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Environmental effects on friction and wear of diamond and diamondlike carbon coatingsReciprocating sliding friction experiments were conducted with a natural diamond flat, diamond film, and low and high density diamondlike carbon (DLC) films in contact with pin specimens of natural diamond and silicon nitride (Si3N4) both in humid air and dry air nitrogen. The results indicated that for natural diamond pin contacts the diamond films and the natural diamond flat were not susceptible to moisture but that moisture could increase both the coefficient of friction and the wear factors of the DLC films. The coefficients of friction and wear factors of the diamond films were generally similar to those of the natural diamond flat both in humid air and dry air nitrogen. In dry nitrogen the coefficients of friction of the high density DLC films in contact with pin specimens of both diamond and Si3N4 were generally low (about 0.02) and similar to those of the natural diamond flat and the diamond films. The wear factors of the materials in contact with both natural diamond and Si3N4 were generally in the ascending order of natural diamond flat, diamond film, high density DLC film, and low density DLC film. The moisture in the environment increased the coefficients of friction for Si3N4 pins in contact with all the materials. This increase in friction is due to the silicon oxide film produced on the surface of Si3N4 pins in humid air.
Document ID
19920013949
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Miyoshi, Kazuhisa (NASA Lewis Research Center Cleveland, OH, United States)
Wu, Richard L. C. (NASA Lewis Research Center Cleveland, OH, United States)
Garscadden, Alan (Wright Lab. Wright-Patterson AFB, OH., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1992
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.15:105634
E-6977
NASA-TM-105634
Meeting Information
Meeting: International Conference on Metallurgical Coatings and Thin Films
Location: San Diego, CA
Country: United States
Start Date: April 6, 1992
End Date: April 10, 1992
Sponsors: American Vacuum Society
Accession Number
92N23192
Funding Number(s)
PROJECT: RTOP 506-43-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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