|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accident Tolerant Fuels for Light Water Reactor
||Mitigation of Oxidation of Zircaloy Cladding in High Temperature Steam via Cr and CrAl Coatings
||Weicheng Zhong, Peter A Mouche, Brent J Heuser
|On-Site Speaker (Planned)
The oxidation response of Chromium/Chromium-Aluminum coatings on Zircaloy-2 in high temperature steam (HTS) environment was investigated. Coated Zircaloy-2 demonstrated up to three orders magnitude lower weight gain than uncoated Zircaloy in 700C HTS. Coatings with high Al composition developed γ-Al2O3 surface oxide, while coatings with high Cr composition developed chromia surface oxide and an underlying alumina layer. STEM/EDS and XRD demonstrated consistent post-HTS-exposure microstructure of coated Zircaloy-2 with regard to the intermetallic phases formation; this is attributed to the interaction of coatings and substrate. The intermetallic phases involve Fe and Ni. Estimates of Ni consumption indicate that SPP dissolution must occur during the HTS exposure. This is in an agreement with synchrotron X-ray diffraction, which shows a reduced volume fraction of SPPs after 700C HTS exposure. Characterization of oxidation performance of Cr/CrAl coatings in 1200C are on-going. This work is supported by the US DOE NEUP under contract number 12-4728.
||Planned: Supplemental Proceedings volume