamond-like carbon (DLC) coating possesses excellent friction reduction and wear resistance characteristics as well as good chemical inertness [3, 4]. Graphite-like carbon (GLC) coating is mainly comprised of highly disordered sp bonds with small graphite clusters [5] that exhibit good tribological properties and high load capacity under various conditions [6,7,8,9,10]. Both DLC and GLC are excellent candidates for improving the tribological properties
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