Nanohardness vs. Friction Behavior in Magnetron Sputtered and PECVD W-C Coatings

The nanoindentation and tribological measurements were performed on DC and RF magnetron sputtered W-C coatings to optimize the deposition conditions to obtain maximum nanohardness and to compare their properties and behavior with earlier studied PECVD W-C coatings. Despite number of similarities, so...

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Bibliographic Details
Published in:Key engineering materials 2014-01, Vol.586, p.35-38
Main Authors: Hornak, Peter, Lofaj, František, Ferdinandy, Milan
Format: Article
Language:English
Subjects:
Carbon
Chemical vapor deposition
Coatings
Direct current
Friction
Magnetic properties
Nanohardness
Tungsten
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Summary:The nanoindentation and tribological measurements were performed on DC and RF magnetron sputtered W-C coatings to optimize the deposition conditions to obtain maximum nanohardness and to compare their properties and behavior with earlier studied PECVD W-C coatings. Despite number of similarities, some consequences of a tribo-chemical transfer film formation are inconsistent with the existing wear model for W-C coatings with controlled carbon content. Transfer films in the friction contact consist from iron- and tungsten oxides and carbon generated during carbide oxidation. The role of carbon in the transfer films leading to high coefficients of friction has to be principally different from the expected lubricative role of carbon in W-C coatings and needs further study.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.586.35