Deposition, characterization and high-temperature steam oxidation behavior of single-phase Ti2AlC-coated Zircaloy-4

• DOI: 10.1016/j.corsci.2018.02.035
• Publication Date: 2018-02-20T07:23:29Z
• Authors: Chongchong Tang; Martin Steinbrueck; Michael Stueber; Mirco Grosse; Xiaojuan Yu; Sven Ulrich; Hans Juergen Seifert
• Keywords: ddc:620; High temperature corrosion; Porous TiO2 layer; Alumina; Sputtered films; 02 engineering and technology; Titanium carbide; 2017-018-018049 2017-018-018050 TFC TFT; Coatings; Nanoscale multilayers; Oxidation; Diffusion coatings; Engineering & allied operations; Zirconium alloys; Rapid diffusion; High temperature; 620; Protection effect; Steam oxidation behavior; Titanium dioxide; Aluminum coatings; Duplex scale; 0210 nano-technology; Diffusion barriers; info:eu-repo/classification/ddc/620

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.