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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2004, Volume8

168 pages

DOI: 10.1615/HighTempMatProc.v8.i2

Issue price - $144.00

INVESTIGATION OF PHENOMENA INFLUENCING PROPERTIES OF PLASMA SPRAYED CERAMIC-METAL COMPOSITE DEPOSITS

A. A. Syed
SPCTS, Universite de Limoges, Faculte des Sciences, Limoges, France

A. Denoirjean
Science des Precedes Ceramique et de Traitement de Surface, University of Limoges, UMR CNRS 6638; France

P. Denoirjean
SPCTS, Universite de Limoges, Faculte des Sciences,123 ave. A. Thomas, 87060, Limoges, France

J. C. Labbe
Faculte des Sciences et Techniques, L.M.C.T.S. - C.N.R.S. E.S.A. 6015 Universite de Limoges -123, av. Albert Thomas - 87065 LIMOGES Cedex, France

Pierre Fauchais
Laboratoire Sciences des Precedes Ceramiques et de Traitements de Surface, UMR 6638 CNRS-Universite de Limoges, faculte des Sciences et Technique, conventionne avec le CEA n° M08, France

ABSTRACT

The phenomena influencing the properties of plasma sprayed ceramic-metal composite (cermet) deposits were examined. For that purpose, cermet deposits were developed by co-spraying alumina and austenitic stainless steel powders and were compared with those fabricated by spraying these powders individually. A set of particle injection and plasma spray parameters were determined by optimizing deposition efficiency of sprayed powders. The properties of the fabricated composite deposits were only partially dependent on the inherent properties of the parent materials and other factors had more dominating influence. Beside other factors, in-flight metallic particle oxidation and ceramic-metal wetting behavior were found to be the major phenomena controlling deposit properties. The in-flight particle oxidation, contributing up to 43% of the total oxide in metallic deposits, resulted in higher hardness and elastic modulus values of stainless steel deposits. The formed oxide could assist in improving the wetting behavior of stainless steel-alumina system, studied by sessile drop method. In non-wetting conditions, extensively fragmented stainless steel splats were collected on predeposited alumina causing poor interlamellar contacts and inferior deposit integrity and mechanical properties.