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Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) feedstock development and optimization for thermoplastic forming of thin planar and tubular oxygen separation membranes

  • Salehi, Mehdi Laboratory for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Duebendorf, Switzerland - The Fribourg Center for Nanomaterials (FriMat) and Department of Geosciences, University of Fribourg, Switzerland
  • Clemens, Frank Laboratory for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Duebendorf, Switzerland
  • Pfaff, Ewald M. Institute for Materials Applications in Mechanical Engineering, RWTH Aachen University, Germany
  • Junior, Roberto M. Department of Materials, Federal University of Rio Grande do Sul, Brazil
  • Bergmann, Carlos P. Department of Materials, Federal University of Rio Grande do Sul, Brazil
  • Diethelm, Stefan Industrial Energy System Laboratory (LENI), IGM, Ecole Polytechnique Fédérale de Lausanne, Switzerland
  • Neururer, Christoph The Fribourg Center for Nanomaterials (FriMat) and Department of Geosciences, University of Fribourg, Switzerland
  • Graule, Thomas Laboratory for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Duebendorf, Switzerland
  • Grobéty, Bernard The Fribourg Center for Nanomaterials (FriMat) and Department of Geosciences, University of Fribourg, Switzerland
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    2013
Published in:
  • Journal of Membrane Science. - 2013, vol. 443, p. 237-245
Thermoplastic forming
BSCF
Shape stability
Binder system
Oxygen permeation flux
English This paper presents the processing steps for producing thin planar and tubular oxygen separation membranes by thermoplastic forming of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) with polystyrene (PS) and stearic acid (SA) as binder. The influence of powder content on the shape stability of thin membranes (tubular and planar structures) during the thermoplastic processing route was investigated. The effect of powder content on mixing torque and the rheological behavior were investigated. The effect of the powder content could be analytically described using the model proposed by Frankel and Acrivos. The deformation of free standing green bodies was investigated using disks. The result showed that increasing the powder content is remarkably effective to minimize the deformation of the membrane during the thermal debinding step. By using a high powder content (60 vol. %) and a multicomponent binder system composed of PS, SA and paraffin wax (PW), it was possible to achieve disks and thin wall tubular structures without deformation after sintering. Using capillary rheometer an unexpected decrease in the total extrusion pressure was measured for the feedstock containing PW. The change in apparent activation energy between 800–1000 °C was not related to the membrane properties.
Faculty
Faculté des sciences et de médecine
Department
Département de Géosciences
Language
  • English
Classification
Mineralogy
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/303133
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