CHARACTERIZATION OF FLAME SPRAYED ABRADABLE SEAL NICRAL-BENTONITE COATINGS

1 HOUDKOVÁ Šárka
Co-authors:
2 SCHUBERT Jan 3 ČESÁNEK Zdeněk 4 LUKÁČ František 5 BYSTRIANSKÝ Martin
Institutions:
1 Research and Testing Institute in Plzeň, Plzeň, Czech Republic, EU, houdkova@vzuplzen.cz
2 Research and Testing Institute in Plzeň, Plzeň, Czech Republic, EU, schubert@vzuplzen.cz
3 Research and Testing Institute in Plzeň, Plzeň, Czech Republic, EU, cesanek@vzuplzen.cz
4 Institute of Plasma Physics ASCR, Prague, Czech Republic, EU, lukac@ipp.cas.cz
5 RTI-University of West Bohemia, Plzeň, Czech Republic, EU, mbyst@rti.zcu.cz
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
979-984
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
35 views / 8 downloads
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: NiCrAl-Bentonite, abradable seal, flame spray, abradability
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