Thin films of La_0.7Sr_0.3MnO_{3鈭?span style='font-style: italic'>未} dip-coated on Fe-Cr alloys for SOFC metallic interconnect

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• 作者：Le ; ro da Concei莽茫o ; Laurent Dessemond ; Elisabeth Djurado ; Mariana M.V.M. Souza
• 关键词：Metallic interconnect ; La0.7Sr0.3MnO3&minus ; 未 ; Area specific resistance ; SOFC
• 刊名：International Journal of Hydrogen Energy
• 出版年：22 November, 2013
• 年：2013
• 卷：38
• 期：35
• 页码：15335-15347
• 全文大小：3469 K

文摘

La_0.7Sr_0.3MnO_{3鈭?em>未em>} (LSM) porous films were deposited on different ferritic stainless steels (SS) (430: Cr-16.0%; 439: Cr-16.6%; 444: Cr-17.4%) by sol-gel/dip-coating process. The structure, morphology and composition profiles of investigated assemblies were examined using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The area specific resistance (ASR) was measured during long term oxidation in air at 800聽掳C for 200聽h by DC measurements. ASR values lower than 10聽m惟聽cm² were recorded after 200聽h for LSM-coated SS439 and SS444. This is likely to be due to the high Cr content and to Nb, Ti and Mo elements used to stabilize the stainless steel against oxidation. This paper shows that LSM coatings provide an enhanced stability of the alloy at high temperature and the formation of an interfacial Cr-Mn spinel layer hinders the oxide scale growth.