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Increasing α-phase content of alumina-chromia coatings deposited by suspension plasma spraying using hybrid and intermixed concepts
Institute of Plasma Physics CAS, v.v.i., Department of Materials Engineering, Za Slovankou 3, 182 00 Praha 8, Czech Republic; Czech Technical University in Prague, Faculty of Nuclear Science and Physical Engineering, Department of Materials, Trojanova 13, 120 00 Praha 2, Czech Republic .
Institute of Plasma Physics CAS, v.v.i., Department of Materials Engineering, Za Slovankou 3, 182 00 Praha 8, Czech Republic.
Institute of Plasma Physics CAS, v.v.i., Department of Materials Engineering, Za Slovankou 3, 182 00 Praha 8, Czech Republic.
Institute of Plasma Physics CAS, v.v.i., Department of Materials Engineering, Za Slovankou 3, 182 00 Praha 8, Czech Republic.
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2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 71, p. 298-311Article in journal (Refereed) Epub ahead of print
Abstract [en]

The novel method of hybrid suspension plasma spraying of dry coarse aluminum oxide powder with chromium oxide suspension using hybrid water/argon-stabilized (WSP-H 500) plasma torch was utilized for the deposition of coatings with very high α-phase content reaching up to 90%. The deposition mechanism and phase composition were compared with those of coatings deposited from i) intermixed alumina-chromia suspension and ii) alumina suspension doped with chromium nitrate nonahydrate solution. All deposition routes showed alternative ways of preparation of novel multimaterial coatings. It was demonstrated that the chromia addition and the deposition route play the crucial role in the pronounced formation of the thermodynamically stable α-phase. © 2019

Place, publisher, year, edition, pages
2019. Vol. 71, p. 298-311
Keywords [en]
Alumina; Aluminum oxide; Chromium compounds; Phase composition; Plasma jets; Plasma spraying; Powder coatings; Waterworks, Alumina suspensions; Aluminum oxide powders; Chromium oxides; Deposition mechanism; Hybrid suspension; Suspension plasma spraying; Thermodynamically stable; WSP-H, Aluminum coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-13876DOI: 10.1016/j.surfcoat.2019.04.091Scopus ID: 2-s2.0-85065121437OAI: oai:DiVA.org:hv-13876DiVA, id: diva2:1317844
Note

Funders: Technology Agency of the Czech Republic, TE02000011; Operational Programme Prague – Competitiveness, CZ.2.16/3.1.00/21566

Available from: 2019-05-24 Created: 2019-05-24 Last updated: 2019-07-26Bibliographically approved

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Joshi, Shrikant V.

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