• Title/Summary/Keyword: metallic fuel

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Effects of Cobalt Protective Coating Prepared by DC Electroplating on Ferritic Stainless Steel for SOFC Interconnect (직류 전기도금을 이용한 고체산화물 연료전지 금속연결재용 페라이트계 스테인리스 스틸의 코발트 보호막 코팅 효과)

  • Hong, Jong-Eun;Lim, Tak-Hyung;Song, Rak-Hyun;Lee, Seung-Bok;Shin, Dong-Ryul;Yoo, Young-Sung;Lee, Dok-Yol
    • Journal of Hydrogen and New Energy
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    • v.20 no.2
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    • pp.116-124
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    • 2009

  • We investigated the influences of cobalt coating deposited by DC electroplating on the ferritic stainless steel, STS 430, as a protective layer on a metallic interconnect for SOFC applications. Cobalt coated STS 430 revealed a uniform and denser-packing oxide surface and a reduced growth rate of $Cr_2O_3$ scales after oxidation at $800^{\circ}C$in air. Cobalt coating layer was oxidized to $CoCo_2O_4$ and Co containing mixed oxide spinels such as $Co_2CrO_4$, $CoCr_2O_4$, and $CoCrFeO_4$. The area specific resistance value of Co coated sample was $0.020\;{\Omega}cm^2$ lower than that of uncoated at $800^{\circ}C$ in air during 500 h. After 1000 h oxidation, cobalt oxide coating layer suppressed chromium outward diffusion.

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Effect of Vapor Deposition on the Interdiffusion Behavior between the Metallic Fuel and Clad Material (금속연료-피복재 상호확산 거동에 미치는 기상증착법의 영향)

  • Kim, Jun Hwan;Lee, Byoung Oon;Lee, Chan Bock;Jee, Seung Hyun;Yoon, Young Soo
    • Korean Journal of Metals and Materials
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    • v.49 no.7
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    • pp.549-556
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    • 2011

  • This study aimed to evaluate the performance of diffusion barriers in order to prevent fuel-cladding chemical interaction (FCCI) between the metallic fuels and the cladding materials, a potential hazard for nuclear fuel in sodium-cooled fast reactors. In order to prevent FCCI, Zr or V metal is deposited on the ferritic-martensitic stainless steel surface by physical vapor deposition with a thickness up to $5{\mu}m$. The diffusion couple tests using uranium alloy (U-10Zr) and a rare earth metal such as Ce-La alloy and Nd were performed at temperatures between 660~800$^{\circ}C$. Microstructural analysis using SEM was carried out over the coupled specimen. The results show that significant interdiffusion and an associated eutectic reaction ocurred in the specimen without a diffusion barrier. However, with the exception of the local dissolution of the Zr layer in the Ce-La alloy, the specimens deposited with Zr and V exhibited superior eutectic resistance to the uranium alloy and rare earth metal.

  • https://doi.org/10.3365/KJMM.2011.49.7.549 인용 KSCI