Characterization of Iron-Chromium-Aluminum surface coated Zircaloy-2 under high temperature steam
Zhong, Weicheng
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https://hdl.handle.net/2142/90654
Description
Title
Characterization of Iron-Chromium-Aluminum surface coated Zircaloy-2 under high temperature steam
Author(s)
Zhong, Weicheng
Issue Date
2016-04-29
Director of Research (if dissertation) or Advisor (if thesis)
Heuser, Brent J.
Department of Study
Nuclear, Plasma, & Rad Engr
Discipline
Nuclear, Plasma, Radiolgc Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Cladding
FeCrAl
Zircaloy
coating
oxidation
Abstract
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.
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