Authors: Kumar, N; Dash, S; Kamruddin, M; Das, C R; Chandramohan, P; Srinivasan, M P; Tyagi, A K; Raj, B

Source: Tribology - Materials, Surfaces & Interfaces, Volume 5, Number 4, December 2011 , pp. 172-176(5)

Publisher: Maney Publishing

Abstract:

Gas phase carburisation of titanium in CH₄ atmosphere was carried out in a thermogravimetric analyser. The analysis revealed the formation of TiC phase embedded in an amorphous carbon (a-C) matrix. Raman scattering investigation revealed the evolution of two separate peaks corresponding to D and G band vibrational modes in a hexagonal sp2 phase of the graphite-like structure. The tribological properties of this coating relied significantly on the relative extent of D and G band modes with the evolution of TiC phase. A sharp transition of friction from lower to higher value was observed due to the wearing out of tribolubricant phases of TiC with disordered graphite-like structure present in the a-C matrix. In case of thicker coating, a lower regime of friction was observed with longer wear distances.

Keywords: Composite coatings; Wear; Friction; TiC/a-C

Document Type: Original Article

DOI: http://dx.doi.org/10.1179/1751584X11Y.0000000019

Publication date: 2011-12-01

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