Numerical modeling of cathode contact material densification

Brian J. Koeppel, Wenning Liu, Elizabeth V. Stephens, Moe A. Khaleel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationCeramic Engineering and Science Proceedings
Pages171-181
Number of pages11
Volume32
Edition4
Publication statusPublished - 2 Dec 2011
Externally publishedYes
EventAdvances in Solid Oxide Fuel Cells VII - 35th International Conference on Advanced Ceramics and Composites, ICACC - Daytona Beach, FL, United States
Duration: 23 Jan 201128 Jan 2011

Other

OtherAdvances in Solid Oxide Fuel Cells VII - 35th International Conference on Advanced Ceramics and Composites, ICACC
CountryUnited States
CityDaytona Beach, FL
Period23/1/1128/1/11

Fingerprint

Densification
Cathodes
Sintering
Solid oxide fuel cells (SOFC)
High temperature operations
Processing
Compressive stress
Temperature
Thermal expansion
Screening
Heat treatment

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Koeppel, B. J., Liu, W., Stephens, E. V., & Khaleel, M. A. (2011). Numerical modeling of cathode contact material densification. In Ceramic Engineering and Science Proceedings (4 ed., Vol. 32, pp. 171-181)

Numerical modeling of cathode contact material densification. / Koeppel, Brian J.; Liu, Wenning; Stephens, Elizabeth V.; Khaleel, Moe A.

Ceramic Engineering and Science Proceedings. Vol. 32 4. ed. 2011. p. 171-181.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Koeppel, BJ, Liu, W, Stephens, EV & Khaleel, MA 2011, Numerical modeling of cathode contact material densification. in Ceramic Engineering and Science Proceedings. 4 edn, vol. 32, pp. 171-181, Advances in Solid Oxide Fuel Cells VII - 35th International Conference on Advanced Ceramics and Composites, ICACC, Daytona Beach, FL, United States, 23/1/11.
Koeppel BJ, Liu W, Stephens EV, Khaleel MA. Numerical modeling of cathode contact material densification. In Ceramic Engineering and Science Proceedings. 4 ed. Vol. 32. 2011. p. 171-181
Koeppel, Brian J. ; Liu, Wenning ; Stephens, Elizabeth V. ; Khaleel, Moe A. / Numerical modeling of cathode contact material densification. Ceramic Engineering and Science Proceedings. Vol. 32 4. ed. 2011. pp. 171-181
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