EFFECT OF SUBSTRATE BIAS ON FRICTION COEFFICIENT, ADHESION STRENGTH AND HARDNESS OFTiN-COATED TOOL STEEL

Esah Hamzah (), Mubarak Ali () and Mohd Radzi Hj. Mohd Toff ()
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Esah Hamzah: Department of Materials Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia 81310, Skudai, Johor, Malaysia
Mubarak Ali: Department of Materials Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia 81310, Skudai, Johor, Malaysia
Mohd Radzi Hj. Mohd Toff: Advanced Materials Research Center (AMREC), SIRIM Berhad, Lot 34, Jalan Hi-Tech 2/3, Kulim Hi-Tech Park, 09000 Kulim, Kedah, Malaysia

Surface Review and Letters (SRL), 2006, vol. 13, issue 06, 763-771

Abstract: In the present study,TiNcoatings have been deposited on D2 tool steel substrates by using cathodic arc physical vapor deposition technique. The objective of this research work is to determine the usefulness ofTiNcoatings in order to improve the micro-Vickers hardness and friction coefficient ofTiNcoating deposited on D2 tool steel, which is widely used in tooling applications. A Pin-on-Disc test was carried out to study the coefficient of friction versus sliding distance ofTiNcoating deposited at various substrate biases. The standard deviation parameter during tribo-test result showed that the coating deposited at substrate bias of -75 V was the most stable coating. A significant increase in micro-Vickers hardness was recorded, when substrate bias was reduced from -150 V to zero. Scratch tester was used to compare the critical loads for coatings deposited at different bias voltages and the adhesion achievable was demonstrated with relevance to the various modes, scratch macroscopic analysis, critical load, acoustic emission and penetration depth. A considerable improvement inTiNcoatings was observed as a function of various substrate bias voltages.

Keywords: Cathodic arc; TiN; substrate bias; friction coefficient; adhesion; microhardness (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1142/S0218625X06008827

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