Proposal of a modified four-point bending method for determining interfacial fracture energy at electrode/electrolyte interfaces in SOFCs

K. Kumada, K. Sato, Y. Asoh, T. Hashida

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

Abstract

This study proposes the use of all-ceramic modified four-point bending specimens consisting of a thin porous electrode layer sandwiched between two dense electrolyte beams to determine the fracture energy of the electrolyte/electrode interface. The sandwich arrangement was effective to prevent the premature vertical cracking of the electrode and to eliminate the use of polymeric adhesives for metallic stiffeners which restricted the testing temperature range. The experiments conducted at room temperature using the all-ceramic layered specimens demonstrated that the proposed four-point bending method successfully induced delamination between the electrode and electrolyte producing the characteristic plateau behavior in the load-displacement records and enabled the interfacial fracture energy to be evaluated based on the load level at the plateau. The interfacial fracture energies were determined to be 5.6 J/m2 for the interface of NiO-8YSZ/3YSZ and 0.8 J/m2 for LSCF6428/8YSZ using the identical testing method and specimen configuration.

Original languageEnglish
Title of host publicationSolid Oxide Fuel Cells 16, SOFC 2019
EditorsK. Eguchi, S. C. Singhal
PublisherElectrochemical Society Inc.
Pages825-835
Number of pages11
Edition1
ISBN (Electronic)9781607688747
DOIs
Publication statusPublished - 2019 Jan 1
Event16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019 - Kyoto, Japan
Duration: 2019 Sep 82019 Sep 13

Publication series

NameECS Transactions
Number1
Volume91
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019
CountryJapan
CityKyoto
Period19/9/819/9/13

ASJC Scopus subject areas

  • Engineering(all)

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