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Volume 15, December 2017, Pages 1-20
Effect of mating materials on wear properties of
amorphous hydrogenated carbon (a-C:H) coating and tetrahedral
amorphous carbon (ta-C) coating in base oil boundary lubrication
condition
Xiang Li, Toshiya Sawaki,
Hiroyuki Kousaka, Motoyuki Murashima, Noritsugu Umehara
Department of Mechanical Science and Engineering, Graduate School of Engineering, Nagoya University,
Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Abstract
In this study, wear behavior of amorphous hydrogenated carbon (a-C:H)
coating and tetrahedral amorphous carbon (ta-C) coating when sliding
against various mating materials in base oil boundary lubrication
condition is comparatively investigated to find out the optimal
combinations of DLC/mating material and corresponding wear mechanism
of both DLC coating. Tribological tests were performed in a
cylinder-on-disc tribometer, Field Emission Scanning Electron
Microscopy, Raman spectroscopy is used for characterization of ta-C
and a-C:H worn surface. The results show that the specific wear rate
of ta-C coating increases along with the hardness and roughness of
mating material increases, while the specific wear rate of a-C:H
coating increases together with an increment in the
ID/IG
ratio. It is concluded that
for ta-C coating, local stress concentration-induced microfracture
is the main wear mechanism in relative high wear scenario, along
with minor graphitization-induced wear which prevails in low wear
scenario. On the other hand, a-C:H coating showed that simultaneous
generation and removal of the graphitized layer on the contact
surface is the predominant wear mechanism.
Keywords
DLC; Wear resistance; Boundary lubrication; Mating material
Full Text
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