플라즈마 스프레이 (LaSr)(CrCo)O3 코팅된 STS-430 합금의 고온 산화 거동 및 전기적 특성
Oxidation and Electrical Properties of (LaSr)(CrCo)O3 Coated STS-430 Steel by Plasma Spraying
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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)O3 [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℃ in air environment, leading to the formation of Cr2O3 and FeCr2O4 scale layer up to ~7㎛ after 1200h, and consequently increased an area specific resistance of 330 ㏁·㎠. 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 ~1 ㎛ at 800℃after 1200h. The area specific resistance of the LSCC coated STS-430 was much reduced to ~7 ㏁·㎠ after exposure at 800℃ for 1200h, compared to that of the pristine STS-403.
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)O3 [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℃ in air environment, leading to the formation of Cr2O3 and FeCr2O4 scale layer up to ~7㎛ after 1200h, and consequently increased an area specific resistance of 330 ㏁·㎠. 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 ~1 ㎛ at 800℃after 1200h. The area specific resistance of the LSCC coated STS-430 was much reduced to ~7 ㏁·㎠ after exposure at 800℃ for 1200h, compared to that of the pristine STS-403.
참고문헌 (13)
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