Journal Article

PreJuSER-17252

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mechanical Characterization of Porous Ba0.5Sr0.5Co0.8Fe0.2O3d

Lipinska-Chwalek, M.FZJ* ; Malzbender, J.FZJ* ; Chanda, A. ; Baumann, S.FZJ* ; Steinbrech, R. W.FZJ*

2011
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jeurceramsoc.2011.07.002

Abstract: The mechanical stability of porous Ba0.5Sr0.5Co0.8Fe0.2O3-d (BSCF) material was investigated using depth-sensitive microindentation and ring-on-ring biaxial bending tests. The porous BSCF was characterized as potential substrate material for the deposition of a dense membrane layer. Indentation tests yielded values for hardness and fracture toughness up to a temperature of 400 degrees C, while bending tests permitted an assessment of elastic modulus and fracture stress up to 800 degrees C. In addition the fracture toughness was evaluated up to 800 degrees C measuring in bending tests the fracture stress of pre-indented specimens. The results proof that the indentation-strength method can be applied for the determination of the fracture toughness of this porous material. In comparison to dense material the values of the mechanical parameters were as expected lower but the temperature dependences of elastic modulus, fracture strength and toughness were similar to those reported for dense BSCF. (C) 2011 Elsevier Ltd. All rights reserved.

Keyword(s): J ; Mechanical properties (auto) ; Fracture (auto) ; Strength (auto) ; Perovskites (auto) ; Membranes (auto)

Note: Financial support from the Federal Ministry of Economics and Technology via the MEM-OXYCOAL project (grant no. 0327803) is gratefully acknowledged. The authors would like to thank W.A. Meulenberg and F. Schulze-Kuppers for preparing and providing the porous BSCF specimens and R. Kuppers for his experimental and technical support in the mechanical tests. In addition, most valuable SEM investigations provided by E. Wessel are gratefully acknowledged.

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)
2. Werkstoffsynthese und Herstellverfahren (IEK-1)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2011

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