Characterization of Iron-Chromium-Aluminum surface coated Zircaloy-2 under high temperature steam

Cladding;FeCrAl;Zircaloy;coating;oxidation

Zhong, Weicheng ; Heuser ; Brent J.

关键词: Cladding;    FeCrAl;    Zircaloy;    coating;    oxidation;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/90654/ZHONG-THESIS-2016.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Iron-Chromium-Aluminum (FeCrAl) thin films have been deposited on Zircaloy-2 (Zry2) and yttria-stabilized zirconia (YSZ) by magnetron sputtering, and they have been tested with respect to the oxidation weight gain in high temperature steam. In 700C steam environment, the FeCrAl-coated Zry2 samples have significantly reduced the oxidation rate, compared to the uncoated Zry2. Alumina was promoted for FeCrAl with high Al composition, and a parabolic alumina growth rate under 700_C steam exposure was quantified by AES depth profile. Zirconia formation was inhibited by the FeCrAl coating. A thicker film proved to be more protective, and delayed zirconia formation for a longer time. In 1100C steam environment, a complete film loss was observed due to the low eutectic temperature (950C) of the Fe-Zr binary system.