DEGRADATION MECHANISM STUDY OF SELECTED THERMALLY SPRAYED COATINGS IN THE ENVIRONMENT OF STEAM TURBINE

1 HOUDKOVÁ Šárka
Co-authors:
1 PRANTNEROVÁ Michaela 2 BYSTRIANSKÝ Martin 3 LUKÁČ František
Institutions:
1 Research and Testing Institute Plzeň, Plzeň, Czech Republic, EU, houdkova@vzuplzen.cz, prantnerova@vzuplzen.cz
2 RTI-University of West Bohemia, Plzeň, Czech Republic, EU, mbyst@rti.zcu.cz
3 Institute of Plasma Physics ASCR, Prague, Czech Republic, EU, lukac@ipp.cas.cz
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
909-915
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
31 views / 8 downloads
Abstract

In the paper, the influence of high temperature and hot pressure steam on the microstructure and phase composition of HVOF sprayed wear resistant Cr3C2-NiCr coating and flame sprayed NiCrAl-Bentonite abradable coating is studied. Both the results of laboratory oxidation tests and the long-term exposition tests in the steam turbine are presented. The mechanism of selective carbide oxidation was observed in both laboratory test and long-term oxidation test in the case of HVOF Cr3C2-NiCr coating. The oxidation of NiCrAl matrix of flame spray abradable coating is described. Both coatings suffered from oxidation, but their integrality was not disrupted even after 5,5 years of exposition in steam turbine environment.

Keywords: Steam turbine, degradation, thermal spray, abradable, Cr3C2-NiCr, NiCrAl-Bentonite
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