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Nanostructure, mechanical and tribological properties of reactive magnetron sputtered TiC(x) coatings

Polychronopoulou, K, Rebholz, C, Baker, MA, Theodorou, L, Demas, NG, Hinder, SJ, Polycarpou, AA, Doumanidis, CC and Boebel, K (2008) Nanostructure, mechanical and tribological properties of reactive magnetron sputtered TiC(x) coatings DIAMOND AND RELATED MATERIALS, 17 (12). 2054 - 2061. ISSN 0925-9635

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Abstract

This study describes the correlation between the microstructure, mechanical and tribological properties of Ti1-xCx coatings (with x being in the range of 0-1), deposited by reactive magnetron sputtering from a Ti target in Ar/C2H2 mixtures at ~200 °C. The mechanical and tribological properties were found to strongly depend on the chemical composition and the microstructure present. Very dense structures and high hardness and elastic modulus values, combined with low wear rates, were observed for films with chemical composition close to TiC. X-ray diffraction studies showed that the coating deposited at high C2H2 flow rates composed of randomly oriented TiC crystallites. Morphological investigations by scanning electron microscopy indicate that the morphology is strongly dependent on the carbon content of the coating. Coatings overall composition, and relative phase fraction are investigated using X-ray photoelectron spectroscopy. The presence of free amorphous carbon as DLC was found in the case of the coatings deposited at 43 and 50 sccm of C2H2, where this is not the case for coatings deposited at lower C2H2 flow rates. Both the mechanical properties and tribological 2 performance of the coatings were found to be dependent on carbon content and the optimum performance was that of the coating deposited at 43 sccm where a nanocomposite dual system is formed.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Diamond and Related Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Diamond and Related Materials, 17(12), December 2008, DOI 10.1016/j.diamond.2008.07.007
Uncontrolled Keywords: Science & Technology, Technology, Materials Science, Multidisciplinary, Materials Science, Diamond-like carbon, Nanocrystalline, sputtering, Tribology, C-H COATINGS, NANOCOMPOSITE COATINGS, LOW-FRICTION, COMPOSITE COATINGS, CARBON-FILMS, MICROSTRUCTURE, METAL, WEAR, DEPOSITION, LUBRICANT
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Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 16 Nov 2012 09:15
Last Modified: 23 Sep 2013 19:52
URI: http://epubs.surrey.ac.uk/id/eprint/738444

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