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Nanocomposite TiC/a-C coatings: structure and properties

Published online by Cambridge University Press:  01 February 2011

Jeff Th. M. De Hosson ,
Yutao Pei ,
Damiano Galvan  and
Albano Cavaleiro
Jeff Th. M. De Hosson
Affiliation:
Dept. of Applied Physics, Materials Science Centre and the Netherlands Institute for Metals Research, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Yutao Pei
Affiliation:
Dept. of Applied Physics, Materials Science Centre and the Netherlands Institute for Metals Research, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Damiano Galvan
Affiliation:
Dept. of Applied Physics, Materials Science Centre and the Netherlands Institute for Metals Research, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Albano Cavaleiro
Affiliation:
Departamento de Engenharia Mecanica, FCTUC - Universidade de Coimbra Pinhal de Marrocos, 3030 Coimbra, Portugal
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Abstract

This contribution deals with fundamental and applied concepts in nano-structured coatings, in particular focusing on the characterization with high-resolution (transmission) electron microscopy. Both unbalanced and balanced magnetron sputtering systems were used to deposit nc-TiC/a-C nanocomposite coatings with hydrogenated or hydrogen-free amorphous carbon (a-C) matrix, respectively. The contents of Ti and C in the coatings have been varied over a wide range (7∼45 at.% Ti) by changing the flow rate of acetylene gas or the locations of substrates relative to the center of C/TiC targets. Different levels of bias voltage and deposition pressure were used to control the nanostructure. The nanocomposite coatings exhibit hardness of 5∼35 GPa, hardness/E-modulus ratio up to 0.15, wear rate of 4.8×10−17 m3/Nm, coefficient of friction of 0.04 under dry sliding and strong self-lubrication effects. The nanostructure and elemental distribution in the coatings have been characterized with cross-sectional and planar high-resolution transmission electron microscopy (HRTEM) and energy filtered TEM. The influences of the volume fraction and size distribution of nano-crystallites TiC (nc-TiC) on the coating properties were examined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 843: Symposium T – Surface Engineering-Fundamentals and Applications , 2004 , T1.6
Copyright
Copyright © Materials Research Society 2005

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References

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