Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/27273
Title: Ultra-low friction W–S–N solid lubricant coating
Authors: Gustavsson, Fredrik 
Jacobson, Staffan 
Cavaleiro, Albano 
Polcar, Tomas 
Keywords: Tungsten disulfide; Ultra-low friction; Self-lubricant; Coating; Magnetron sputtering
Issue Date: 15-Oct-2013
Publisher: Elsevier
Citation: GUSTAVSSON, Fradrik [et. al] - Ultra-low friction W–S–N solid lubricant coating. "Surface and Coatings Technology". ISSN 0257-8972. Vol. 232 (2013) p. 541-548
Serial title, monograph or event: Surface and Coatings Technology
Volume: 232
Abstract: W–S–N films were deposited by reactive magnetron sputtering from WS2 target in Ar/N2 atmosphere. Besides the standard evaluation of composition, structure, morphology, hardness and cohesion/adhesion, the core objective of this paper was to analyze coating tribological behavior. The chemical composition was 34 at.% N, 12 at.% O, 29 at.% W and 25 at.% S, and the as-deposited films were completely amorphous. The film thickness was 2.3 μm, including the approximately 300-nm thick adhesion improving titanium interlayer. The friction coefficient was lower than 0.003 when sliding in dry nitrogen. The coating showed remarkable wear resistance surviving more than 2 million laps on pin-on-dics. The excellent friction properties were attributed to the formation of a thin tungsten disulfide tribofilm on the top of the wear track of the coating and on the counterpart surface. Moreover, the coating showed ability to replenish damaged areas with solid lubricant. We demonstrated that a structural transformation of the coating from an amorphous-like to a gradient quasi-ordered structure and an ordered transfer layer formation improved mechanical properties and radically decreased friction and wear.
URI: http://hdl.handle.net/10316/27273
ISSN: 0257-8972
DOI: 10.1016/j.surfcoat.2013.06.026
Rights: openAccess
Appears in Collections:I&D CEMUC - Artigos em Revistas Internacionais
FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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