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Microstructure and Wear Characterization of Selflubricating Al2O3 - MoS2 Composite Ceramic Coatings

Published online by Cambridge University Press:  28 February 2011

K.A. Koshkarian  and
W.M. Kriven
K.A. Koshkarian
Affiliation:
Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 105 South Goodwin Avenue, Urbana, IL 61801
W.M. Kriven
Affiliation:
Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 105 South Goodwin Avenue, Urbana, IL 61801
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Abstract

Composite ceramic coatings of alumina (A1203) containing some molybdenum disulfide (MoS2) were electro-codeposited on to Al metal substrates by a combination of anodic sparks deposition of A1203 and electrophoresis of MoS2. The microstructures were characterized by XRD, XPS, SEM, EDS, SNMS,TEM, SAD and relative wear resistance measurements. The coatings consisted mostly ofa-A1203 with some γ and βpresent as well. The coatings were porous and microcracked. SEM showed them to consist of circular “splats” which had rapidly crystallized from the molten state in areas ofdielectric breakdown in the coating. In the TEM the microstructure was seento contain “sets” of parallel, elongated grains having a single crystallographic orientation. The grains were separated by dislocated, low angle grain boundaries or microcracks. The sets intersected at irregularly curved interfaces and were mechanically interlocked. Quantitative SNMS indicated that up to 26 wt% MoS2 was incorporated in coatings fabricated from 5g\1 solutions. SEM\EDS as well as TEM\SAD\EDS identified 1-3μm particles of MoS2 incorporated into the 5g\1 solution derived coatings. These coatings exhibited a 50% lower wear rate than pure alumina coatings deposited under the same conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 140: Symposium S – New Materials Approaches to Tribology: Theory and Applications , 1988 , 369
Copyright
Copyright © Materials Research Society 1989

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