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Sputtered Coatings Based on the Al2Au Phase

Published online by Cambridge University Press:  26 February 2011

Christian Mitterer ,
Helmut Lenhart ,
Paul H. Mayrhofer  and
Martin Kathrein
Christian Mitterer
Affiliation:
Department of Physical Metallurgy and Materials Testing, University of Leoben, Franz-JosefStrasse 18, A-8700 Leoben, Austria
Helmut Lenhart
Affiliation:
Department of Physical Metallurgy and Materials Testing, University of Leoben, Franz-JosefStrasse 18, A-8700 Leoben, Austria
Paul H. Mayrhofer
Affiliation:
Department of Physical Metallurgy and Materials Testing, University of Leoben, Franz-JosefStrasse 18, A-8700 Leoben, Austria
Martin Kathrein
Affiliation:
CERATIZIT Austria GmbH, A-6600 Reutte, Austria
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Abstract

Transition metal nitride-based, wear-resistant hard coatings on cutting tools and other substrates often lack distinct colorations allowing product differentiation and self-lubricating properties. In the present work, the possibility of achieving these objectives for sputtered coatings based on the purple-red Al2Au phase within the Al-Au system was investigated. Coatings were characterized with respect to morphology, chemical and phase composition, hardness, optical, oxidation and tribological properties. Al2Au-containing coatings were deposited with dense, fine-grained structures yielding a hardness of 4 GPa and pink coloration. The coatings were stable up to about 850°C, where the onset of oxidation occurs. Low friction coefficients against alumina were achieved between 500 and 700°C. The concept of applying Al2Au-containing coatings as a colored self-lubricating layer on top of a hard coated cemented carbide tool warrants further investigations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S5.38
Copyright
Copyright © Materials Research Society 2005

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