TY - GEN
T1 - Numerical modeling of cathode contact material densification
AU - Koeppel, Brian J.
AU - Liu, Wenning
AU - Stephens, Elizabeth V.
AU - Khaleel, Moe A.
PY - 2011
Y1 - 2011
N2 - Numerical modeling was used to simulate the constrained sintering process of the cathode contact layer during assembly of solid oxide fuel cells (SOFCs). A finite element model based on the continuum theory for sintering of porous bodies was developed and used to investigate candidate low-temperature cathode contact materials. Constitutive parameters for various contact materials under development were estimated from dilatometry screening tests, and the influence of processing time, processing temperature, initial grain size, and applied compressive stress on the free sintering response was predicted for selected candidate materials. The densification behavior and generated stresses within a 5-cell planar SOFC stack during sintering, high temperature operation, and room temperature shutdown were predicted. Insufficient constrained densification was observed in the stack at the proposed heat treatment, but beneficial effects of reduced grain size, compressive stack preload, and reduced thermal expansion coefficient on the contact layer densification and stresses were observed.
AB - Numerical modeling was used to simulate the constrained sintering process of the cathode contact layer during assembly of solid oxide fuel cells (SOFCs). A finite element model based on the continuum theory for sintering of porous bodies was developed and used to investigate candidate low-temperature cathode contact materials. Constitutive parameters for various contact materials under development were estimated from dilatometry screening tests, and the influence of processing time, processing temperature, initial grain size, and applied compressive stress on the free sintering response was predicted for selected candidate materials. The densification behavior and generated stresses within a 5-cell planar SOFC stack during sintering, high temperature operation, and room temperature shutdown were predicted. Insufficient constrained densification was observed in the stack at the proposed heat treatment, but beneficial effects of reduced grain size, compressive stack preload, and reduced thermal expansion coefficient on the contact layer densification and stresses were observed.
UR - http://www.scopus.com/inward/record.url?scp=82355170772&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:82355170772
SN - 9781118059890
T3 - Ceramic Engineering and Science Proceedings
SP - 171
EP - 181
BT - Advances in Solid Oxide Fuel Cells VII - A Collection of Papers Presented at the 35th International Conference on Advanced Ceramics and Composites, ICACC
T2 - Advances in Solid Oxide Fuel Cells VII - 35th International Conference on Advanced Ceramics and Composites, ICACC
Y2 - 23 January 2011 through 28 January 2011
ER -
