Microstructure evolution and oxidation behavior of bi-layer CrAl-Mo coated Zircaloy-4 in steam at 1200 °C and 1300 °C
Source abstract
Abstract
CrAl alloys have shown excellent oxidation resistance in high temperature steam environment and enhanced wear resistance. However, thin film CrAl on zircaloy substrate can only tolerate up to 1200 °C steam because of the fast diffusion between zirconium and the coating. In this study, Mo was introduced as a buffer layer which significantly reduced the diffusion rate. The bi-layer CrAl-Mo coated Zircaloy-4 alloy was prepared by magnetron sputtering method without further treatment. CrAl-Mo coatings with three different compositions (Cr/Al atomic ratios of 96/04, 84/16 and 68/32) were prepared to investigate the role of Al in the high temperature oxidation of the CrAl system. The bi-layer CrAl-Mo coatings show excellent performance up to 1300 °C. Dense and protective α-Al 2O 3 layers are formed on the surface or underneath the chromia (Cr 2O 3 ) layer, which is dominated by the aluminum concentrations. A systematic investigation of the oxidation behavior of CrAl coatings with representative Al contents at 1200 °C and 1300 °C is presented in this paper.
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Research context
OpenAlex topics: Nuclear Materials and Properties · Fusion materials and technologies · High-Temperature Coating Behaviors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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