Original title: Characterization of flame sprayed abradable seal NiCrAl-bentonite coatings
Authors: Houdková, Š. ; Česánek, Z. ; Schubert, J. ; Lukáč, František ; Bystrianský, M.
Document type: Papers
Conference/Event: 27th International Conference on Metallurgy and Materials, Brno (CZ), 20180523
Year: 2018
Language: eng
Abstract: The NiCrAl-21% Bentonite abradable coating, deposited by flame spraying, was exposed to 720°C / 1 hour air-annealing to evaluate its resistance against heat-induced changes. The SEM and XRD microstructure evaluation was done. After the air-annealing, the increase of HR15Y surface hardness was recorded and accompanied with decrease of abradability evaluated by Progressive Readability Hardness (PAH) test, although no demonstrable microstructural changes was recorded by SEM. XRD analyses evidenced the formation of nickel oxides and ordered Ni3Al phase during the air-annealing. Besides the abradable coating evaluation, this work brings the verification of the potential of PAH for scratch hardness testing. The measurement provides the results with low scatter, compared to usual surface hardness testing, and enables to distinguish between the depth of indentation in loaded and unloaded state, pointing out to the elastic/plastic deformation ratio.
Keywords: Abradability; Abradable seal; Flame spray; NiCrAl-Bentonite
Host item entry: 27th International Conference on Metallurgy and Materials, ISBN 978-80-87294-84-0

Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0299447

Permalink: http://www.nusl.cz/ntk/nusl-403643


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