Volume 7, 2020
Special Issue - The emerging materials and processing technologies
|Number of page(s)||5|
|Published online||23 September 2020|
Microstructural aspects of the protective ceramic coatings applied on the surfaces of refractory alloys produced by additive manufacturing
National Research and Development Institute for Non-Ferrous and Rare Metals −IMNR, 102 Biruintei Blvd.,
Pantelimon, jud Ilfov, 077145, Romania
2 National Research and Development Institute for Gas Turbines − COMOTI, 220 D Iuliu Maniu Bd., 061126 Bucharest 6, Romania
* e-mail: email@example.com
Accepted: 4 September 2020
The possibility of depositing multi layers made of metals/alloys and high temperature ceramics by electron beam physical evaporation process under high vacuum (EB-PVD) on the surface of a parallelepiped sample made by selective laser melting (SLM) from a Ni base refractory super alloy was experimentally tested. The SEM-EDAX micro structural analysis revealed the morphology and thickness of the coatings consisting of a NiCrAlY base alloy as bonding layer and three successive YSZ, LZO and GZO ceramic layers on the Ni-based super alloy substrate obtained by additive manufacturing. The adhesion of the layer deposited was evaluated by the scratch test method. The analysis highlighted the importance of pre-preparing the surface of the additive manufactured substrates, in order to control the adhesion and uniformity of the deposited layers.
Key words: Ni-base superalloys / ceramic coatings / SLM / EB-PVD / scratch test
© A. Sobetkii et al., Published by EDP Sciences 2020
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