The effects of oxygen vacancy concentration on the mechanical properties of zirconia and ceria-based electrolytes for sofcs

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

1 Citation (Scopus)

Abstract

In this paper, we discuss the effects of different oxygen partial pressures on the deformation property and fracture characteristics of representative constituent materials for solid oxide fuel cells (SOFCs). The elastic modulus and fracture strength of 8 mol% yittria stabilized zirconia (8YSZ) and 10 mol% gadolinia doped ceria (10GDC) treated under different oxygen partial pressures were evaluated using the small-punch testing method in this study. The specimens of 8YSZ and 10GDC prepared by a sintering process were treated at 800 °C under an oxygen partial pressure in the range of 0.21 to 10-22 atm for 1 hour. The treated specimens were then fast cooled down to a room temperature, and their mechanical properties were measured under an atmospheric pressure condition by using the small-punch testing method. The experimental results revealed that both the elastic modulus and fracture strength of the IOGDC decreased drastically when the oxygen partial pressure of the treatment was less than 10-15 atm, whereas no significant variation in both the mechanical properties was observed for the 8YSZ. The elastic modulus and fracture strength of IOGDC for the treatment under 10-22 atm was reduced down to 10-20 % of those treated under the atmospheric pressure. SEM observations revealed that the fracture surface of the IOGDC specimens was changed from transgranular mode to intergranular mode when the oxygen partial pressure was reduced, whereas the fracture surface of the 8YSZ specimens was transgranular regardless of the different oxygen partial pressures.

Original languageEnglish
Title of host publicationProceedings of the 7th International Conference on Fuel Cell Science, Engineering, and Technology 2009
Pages773-777
Number of pages5
DOIs
Publication statusPublished - 2009 Dec 1
Event7th International Conference on Fuel Cell Science, Engineering, and Technology 2009 - Newport Beach, CA, United States
Duration: 2009 Jun 82009 Jun 10

Publication series

NameProceedings of the 7th International Conference on Fuel Cell Science, Engineering, and Technology 2009

Other

Other7th International Conference on Fuel Cell Science, Engineering, and Technology 2009
CountryUnited States
CityNewport Beach, CA
Period09/6/809/6/10

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology

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