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Zr alloy protection against high-temperature oxidation: Coating by a double-layered structure with active and passive functional properties

Kratochvílová, I.; Ashcheulov, P.; Škarohlíd, J.; Škoda, R.; Kopeček, J.; Sajdl, P.; Macák, J.; Lajčinová, M.; Nováková, A.; Neethling, J.; Vuuren, A. J. van; Ngongo, S.; Xu, P.; Lorinčík, J.; Steinbrück, M. ORCID iD icon 1
1 Institut für Angewandte Materialien (IAM), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):
In this work, a new concept of metal surface protection against degradation caused by high-temperature oxidation in water environment is presented. We were the first to create a double-layered coating consisting of an active and passive part to protect Zr alloy surface against high-temperature oxidation in a hot water environment. We investigated the hot steam corrosion of ZIRLO fuel cladding coated with a double layer consisting of 500 nm nanocrystalline diamond (NCD) as the bottom layer and 2 m chromium-aluminum-silicon nitride (CrAlSiN) as the upper layer. Coated and noncoated ZIRLO samples were exposed for 4 days at 400 °C in an autoclave (working water-cooled nuclear reactor temperature) and for 60 minutes at 1000 °C (nuclear reactor accident temperature) in a hot steam furnace. We have shown that the NCD coating protects the Zr alloy surface against oxidation in an active way: carbon from NCD layer enters the Zr alloy surface and, by changing the physical and chemical properties of the Zr cladding tube surface, limits the Zr oxidation process. In contrast, the passive CrAlSiN coating prevents the Zr cladding tube surface from coming into physical contact with the hot steam. ... mehr

DOI: 10.1016/j.corsci.2019.108270
Zitationen: 11
Web of Science
Zitationen: 10
Zitationen: 11
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 0010-938X, 1879-0496
KITopen-ID: 1000104808
HGF-Programm 34.13.01 (POF III, LK 01) Material f.therm.,mechan.u.Umweltbelast.
Weitere HGF-Programme 32.02.11 (POF III, LK 01) Auslegungsüberschreitende Störfälle
Erschienen in Corrosion science
Verlag Elsevier
Band 163
Seiten Article: 108270
Nachgewiesen in Dimensions
Web of Science
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