Effect of a zirconia interlayer on the morphological properties of LaSrMnO3- 4YSZ composite films obtained by spin coating

• Autor(a) principal: Macedo, Daniel Araújo de
• Data de Publicação: 2011
• Outros Autores: Souza, Graziele L., Cesário, Moises Rômolos, Cela, Beatriz, Martinelli, Antonio Eduardo, Paskocimas, Carlos Alberto, Nascimento, Rubens Maribondo do
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/31732
• topic: Composite cathodes; Interlayer; Microstructure; Spin coating; SOFC

In this study, a chemical route was adopted to obtain strontium-doped lanthanum manganite (LaSrMnO3 or LSM) powders in order to prepare LaSrMnO3-4YSZ (4 mol% Y2O3) composite films by the suspension spin coating method onto 4YSZ and 8YSZ/8YSZ-NiO substrates with or without the application of a zirconia interlayer in the film/substrate interface. The multilayers were sintered at 1150 o C for 6 h and the effect of the interlayer on the morphological properties of the films has been investigated by scanning electron microscopy. The results show that in the less roughn substrates the application of the interlayer (~500 nm) not only improved the adhesion in the film/substrate interface, but also avoided new coating failures. All the films were porous, crack-free and with a thickness below 30 μm, desirable features for application as SOFC cathodes