Oxidation behavior and Cr-Zr diffusion of Cr coatings prepared by atmospheric plasma spraying on zircaloy-4 cladding in steam at 1300 °C

Li, Qing; Song, Peng; Zhang, Ruiqian; Li, Zhenhua; Wang, Yu; Du, Peinan; Lu, Jiansheng

doi:10.1016/j.corsci.2022.110378

Cited by 35 publications

(8 citation statements)

References 49 publications

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“…Для нанесения подобных покрытий применяются такие способы упрочнения, как наплавка, газопламенное напыление, гальванические покрытия, химико-термическая обработка и др. [13][14][15]. При этом наиболее простыми с технологической точки зрения, промышленно реализуемыми и масштабируемыми, экономически выгодными являются технологии химико-термической обработки.…”

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Diffusion coatings formation features, obtained by complex chemical-thermal treatment on the structural steels

Соколов¹,

Bobylyov²,

Popov³

2023

Metal Working and Material Science

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Introduction. The main methods of increasing the efficiency of products made from structural steels are considered. A description of diffusion saturation from liquid metal media solutions (DSLMMS) is given. Also, complex diffusion saturation technology (CDS), including DSLMMS and carburization is shown. The purpose of the work is to reveal the effect of steel composition on the process of formation and elemental composition of diffusion-saturated surface layers (coatings) based on chromium, as well as to establish differences and regularities in the processes of formation of diffusion-saturated coatings after DSLMMS and CDS. The methods of investigation. Cylindrical specimens 20 mm in diameter and 30 mm long were subjected to DSLMMS. The specimens were made of carbon and alloyed steels: St3, 20-Cr13, 40-Cr, 40-Cr13, 12-Cr18-Ni10-Ti. At the same time, some of the specimens were previously subjected to vacuum cementation. An eutectic Pb-Bi with the specified content of Cr was used as a transport medium when executing DSLMMS. Metallographic studies were carried out on microsection prepared according to the standard method. Studies to determine the thickness of coatings and its structure were carried out on the Dura Scan Falcon 500 Microhardness Tester. The elemental composition of the coatings was determined by the method of electron microprobe analysis on a Tescan Lyra 3 scanning electron microscope with the Oxford Ultim MAX PCMA system. Results and discussion. As a result of the research, it was revealed that the formation of saturated coatings occurs with DSLMMS and CDS. At the same time, the thickness of the coatings and its elemental composition depend on the steel grade and the technology used. After DSLMMS concentration of Cr varies from 96.9% to 91.1%. At the same time, the maximum concentration of 96.9% is observed on steel St3. After CDS, on the surfaces of all steel samples, the concentration of Cr decreases in comparison with the coatings obtained by the DSLMMS technology on steels: St3 from 96.9% to 66.8%; 40-Cr from 91.1% to 63.18%; 20-Cr13 from 93.18% to 62.54%; 12-Cr18-Ni10-Ti from 92.92% to 64.77%. The total thickness of diffusion-saturated coatings formed on all the alloys studied ranges from 17 to 17.5 µm.

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Section: *адрес для перепискиunclassified

Diffusion coatings formation features, obtained by complex chemical-thermal treatment on the structural steels

Соколов¹,

Bobylyov²,

Popov³

2023

Metal Working and Material Science

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“…Kashkarov et al [ 13 ] prepared a Cr coating on M5 Framatome (Zr1Nb) alloy by physical vapor deposition and found that a dense 4.5 μm thick Cr coating provided better oxidation resistance up to 1100 °C. Qing Li et al [ 14 , 15 ] prepared chromium coating on zircaloy-4 by atmospheric plasma spraying. Compared with zirconium alloy, after oxidation at 1300 °C, the multilayer structure of surface Cr 2 O 3 , residual Cr coating, thin (Zr, Cr) O 2 layer, Cr Zr layer and zirconium alloy substrate was formed.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Microstructures and High-Temperature Oxidation Resistance of Cr Coatings on Zircaloy-4 by Multi-Arc Ion Plating Technology

Peng

Liu

et al. 2022

Materials

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Introducing the oxidation-resistant coating on Zr alloy is considered to be one of the potential solutions for accident-tolerant fuel (ATF) materials. In this study, pure Cr coatings were prepared on a Zircaloy-4 (Zry-4) alloy surface by multi-arc ion plating under different process parameters. The ability of Cr coating on Zry-4 alloy cladding to improve the oxidation resistance to prevent a loss-of-coolant accident (LOCA) was studied. The microstructure of Cr coating was analyzed using the EBSD technique, and the high-temperature steam oxidation was tested at 800, 1000 and 1200 °C. Compared with the original Zry-4 alloy, the samples with Cr coatings exhibited much better oxidation resistance under different high-temperature steam oxidation conditions. However, the Cr coating exhibited columnar grain, strong preferred orientation and (001) fiber texture. The columnar grain boundaries provided paths for the diffusion of oxygen atoms to the Zry-4 alloy matrix at high temperatures. The results showed that the oxidation film of Cr coating with relatively random grain orientation was compact and uniform and exhibited the best oxidation resistance at high temperatures.

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“…Several coatings, such as metal coatings (Cr [5][6][7][8][9], Mo [10] and FeCrAl [11]), ceramic coatings (TiAlCrN [1] and Ti 2 AlC [12,13]), and multilayer coatings (Cr-Zr/Cr/CrN [14] and TiN/TiAlN [1]), have been carried out under high-temperature conditions. Although the above various coatings exhibit exceptional corrosion resistance, many significant challenges remain in fuel cladding applications.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of FeCoNiCrMo High-Entropy Coatings by Atmospheric Plasma Spraying on Zircaloy-4 in Steam at 1100 °C

Wen

Yang

et al. 2022

Crystals

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As a potential accident-tolerant fuel cladding material, we studied the method of preparing FeCoNiCrMo coatings on zircaloy-4 substrates by atmospheric plasma spraying (APS) technology to explore the high-temperature oxidation behavior of the FeCoNiCrMo coatings at 1100 °C in high-temperature steam. Various surface analysis techniques such as X-ray diffraction, electron probe microanalysis, and scanning electron microscopy were used to analyze the phase composition and microstructure of the oxidized products. The oxidation behavior of the FeCoNiCrMo coatings and the diffusion of the FeCoNiCrMo coatings to the zircaloy-4 substrates were analyzed. After oxidation at 1100 °C, a dense Cr2O3 oxide layer was formed on the coating’s surface, which grew from 1.5 to 3 μm after 15 to 60 min of oxidation, and the FeCoNiCrMo coatings and the substrates diffused simultaneously. The oxidation tests showed that the FeCoNiCrMo coatings prepared by APS can effectively delay the oxidation of zircaloy-4 substrates.

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Oxidation behavior and Cr-Zr diffusion of Cr coatings prepared by atmospheric plasma spraying on zircaloy-4 cladding in steam at 1300 °C

Cited by 35 publications

References 49 publications

Diffusion coatings formation features, obtained by complex chemical-thermal treatment on the structural steels

Diffusion coatings formation features, obtained by complex chemical-thermal treatment on the structural steels

Investigation on Microstructures and High-Temperature Oxidation Resistance of Cr Coatings on Zircaloy-4 by Multi-Arc Ion Plating Technology

Oxidation Behavior of FeCoNiCrMo High-Entropy Coatings by Atmospheric Plasma Spraying on Zircaloy-4 in Steam at 1100 °C

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