Sputter deposited nanostructured Au-WS2 solid lubricant coatings

Deepthi, B and Srinivas, G and Praveen, Kumar and Sridhara Rao, DV and Barshilia, Harish C (2012) Sputter deposited nanostructured Au-WS2 solid lubricant coatings. Nanoscience and Nanotechnology letters, 4 (1). pp. 53-60. ISSN 1941-4900

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Abstract

Au-WS2 nanocomposite coatings with approximately 60 at.% Au were prepared using magnetron sputtering from high purity Au and WS2 targets. Structural characterization of the coatings using X-ray diffraction indicated the presence of (111), (200) and (220) peaks of cubic Au and broad bands corresponding to (002) and (004) planes of hexagonal WS2. Surface morphology of Au-WS2 coatings was studied using field emission scanning electron microscopy (FESEM) and atomic force microscopy which showed formation of uniformly distributed interconnected ligament-like features. High resolution transmission electron microscopy studies showed the presence of a two phase nanocomposite structure wherein nanocrystalline Au was dispersed in a matrix of nanocrystalline and amorphous WS2. The electrical resistivity of Au-WS2 coating measured using four-point-probe method was approximately 0.2 m compared to Au and WS2 coatings which exhibited electrical resistivity values of approximately 0.04 m and 0.057 m, respectively. Ball-on-disc reciprocating tests at a load of 7 N showed that Au-WS2 nanocomposite coating exhibited a friction coefficient of 0.22 after 57,600 cycles and outperformed Au and WS2 coatings. Analyses of the ball and wear track of Au-WS2 coating using FESEM at the end of the wear test indicated formation of smooth transfer films, less accumulation of wear debris and reduced oxidation.

Item Type: Article
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Dr. Harish C. Barshilia
Date Deposited: 07 Feb 2012 06:14
Last Modified: 13 Mar 2012 06:21
URI: http://nal-ir.nal.res.in/id/eprint/10028

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