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ELECTRON BEAM REMELTING OF PLASMA SPRAYED ALUMINA COATINGS
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SYSNO ASEP 0467885 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název ELECTRON BEAM REMELTING OF PLASMA SPRAYED ALUMINA COATINGS Tvůrce(i) Matějíček, Jiří (UFP-V) RID, ORCID
Veverka, J. (CZ)
Čížek, J. (CZ)
Kouřil, J. (CZ)Zdroj.dok. METAL 2016 – Conference proceedings: 25th Anniversary International Conference on Metallurgy and Materials. - Ostrava : TANGER Ltd., Ostrava, 2016 - ISBN 978-80-87294-67-3 Rozsah stran s. 921-927 Poč.str. 6 s. Forma vydání Nosič - C Akce METAL 2016 - 25th Anniversary International Conference on Metallurgy and Materials/25./ Datum konání 25.05.2016 - 27.05.2016 Místo konání Brno Země CZ - Česká republika Typ akce WRD Jazyk dok. eng - angličtina Země vyd. CZ - Česká republika Klíč. slova Plasma sprayed coating ; alumina ; electron beam ; remelting ; post-treatment Vědní obor RIV JK - Koroze a povrchové úpravy materiálů CEP GA14-12837S GA ČR - Grantová agentura ČR Institucionální podpora UFP-V - RVO:61389021 UT WOS 000391251200149 EID SCOPUS 85010754939 Anotace 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.
Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2017
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