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The Effect of Annealing Temperature on the Microstructure and Properties of Cr–C–Al Coatings on Zircaloy-4 for Accident-Tolerant Fuel (ATF) Applications

Tang, Chongchong; Steinbrück, Martin ORCID iD icon; Grosse, Mirco; Ulrich, Sven; Stüber, Michael

Abstract:

Elemental Cr/C/Al multilayers (stoichiometric ratio: 2:1:1) with and without a Cr overlayer have been synthesized on Zircaloy-4 substrates by magnetron sputtering. The effects of annealing temperatures (400 and 550 °C) on phase/microstructure formation, mechanical properties, and oxidation/corrosion performance have been comparatively studied. Annealing of the multilayers at 400 °C led to the formation of nanocrystalline composite consisting of intermetallic and binary carbide phases. Single-phase Cr$_{2}$AlC was obtained after 550 °C annealing, but with microcracking of the coatings. Both annealed coatings displayed similar mechanical properties, high-temperature oxidation, and hydrothermal corrosion mechanisms. The composite coatings annealed at 400 °C significantly enhance the high-temperature oxidation resistance (α-Al$_{2}$O$_{3}$ scale growth) and hydrothermal corrosion (Cr$_{2}$O$_{3}$ passivation layer formation) of a Zircaloy-4 substrate without coating microcracking and delamination. Nanocomposite CrCAl-based coatings are promising candidates for coated ATF applications with acceptable processing temperatures and excellent oxidation/corrosion resistances for a zirconium alloy substrate.


Verlagsausgabe §
DOI: 10.5445/IR/1000142842
Veröffentlicht am 10.02.2022
Originalveröffentlichung
DOI: 10.3390/coatings12020167
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2079-6412
KITopen-ID: 1000142842
HGF-Programm 32.12.02 (POF IV, LK 01) Beyond Design Basis and Emergency Management
Erschienen in Coatings
Verlag MDPI
Band 12
Heft 2
Seiten Art.-Nr.: 167
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagwörter accident tolerant fuel (ATF); CrCAl coating; thermal annealing; mechanical properties; oxidation and corrosion
Nachgewiesen in Web of Science
Dimensions
Scopus
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