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Hydrogen permeation properties of CrxCy@Cr2O3/Al2O3 composite coating derived from selective oxidation of a CrC alloy and atomic layer deposition
Authors:Jipeng Wang  Zhaoxia Lu  Yunhan Ling  Rongguang Wang  Yunhui Li  Qingyun Zhou  Zhengjun Zhang
Affiliation:1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;2. Lab of Advanced Materials, School of Materials Sciences and Engineering, Tsinghua University, Beijing 100084, China;3. Department of Mechanical Systems Engineering, Faculty of Engineering, Hiroshima Institute of Technology, 2-1-1 Miyake, Saeki-ku, Hiroshima 731-5193, Japan
Abstract:Metal oxides and carbides are promising tritium permeation barrier coatings for fusion reactors. However, the thermomechanical mismatch between the coating and substrate poses a threat to their interface's integrity during fabrication and operation. To address this issue, a metallic interlayer coating was introduced followed by selective oxidation in which a compact and uniform Cr/>C amorphous alloy coating was successfully deposited on the stainless steel substrate by pulsed electrochemical deposition. A new composite coating of Cr<sub>x</sub>C<sub>y</sub>@Cr<sub>2</sub>O<sub>3</sub>/Al<sub>2</sub>O<sub>3</sub> was formed by subsequent controlled oxidation conversion and atomic layer deposition. The phase, morphology, chemical state and defects of the films were analyzed and compared both before and after hydrogen exposure at 300 °C. The results show that this new kind of composite coating, based on the principles of grain boundary pinning of chromic oxide with carbide and defect healing of alumina, can remarkably improve the hydrogen permeation barrier performance of these materials.</td>
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Keywords:Pulse electrodeposition  Atomic layer deposition  Hydrogen permeation
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