Characterization of ZrO2 ceramic coatings on ZrH1.8 prepared in different electrolytes by micro-arc oxidation

Wang, Zhi-Gang; Chen, Weidong; Yan, Shuai; Fan, Xinggang; Zhang, Xu

doi:10.1007/s12598-015-0503-8

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…The film formed by zirconium hydride in the atmosphere of CO 2 + P had a better hydrogen resistance effect. In the follow‐up study, some scholars 20,21 studied the hydrogen resistance mechanism of the film prepared by CO 2 in‐situ oxidation method: it was proposed that the tetragonal zirconia played the role of hydrogen resistance in the oxide layer, because it was continuous and compact, and because the OH bond formed between the O and H of the film, it could also prevent the escape of hydrogen.…”

Section: Main Problems Of Moderator Materialsmentioning

confidence: 99%

Advance in and prospect of moderator materials for space nuclear reactors

et al. 2021

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Summary Since 1960s, many countries led by the United States and Russia have done a lot of research on space nuclear reactor power. Moderator is an important functional component in a nuclear reactor operating with a thermal neutron spectrum. This paper reviews the moderation principle, main existing problems, research status as well as main challenges ahead and possible solutions of moderator materials in space nuclear reactor. Aiming at the problems of hydrogen cracking, the low utilization rate of nuclear fuel and hydrogen loss of moderator materials, the assumption of using high entropy alloy hydride as a moderator material is put forward. Moreover, this paper also points out the metal elements suitable for nuclear reactor, while discussing the advantages and disadvantages of several typical elements, hoping to provide a reference for the selection and fabrication of moderator materials. Highlights Sketch the moderating mechanism and the moderator selection principle. Summarize the problems and solutions in the preparation of metal hydride. Summarize the application status of zirconium hydride and yttrium hydride moderator materials. Predict the future development trend and feasible methods of moderator materials.

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Section: Main Problems Of Moderator Materialsmentioning

confidence: 99%

Advance in and prospect of moderator materials for space nuclear reactors

et al. 2021

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“…Certainly, the selection of an oxide material with a coefficient of thermal expansion similar to that of the matrix is an important means of improving the hydrogen barrier properties of the coating. In recent years, zirconia (ZrO 2 ) has been widely studied as a new type of hydrogen permeation barrier coating material with a coefficient of thermal expansion much closer to those of various types of steel materials [ 24 , 25 ], and the diffusion coefficient of hydrogen in zirconia is low [ 26 , 27 , 28 ]. Hatano et al [ 29 ] prepared ZrO 2 coatings on ferrite steel by the sol-gel method and electrolytic deposition technique, and the coatings showed a good hydrogen barrier effect at 300–550 °C according to the gas phase hydrogen permeation test.…”

Section: Introductionmentioning

confidence: 99%

“…For example, He et al [21] prepared a Cr 2 O 3 coating on 316L stainless steel by the metal-organic decomposition (MOD) method, using chromium acetylacetonate as the precursor. The hydrogen permeation results show that the hydrogen permeability of Cr 2 O 3 coating can be reduced by 24-117 times at 823-973 K. Feng et al [22] deposited Al 2 O 3 as a hydrogen barrier coating on a 316L matrix by plasma electrolytic oxidation, and the results of gas-phase hydrogen permeation tests showed that the alumina coating was able to reduce the rate of hydrogen permeation by three orders of magnitude concerning the pure matrix. However, the thermal expansion coefficient between the metal matrix and the oxide coating differs greatly, and there is an obvious thermal mismatch problem, which is highly likely to lead to problems such as cracks and coating peeling.…”

Section: Introductionmentioning

confidence: 99%

Yttria-Stabilized Zirconia Composite Coating as Barrier to Reduce Hydrogen Permeation into Steel

Wu,

Xie,

et al. 2024

Materials

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Hydrogen atoms can enter into metallic materials through penetration and diffusion, leading to the degradation of the mechanical properties of the materials, and the application of hydrogen barrier coatings is an effective means to alleviate this problem. Zirconia coatings (ZrO2) have been widely studied as a common hydrogen barrier coating, but zirconia undergoes a crystalline transition with temperature change, which can lead to volumetric changes in the coating and thus cause problems such as cracking and peeling of the coating. In this work, ZrO2 coating was prepared on a Q235 matrix using a sol-gel method, while yttria-stabilized zirconia (YSZ) coatings with different contents of rare earth elements were prepared in order to alleviate a series of problems caused by the crystal form transformation of ZrO2. The coating performances were evaluated by the electrochemical hydrogen penetration test, pencil hardness test, scratch test, and high-temperature oxidation test. The results show that yttrium can improve the stability of the high-temperature phase of ZrO2, alleviating the cracking problem of the coating due to the volume change triggered by the crystalline transition; improve the consistency of the coating; and refine the grain size of the oxide. The performance of YSZ coating was strongly influenced by the yttria doping mass, and the coating with 10 wt% yttria doping had the best hydrogen barrier performance, the best antioxidant performance, and the largest adhesion. Compared with the matrix, the steady-state hydrogen current density of the YSZ coating decreased by 72.3%, the antioxidant performance was improved by 65.8%, and the ZrO2 coating hardness and adhesion levels were B and 4B, respectively, while YSZ coating hardness and adhesion were upgraded to 2H and 5B. With the further increase in yttrium doping mass, the hardness of the coating continued to improve, but the defects of the coating increased, resulting in a decrease in the hydrogen barrier performance, antioxidant performance, and adhesion. In this work, the various performances of ZrO2 coating were significantly improved by doping with the rare earth element, which provides a reference for further development and application of oxide coatings.

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“…Micro-arc oxidation (MAO) is a technology that uses an in situ growth of ceramic coating directly on Al, Mg, Ti, and Zr surfaces. The oxide coating obtained by MAO is bonded to the metal closely, and the coating has good wear resistance, corrosion resistance, and electrical insulation properties [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Graphene on the Wear and Corrosion Resistance of Micro-Arc Oxidation Coating on a Titanium Alloy

Zhang

Lű

et al. 2021

Metals

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In order to improve the wear and corrosion resistance of micro-arc oxidation (MAO) coating on a Ti-5Al-1V-1Sn-1Zr-0.8Mo alloy, 0–0.20 g/L graphene was added to the electrolyte to prepare micro-arc oxidation coating. The thickness, roughness, micro-morphology, and composition of the MAO coating were characterized, and the wear and corrosion resistance of the coating was tested and analyzed. The results show that with 0.05 g/L of graphene in the electrolyte, the roughness of the coating decreased from 56.76 μm to 31.81 μm. With the increase in the addition of graphene, the microstructure of the coating became more compact, the diameter of micro-holes and micro-cracks decreased, and the corrosion resistance of the coating improved. The wear tests showed that the mass loss of the coating at the early wear stage (0~100 revolutions) was greater than that at the later stage (100~250 revolutions), and the wear resistance of the coating obtained by the addition of 0.10 g/L of graphene was the highest. With 0.10 g/L of graphene, the adhesion force between the coating and the substrate alloy is the largest, reaching 57.1 N, which is 9.98 N higher than that without graphene. After salt spray corrosion for 480 h, the coating with graphene has better corrosion resistance than that of a graphene-free coating.

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Characterization of ZrO2 ceramic coatings on ZrH1.8 prepared in different electrolytes by micro-arc oxidation

Cited by 9 publications

References 33 publications

Advance in and prospect of moderator materials for space nuclear reactors

Advance in and prospect of moderator materials for space nuclear reactors

Yttria-Stabilized Zirconia Composite Coating as Barrier to Reduce Hydrogen Permeation into Steel

Effects of Graphene on the Wear and Corrosion Resistance of Micro-Arc Oxidation Coating on a Titanium Alloy

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