La0.7Sr0.3MnO3 (- delta) barrier for Cr2O3-forming SOFC interconnect alloy coated by electrostatic spray deposition

Autor(es)

da Conceicao, Leandro ^{[1, 2]} ; Dessemond, Laurent ^[2] ; Djurado, Elisabeth ^[2] ; Muccillo, E. N. S. ^[1]

Afiliação do(s) autor(es)

^[1] Energy & Nucl Res Inst IPEN, BR-05422970 Sao Paulo, SP - Brazil

^[2] Univ Grenoble 1, Univ Savoie, CNRS, UMR 5279, Grenoble INP, LEPMI, Lab DElectrochim & Phys Chim M, F-38402 St Martin Dheres - France

• Tipo de documento: Artigo Científico
• Fonte: SURFACE & COATINGS TECHNOLOGY; v. 254, p. 157-166, SEP 15 2014.
• Citações Web of Science: 11

Resumo

In this work, electrostatic spray deposition (ESD) technology was used to deposit dense, free-cracks and thin La0.7Sr0.3MnO3 (- delta) (LSM) layers on SS446 alloy interconnect to be used in solid oxide fuel cell (SOFC) after subsequent annealing at 800 degrees C in air for 2 h. The corrosion resistance of uncoated and LSM-coated steels has been studied by electrical and thermogravimetric measurements. The oxidation rate was strongly reduced for LSM-coated steel in ambient air and pure oxygen at 800 degrees C for 250 h. It was found for the first time that a dense LSM coating as thin as 300 nm efficiently reduces the oxidation rate by limiting outward Cr3+ diffusion. A protective chromia scale was detected by SEM and EDS at the interfacial layer. The area specific resistance (ASR) of LSM-coated SS446 was found very low (30 mil.cm(2)) and stable in comparison with the uncoated one (80 m Omega.cm(2)) after 200 h oxidation in air at 800 degrees C. The results of this work demonstrate the possibility of automated production of dense conductive interconnect LSM-coated materials and give a standard thickness to obtain stable long-term operation. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/07648-3 - Filmes de La0,7Sr0,3Mn03δ depositados por spray eletrostático em liga de Fe-Cr aplicada como interconector de célula a combustível de óxido sólido (SOFC)
• Beneficiário: Leandro da Conceicao
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 11/51689-3 - Desenvolvimento de filmes de LSM suportado no interconector metálico para aplicação em células a combustível de óxido sólido (SOFC)
• Beneficiário: Leandro da Conceicao
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado