Weibull strength variations between room temperature and high temperature Ni-3YSZ half-cells

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Abstract

Solid oxide fuel cell stacks are vulnerable to mechanical failures. One of the most relevant failure mechanisms is brittle fracture of the individual ceramic cells, which are an integral part of the stack structure. Even the mechanical failure of one cell can lead to temporary interruption, reduced efficiency, increased degradation and/or the complete termination of a functioning stack. This paper investigates the effects of temperature on the mechanical strength of 3% yttria-stabilised zirconia half-cells. Strength was measured using a four-point bend method at room temperature and at 600°C, 700°C and 800°C in a reducing atmosphere. The strength of an as sintered half-cell was also measured at room temperature for comparison. Weibull analysis was performed on large sample sets of 30 for statistical viability. The Weibull strength and elastic modulus of the room temperature tested reduced samples show a decrease of approximately 33% and 51% respectively, when compared to the oxidized samples tested at room temperature. When tested at elevated temperatures both Weibull strength and elastic modulus decrease further when compared to the room temperature reduced samples. However these further reductions are more likely due to thermal interactions with the microstructure of the materials. The Weibull modulus displays a decrease in the room temperature reduced and elevated temperature samples when compared to the room temperature oxidised samples.
Original languageEnglish
Title of host publicationAdvances in Solid Oxide Fuel Cells VIII - 36th International Conference on Advanced Ceramics and Composites, ICACC 2012
PublisherAmerican Ceramic Society
Publication date2013
Pages61-69
ISBN (Print)9781118205945
DOIs
Publication statusPublished - 2013
Event36th International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
Duration: 22 Jan 201227 Jan 2012
Conference number: 36

Conference

Conference36th International Conference on Advanced Ceramics and Composites
Number36
Country/TerritoryUnited States
CityDaytona Beach, FL
Period22/01/201227/01/2012
SeriesCeramic Engineering and Science Proceedings
Number4
Volume33
ISSN0196-6219

Keywords

  • Brittle fracture
  • Ceramic materials
  • Cytology
  • Elastic moduli
  • Failure (mechanical)
  • Sintering
  • Solid oxide fuel cells (SOFC)
  • Weibull distribution
  • Zirconia
  • Cells

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