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Kinetic analysis of the polymer burnout in ceramic thermoplastic processing of the YSZ thin electrolyte structures using model free method

  • 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
  • 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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    17.03.2012
Published in:
  • Applied Energy. - 2012, vol. 95, p. 147-155
Thermoplastic process
Binder burnout
Model free method
YSZ electrolytes
Kinetics analysis
English Polymeric binder burnout during thermoplastic processing of yttria stabilized zirconia (YSZ) ceramics were analyzed using thermogravimetric analysis (TGA). The debinding kinetics of the stearic acid/polystyrene binder have been described using model free methods and compared with the decomposition rate of the pure polymers. The apparent activation energy Eα as a function of debinding progress α was calculated in two atmospheres (argon and air) by three different methods: Ozawa–Flynn–Wall (OFW), Kissinger–Akahira–Sunose (KAS) and Friedman. The evolution of Eα with α is compatible with the evaporation of stearic acid and the unzipping and thermo-oxidative decomposition mechanisms proposed for polystyrene. The apparent activation energies obtained for the experiments under argon revealed the increased concentration of weak links in polystyrene introduced during kneading of the feedstock. Extrapolation of the kinetic parameters obtained in one run to calculate decomposition rates under different heating rates confirmed the excellent predictive power of the direct methods.
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/302366
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