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Evaluation of Magnetron sputtered protective ZR-C-AL coatings for accident tolerant zircaloy claddings

Tang, Chongchong; Steinbrueck, Martin; Grosse, Mirco; Ulrich, Sven; Stueber, Michael; Seifert, Hans Juergen

Abstract (englisch):
Coatings in the Zr-C-Al system, with a focus of the potential formation of Zr2AlC and Zr3AlC2 MAX phases, were deposited on Zircaloy-4 cladding substrates aiming to provide protection against high-temperature steam oxidation during accidental scenarios. A nanoscale elemental multilayer architecture with a multiple stacking sequence of zirconium, -carbon, and -aluminum layers corresponding to the stoichiometries of Zr2AlC and Zr3AlC2 were obtained. However, no MAX phases, but Zr(Al)C carbide, formed after annealing in argon at temperatures from 600°C to 1200°C. Coatings with three different Zr/Al ratios, corresponding to stoichiometries of 2Zr/C/Al, 3Zr/5C/3Al, 2Zr/5C/4Al, were deposited on polished Zircaloy-4 substrates. During oxidation at 700°C for 250 min in steam, all three coatings revealed lower oxidation rates compared to the uncoated Zircaloy-4. In particular, the two coatings with higher Al content (i.e., 3Zr/5C/3Al and 2Zr/5C/4Al) displayed better oxidation resistance. However, these two coatings demonstrated lower adhesion to the Zircaloy-4 substrates; widespread cracks and spallation of these two coatings were observed a ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Proceedingsbeitrag
Jahr 2017
Sprache Englisch
Identifikator KITopen ID: 1000083043
HGF-Programm 32.02.11; LK 01
Erschienen in Water Reactor Fuel Performance Meeting (WRFPM), September 10-14, 2017, Jeju Island, Korea
Seiten 1-9
Bemerkung zur Veröffentlichung Proceedings auf USB Medium
Schlagworte Zr-C-Al coatings; MAX phase; Zircaloy cladding; ATF; high-temperature oxidation
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