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High Temperature Steam Oxidation Behavior of Cr-coated Zr Fabricated by Filtered Cathodic Vacuum Arc Ion Deposition
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Affiliation:

1.Key Laboratory of Beam Technology of Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University;2.Beijing Radiation Center

Clc Number:

TG174.442

Fund Project:

Nuclear Materials Innovation Foundation (ICNM-2020-YZ-04), Beijing Natural Science Foundation (2172029) and National Natural Science Foundation of China (51671032)

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    Abstract:

    A Cr coating of about 4 μm thick was successfully prepared on pure zirconium by filtered cathodic vacuum arc ion deposition technology (FCVAD), and the high-temperature oxidation properties of bare and Cr-coated Zr were measured using a thermogravimetric analyzer (TGA) in steam environment at different temperatures. Their phase composition, microstructure and composition distributions before and after the steam oxidation tests were characterized by X-ray diffraction analyzer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). It was found that the mass gain per unit area of Cr-coated Zr was only 1/4, 1/6 and 4/9 of that of bare Zr after 3600 s exposure in 900, 1000 and 1100℃ steam environment, respectively. In the initial stage of steam oxidation, a compact and uniform Cr2O3layer was formed on the surface of Cr layer, significantly reducing oxygen or steam diffusion inwards. After Cr coating was completely oxidized into Cr2O3, Zr substrate was gradually oxidized, but the Cr2O3 at Cr2O3/Zr interface was reduced to form Cr. In addition, the oxidation activation energy of the Cr-coated Zr was up to 293.17 kJ/mol.

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[Wang Xingping, Wei Kejian, Liao Bin, Guan Haohao, Chen Lin, Du Jiancheng, Xu Chi, Xue Wenbin. High Temperature Steam Oxidation Behavior of Cr-coated Zr Fabricated by Filtered Cathodic Vacuum Arc Ion Deposition[J]. Rare Metal Materials and Engineering,2021,50(5):1665~1672.]
DOI:10.12442/j. issn.1002-185X.20200372

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History
  • Received:May 30,2020
  • Revised:June 25,2020
  • Adopted:July 01,2020
  • Online: June 09,2021
  • Published: May 25,2021