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Properties of plasma sprayed alumina-chromia mixtures
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SYSNO ASEP 0025673 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Properties of plasma sprayed alumina-chromia mixtures Title Vlastnosti plazmově stříkaných směsí oxidů hliníku a chromu Author(s) Dubský, Jiří (UFP-V) RID
Řidký, V. (CZ)
Chráska, Pavel (UFP-V) RID
Kolman, Blahoslav Jan (UFP-V)Source Title International Thermal Spray Conference & Exposition, ITSC 2004. - Dusseldorf : DVS-Dusseldorf, Germany, 2004 - ISBN 3-87155-792-7 Pages 030.pdf Number of pages 8 KB Publication form CD-ROM - CD-ROM Action International Thermal Spray Conference 2004, Thermal Spray Solutions, Advances in Technology and Applications Event date 10.05.2004-12.05.2004 VEvent location Osaka Country JP - Japan Event type WRD Language eng - English Country DE - Germany Keywords Plasma spraying ; coating ; alumina ; chromia ; structure Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GA106/01/0958 GA ČR - Czech Science Foundation (CSF) Annotation One of the very important factors, often neglected, determining the final properties of a plasma sprayed deposit is its phase composition. It is well known that spraying of Alumina results usually in formation of other phases than the desired hard α-phase (corundum) unless stabilizing admixture is added into the feedstock. In this work Chromia was used for stabilization and feedstock powders with 0, 8 and 33 wt % of Chromia, and unalloyed Chromia, were used to produced coatings by WSP®. Two types of feedstocks were used: fused/crushed and a mixture of Alumina and Chromia powders. The effect of the Chromia content on phase composition, residual stresses, hardness and wear abrasion of coatings was studied. It has been proved by the microanalysis that a certain amount of Cr is transferred into Alumina particles during the "in-flight" reaction of both powders in the plasma jet. Complex "alloy" oxides form where part of Al is replaced by Cr and the α-phase is partially stabilized. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2006
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