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Deposition, characterization and high-temperature steam oxidation behavior of single-phase Ti 2 AlC-coated Zircaloy-4

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

Abstract (englisch):
Oxidation of single-phase and dense Ti2AlC coatings with or without a 500 nm TiC diffusion barrier deposited on Zircaloy-4 by annealing of nanoscale multilayer stacks between 800 °C and 1200 °C in high-temperature steam was investigated. Coatings without TiC barrier formed a duplex scale: outer θ-Al2O3 rich layer mixed with TiO2 and inner porous TiO2 layer; correspondingly, a triple-layered scale (θ-Al2O3 + TiO2/θ-Al2O3/TiO2) grew on coatings with barrier at 800 °C. The TiC barrier suppresses the rapid diffusion of Al into the substrate, contributing to improved performance and longer life of Ti2AlC/TiC coatings. However, both coatings demonstrated low protection effect from 1000 °C in steam.

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 0010-938X
KITopen ID: 1000083046
HGF-Programm 32.02.11; LK 01
Erschienen in Corrosion science
Band 135
Seiten 87-98
Schlagworte Alumina; Aluminum coatings; Coatings; Diffusion barriers; Diffusion coatings; Oxidation; Titanium carbide; Titanium dioxide; Zirconium alloys, Duplex scale; High temperature; Nanoscale multilayers; Porous TiO2 layer; Protection effect; Rapid diffusion; Sputtered films; Steam oxidation behavior, High temperature corrosion
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