manufacture of solid oxide fuel cells by co-extrusion
DESCRIPTION
Presentation from the Fourth International Conference on the Shaping of Advanced Ceramics.TRANSCRIPT
Manufacture of Solid Oxide Fuel
Cells byCo-extrusion
Jonathan Powell1,2 and Stuart Blackburn2,3
1. Department of Metallurgy and Material Science2. Interdisciplinary Research Centre in Materials Processing3. Department of Chemical Engineering
Project summary
Rheology Packing density Co-extruder design Pressure modelling Co-extrusion
Motivation
Sustainable energy production. Wide range of fuels Rapid start up Thermally and mechanically stable High power densities High production costs
Objectives and scopeMicro tubularsolid oxide fuel cell
Co-extrusion
Liang & Blackburn, J. Mat. Sci., 37, 2002
Stage 1 Stage 2
Stage 3 Stage 4
Building of repeating units
Multi-billet extrusionBuilding of laminated tube
Paste rheology unification The pastes must flow in a uniform
manner The pastes must therefore have
unified rheological properties
Prediction of powder packing densities
Packing predictions from extended Westman model
Paste rheological characterisation
nm VD
L
D
DVPPP
0
0021 4ln)(2
o Bulk yield stress
Velocity factor convergent flow
n Velocity exponent convergent flow
Die wall shear stress
Die wall velocity factor
m Die wall velocity exponent
Rheological unification
Co-extruder design
Co-extruder design features
nm VAMLVAAPPP 00021 ln
Co-extruder design features
cot1lncot22
0
10010
nnm
D
D
n
V
D
DVP
nn
Dc
DccDcD
nc
V
cDDP
cot
cottantan
1cos
00
00
Pressure predictions
Co-extrudate
Sintered microtube
Conclusions
Shaping of multilayered ceramic microtubes.
Formulation paste predictions. Predict co-extrusion pressures. Adapted for continuous co-processing
of complete SOFCs
Acknowledgements
Thanks goes to; Prof Stuart Blackburn for his support
and supervision EPSRC for the funding of this research Sandvik for funding my participation in
this conference
S Blackburn 2004