Fracture strength and Weibull analysis of Ba0.5Sr0.5Co0.8Fe0.2O3−δ oxygen transport membranes evaluated by biaxial and uniaxial bending tests

Li Wang, Rui Dou, Gong Wang, Yizhe Li, M. Bai, David Hall, Ying Chen

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The present study evaluates the fracture strengths and the Weibull modulus of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) oxygen transport membranes by means of biaxial and uniaxial bending tests at both room temperature (RT) and 800 °C. The fracture strengths obtained from the biaxial bending tests are much lower than those obtained from the uniaxial bending tests while Weibull moduli (m) are similar. By utilising Weibull statistics the uniaxial strengths can be predicted from the biaxial values at both RT and 800 °C. Fracture surfaces at both RT and 800 °C show only a transgranular fracture mode. Failure origins are also determined by scanning electron microscope (SEM) based on the fractographic principles. Most defects determining the fracture strength of this particular material are found to be pores with a relatively large size.
Original languageEnglish
Pages (from-to)292-299
Number of pages8
JournalMaterials Science and Engineering A
Volume670
Early online date12 Jun 2016
DOIs
Publication statusPublished - 18 Jul 2016
Externally publishedYes

Keywords

  • Bscf
  • Fracture strength
  • Biaxial method
  • Uniaxial method
  • Weibull modulus

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