Modeling constrained sintering of bi-layered tubular structures

Tesfaye Tadesse Molla, Dhavanesan Kothanda Ramachandran, De Wei Ni, Vincenzo Esposito, Francesca Teocoli, Eugene A. Olevsky, Rasmus Bjørk, Nini Pryds, Andreas Kaiser, Henrik Lund Frandsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Constrained sintering of tubular bi-layered structures is being used in the development of various technologies. Densification mismatch between the layers making the tubular bi-layer can generate stresses, which may create processing defects. An analytical model is presented to describe the densification and stress developments during sintering of tubular bi-layered samples. The correspondence between linear elastic and linear viscous theories is used as a basis for derivation of the model. The developed model is first verified by finite element simulation for sintering of tubular bi-layer system. Furthermore, the model is validated using densification results from sintering of bi-layered tubular ceramic oxygen membrane based on porous MgO and Ce0.9Gd0.1O1.95-d layers. Model input parameters, such as the shrinkage kinetics and viscous parameters are obtained experimentally using optical dilatometry and thermo-mechanical analysis. Results from the analytical model are found to agree well with finite element simulations as well as measurements from sintering experiment.
Original languageEnglish
JournalJournal of the European Ceramic Society
Volume35
Issue number3
Pages (from-to)941–950
ISSN0955-2219
DOIs
Publication statusPublished - 2015

Keywords

  • Constrained sintering
  • Oxygen membrane
  • Sintering
  • Stress
  • Tubular bi-layer
  • Stresses
  • Bi-layer
  • Oxygen membranes
  • Tubular structures

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