Mechanical and tribological properties of amorphous carbon films |
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Authors: | Gangopadhyay Arup |
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Affiliation: | (1) Ford Motor Company, Dearborn, MI 48121, USA |
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Abstract: | The mechanical and tribological properties of amorphous carbon films have been studied in more detail in recent years because
these films (a) can be deposited near room temperature, thus allowing film deposition on common engineering alloys (i.e.,
aluminum and steel) without altering their mechanical properties, and (b) are smooth and conform to surface roughness of the
substrate, thus requiring no post deposition processing. In addition, amorphous carbon films exhibit low unlubricated sliding
friction in contact with steel and ceramics which is comparable to that of steel against steel in a lubricated contact. The
wear resistance of these films is also better than Ti‐based hard coatings. Further improvement in film tribological properties
can be achieved by modifying film chemical composition. Because of these attractive features, amorphous carbon films have
been evaluated in several applications including automotive, electronic and biomedical engineering. However, environmental
factors such as oxygen and humidity have been found to influence tribological properties significantly. This paper reviews
the current understanding of the tribological properties of both hydrogenated and non‐hydrogenated amorphous carbon films,
the mechanisms responsible for low friction coefficient and identifies areas that require further research.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | hydrogenated non‐ hydrogenated amorphous carbon thin films friction wear lubrication environment |
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