Direct Fabrication and Characterization of Zirconia Thick Coatings on Zirconium Hydride as a Hydrogen Permeation Barrier
Source abstract
Abstract
The present work attempted to produce thick zirconia coatings formed by micro-arc oxidation as a hydrogen permeation barrier on zirconium hydride alloy. A novel multiphase zirconia coating was achieved, exhibiting superior hydrogen permeation barrier performance. The growth dynamics, formation mechanism, and phase evolution behavior of thick zirconia coatings were explored, and the hydrogen permeation barrier performance was evaluated by means of vacuum dehydrogenation experiment. The hydrogen desorption quantity was monitored by analyzing pressure changes with a quadruple mass spectrometer (QMS). Experimental results show that the multiphase coatings were composed of monoclinic ZrO2 (m-ZrO2), tetragonal ZrO2 (t-ZrO2), and a trace of cubic ZrO2 (c-ZrO2). The coatings were generally divided into a dense and uniform inner, intermediate layer, and a porous top layer. The quantitative analysis indicates an increased amount of m-ZrO2 toward the coating surface and an increased amount of t-ZrO2 toward the oxide/metal interface. This novel multiphase thick zirconia coating can noticeably improve hydrogen permeation resistance, and the permeation reduction factor (PRF) value is improved by nearly 13 times compared with bare zirconium hydride. It is demonstrated that hydrogen desorption is retarded to some extent in the presence of thick zirconia coating. Hydrogen desorption of the sample with ceramic coating started at 660 °C, which was apparently higher than that of the sample without coating.
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Research context
OpenAlex topics: Nuclear Materials and Properties · Advancements in Solid Oxide Fuel Cells · Catalytic Processes in Materials Science
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials and Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010, China
School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
Inner Mongolia Key Laboratory of Thin Film and Coatings, Hohhot 010051, China
Department of Automation, Baotou Light Industry Vocational Technical College, Baotou 014030, China
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Funding
National Natural Science Foundation of China · Natural Science Foundation of Inner Mongolia · Inner Mongolia Science & Technology Project Plan · Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region
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