Orientation relationship and interfaces in Ni and Co-YSZ cermets prepared from directionally solidified eutectics

• Authors: Angel Larrea , Miguel Laguna-Bercero , José Peña , Rosa Merino , Víctor Orera
• Languages of publication: EN

Abstracts

EN

Textured Ni-YSZ and Co-YSZ (YSZ: cubic yttria stabilized zirconia) cermets prepared by reduction of directionally solidified NiO-YSZ and CoO-YSZ oxide eutectics respectively display a self-organized microstucture formed by ∼400 nm wide alternating lamellae of YSZ and porous metal suitable for electrochemical applications. The electrochemical properties of the cermets depend on their microstructure. We have analyzed the orientation relationships and interfaces both of the oxide composites and cermets using Scanning Electron Microscopy, Transmission Electron Microscopy, X-ray pole figures and Electron Back-Scattering Diffraction. In spite of the similar crystal structure, growth habits and orientation relationships of NiO-YSZ and CoO-YSZ are different. Also the crystallographic behaviour, when cermets are produced, differs. However the metal-YSZ interfaces are about the most stable ones giving good metal-ceramic adhesion. Due to their lamellar microstructure and good metal-ceramic adhesion these composites present long-term stability at working conditions, which makes them good candidates to be used as anodes in solid oxide fuel cells or electrolyzers.

Keywords

EN

directionally solidified eutectics; cermets; fuel cells; microstructure

Discipline

• 68.35.-p: Solid surfaces and solid-solid interfaces: structure and energetics
• 68.37.-d: Microscopy of surfaces, interfaces, and thin films
• 81.05.Mh: Cermets, ceramic and refractory composites
• 82.47.Ed: Solid-oxide fuel cells (SOFC)

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2009
• Volume: 7
• Issue: 2
• Pages: 242-250

Dates

published

1 - 6 - 2009

online

26 - 4 - 2009

Contributors

author

Angel Larrea

• Instituto de Ciencia de Materiales de Aragón, CSIC- U., Zaragoza, E-50.018, Spain

author

Miguel Laguna-Bercero

• Instituto de Ciencia de Materiales de Aragón, CSIC- U., Zaragoza, E-50.018, Spain

author

José Peña

• Instituto de Ciencia de Materiales de Aragón, CSIC- U., Zaragoza, E-50.018, Spain

author

Rosa Merino

• Instituto de Ciencia de Materiales de Aragón, CSIC- U., Zaragoza, E-50.018, Spain

author

Víctor Orera

• Instituto de Ciencia de Materiales de Aragón, CSIC- U., Zaragoza, E-50.018, Spain

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Identifiers

DOI

10.2478/s11534-009-0030-z