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Tribomechanical Property Modification of Commercial TiN Coatings by Carbon Ion Implantation

Published online by Cambridge University Press:  22 February 2011

L.J. Liu
Affiliation:
Microelectronics and Materials Technology Centre, Royal Melbourne Institute of Technology, 124 La Trobe Street, Melbourne 3000, Australia.
D.K. Sood
Affiliation:
Microelectronics and Materials Technology Centre, Royal Melbourne Institute of Technology, 124 La Trobe Street, Melbourne 3000, Australia.
R.R. Manory
Affiliation:
Department of Chemical and Metallurgical Engineering.
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Abstract

About 2 μm thick commercial coatings of TiN on high speed steel substrates were implanted at room temperature with 95 keV carbon to nominal doses between 1 × 1017 and 8×1017 ions cm-2. An ultra-microhardness apparatus (UMIS-2000) was used to measure hardness, and a pin-on-disc machine (CSEM Tribometer) with a sapphire ball was used to measure wear, friction and adhesion. Carbon implantation induced a significant improvement in ultra-microhardness, friction coefficient and wear properties. The surface microhardness increases monotonically by up to 115% until a critical dose φ crit is reached. Beyond this dose the hardness decreases, but remains higher than that of unimplanted sample. A lower friction coefficient and a longer transition period towards a steady state condition were obtained by implantation. An improvement of up to four times in the wear is obtained after carbon implantation. Topology studies with SEM show a change in the mode of wear. The changes in tribomechanical properties are discussed in terms of radiation damage and possible second phase formation.

Type
Research Article
Copyright
Copyright © Materials Research Society 1994

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