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Phase Formation Control in Plasma Sprayed Alumina–Chromia Coatings
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SYSNO ASEP 0367138 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Phase Formation Control in Plasma Sprayed Alumina–Chromia Coatings Author(s) Dubský, Jiří (UFP-V) RID
Chráska, Pavel (UFP-V) RID
Kolman, Blahoslav Jan (UFP-V)
Stahr, C.Ch. (DE)
Berger, L.-M. (DE)Source Title Ceramics - Silikáty. - : University of Chemistry and Technology Prague - ISSN 0862-5468
Roč. 55, č. 3 (2011), s. 294-300Number of pages 7 s. Publication form web - web Language eng - English Country CZ - Czech Republic Keywords Alumina ; Chromia ; Plasma spraying ; Phase stabilization Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass R&D Projects GA106/08/1240 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20430508 - UFP-V (2005-2011) UT WOS 000297615100015 Annotation Alumina is an inexpensive material often used as feedstock for plasma spraying. Hard corundum (α-Al2O3) is desirable in coatings, but other phases, unstable at elevated temperatures, also form as result of the complexity of the spraying processes. When chromia (Cr2O3) is added to Al2O3 a complex corundum type α-(Al,Cr)2O3 phase forms in the deposits. Two types of Al2O3/Cr2O3 powder feedstock with 2%, 8%, 33% and 50% Cr2O3 were sprayed: fused materials and mixtures of Al2O3 and Cr2O3 powders. Coatings were made by the water-stabilized plasma (WSP®) system and by commercial atmospheric plasma spraying (APS) and compared by various characterization techniques, including X-ray diffraction, scanning elektron microscopy and microanalysis. Coatings made from fused feedstock by both spraying methods contain the corundum phase with its fraction increasing with increasing Cr2O3 content. In case of mixed feedstock the stabilization effect was observed for WSP® spraying only. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2012
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