Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Oxidation and Electrical Properties of (LaSr)(CrCo)3Coated STS-430 Steel by Plasma Spraying

플라즈마 스프레이 (LaSr)(CrCo)O3 코팅된 STS-430 합금의 고온 산화 거동 및 전기적 특성

  • Lee, Chung-Hwan (Department of Nanomaterials Engineering, Chungnam National University) ;
  • Lim, Kyeong-Tae (Department of Nanomaterials Engineering, Chungnam National University) ;
  • Baik, Kyeong-Ho (Department of Nanomaterials Engineering, Chungnam National University)
  • Published : 2009.06.28
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Abstract

Fe-Cr steels are the most promising candidate for interconnect in solid oxide fuel cells. In this study, an effective, dense and well adherent (LaSr)(CrCo)$O_3$ [LSCC] coating layer was produced onto 430 stainless steel (STS-430) by atmospheric plasma spraying and the oxidation behavior as well as electrical properties of the LSCC coated STS-430 were investigated. A significant oxidation of pristine STS-430 occurred at $800^{\circ}C$ in air environment, leading to the formation of $Cr_2O_3$ and $FeCr_2O_4$ scale layer up to ${\sim}7{\mu}m$ after 1200h, and consequently increased an area specific resistance of $330\;m{\Omega}{\cdot}cm^2$. Although the plasma sprayed LSCC coating contained the characteristic pore network, the coated samples presented apparent advantages in reducing oxidation growth of STS-430, resulting a decrease in oxide scale thickness of ${\sim}1{\mu}m$ at $800^{\circ}C$ after 1200h. The area specific resistance of the LSCC coated STS-430 was much reduced to ${\sim}7\;m{\Omega}{\cdot}cm^2$ after exposure at $800^{\circ}C$ for 1200h, compared to that of the pristine STS-403.

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