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ELECTRON BEAM REMELTING OF PLASMA SPRAYED ALUMINA COATINGS
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SYSNO ASEP 0467885 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title ELECTRON BEAM REMELTING OF PLASMA SPRAYED ALUMINA COATINGS Author(s) Matějíček, Jiří (UFP-V) RID, ORCID
Veverka, J. (CZ)
Čížek, J. (CZ)
Kouřil, J. (CZ)Source Title METAL 2016 – Conference proceedings: 25th Anniversary International Conference on Metallurgy and Materials. - Ostrava : TANGER Ltd., Ostrava, 2016 - ISBN 978-80-87294-67-3 Pages s. 921-927 Number of pages 6 s. Publication form Medium - C Action METAL 2016 - 25th Anniversary International Conference on Metallurgy and Materials/25./ Event date 25.05.2016 - 27.05.2016 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords Plasma sprayed coating ; alumina ; electron beam ; remelting ; post-treatment Subject RIV JK - Corrosion ; Surface Treatment of Materials R&D Projects GA14-12837S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000391251200149 EID SCOPUS 85010754939 Annotation Plasma sprayed alumina coatings find numerous applications in various fields, where they enhance the properties of the base material. Examples include thermal barriers, wear resistance, electrical insulation, and diffusion and corrosion barriers. A typical structure of plasma sprayed coatings, containing a multitude of voids and imperfectly bonded interfaces, gives them unique properties - particularly low thermal conductivity, high strain tolerance, etc. However, for certain applications such as permeation barriers or wear resistance, these voids may be detrimental.
This paper reports on the first experiments with remelting of plasma sprayed alumina coatings by electron beam technology, with the purpose of densifying the coatings and thereby eliminating the voids. Throughout the study, several parameters of the e-beam device were varied - beam current, traverse velocity and number of passes. The treated coatings were observed by light and electron microscopy and the thickness, structure and surface morphology of the remelted layer were determined and correlated with the process parameters. Based on the first series of experiments, the e-beam settings leading to dense and smooth remelted layer of sufficient thickness were obtained. In this layer, a change of phase composition and a marked increase in hardness were observed.
Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
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