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Camber Evolution and Stress Development of Porous Ceramic Bilayers During Co‐Firing
Author(s) -
Ni DeWei,
Esposito Vincenzo,
Schmidt Cristine Grings,
Molla Tesfaye Tadesse,
Andersen Kjeld Bøhm,
Kaiser Andreas,
Ramousse Severine,
Pryds Nini
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12113
Subject(s) - materials science , sintering , dilatometer , composite material , ceramic , bilayer , shrinkage , porosity , slip (aerodynamics) , thermal expansion , membrane , physics , biology , genetics , thermodynamics
Camber evolution and stress development during co‐firing of asymmetric bilayer laminates, consisting of porous Ce 0.9 Gd 0.1 O 1.95 gadolinium‐doped cerium oxide ( CGO ) and La 0.85 Sr 0.15 MnO 3 lanthanum strontium manganate ( LSM )‐ CGO were investigated. Individual layer shrinkage was measured by optical dilatometer, and the uniaxial viscosities were determined as a function of layer density using a vertical sintering approach. The camber evolution in the bilayer laminates was recorded in situ during co‐firing and it was found to correspond well with the one predicted by the theoretical model. The estimated sintering mismatch stress in co‐fired CGO ‐ LSM / CGO bilayer laminates was significantly lower than general sintering stresses expected for free sintering conditions. As a result, no co‐firing defects were observed in the bilayer laminates, illustrating an acceptable sintering compatibility of the ceramic layers.