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王兴平,魏克俭,廖斌,关浩浩,陈琳,杜建成,徐驰,薛文斌.锆表面磁过滤阴极真空弧离子镀Cr涂层高温蒸汽氧化行为研究[J].稀有金属材料与工程(英文),2021,50(5):1665~1672.[Wang Xingping,Wei Kejian,Liao Bin,Guan Haohao,Chen Lin,Du Jiancheng,Xu Chi and 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.]
High Temperature Steam Oxidation Behavior of Cr-coated Zr Fabricated by Filtered Cathodic Vacuum Arc Ion Deposition
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Received:May 30, 2020  
DOI:
Key words: Pure zirconium  Filtered cathodic vacuum arc ion deposition  Cr coating  High-temperature steam oxidation  Oxidation kinetics
Foundation item:核材料创新基金(ICNM-2020-YZ-04),北京市自然科学基金(2172029)和国家自然科学(51671032)
Author NameAffiliation
Wang Xingping,Wei Kejian,Liao Bin,Guan Haohao,Chen Lin,Du Jiancheng,Xu Chi and Xue Wenbin  
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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.