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Residual Stress Generation During Constrained Sintering Of Layered Ceramic Thin Film Structures

Published online by Cambridge University Press:  10 February 2011

E. P. Busso ,
R. P. Travis  and
L. Chandra
E. P. Busso
Affiliation:
Mechanical Engineering Department, Imperial College, London SW7 2BX, United Kingdom
R. P. Travis
Affiliation:
Mechanical Engineering Department, Imperial College, London SW7 2BX, United Kingdom
L. Chandra
Affiliation:
Mechanical Engineering Department, Imperial College, London SW7 2BX, United Kingdom
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Abstract

This work investigates the sintering kinetics and residual stresses which develop in thin layered ceramic structures when sintered on a rigid substrate. A continuum constitutive framework to model the evolution of the microstructure and stresses in the sintering layers under non-isothermal conditions is presented. The sintering model is used to investigate the constrained sintering behaviour of layered ceramic structures used in solid oxide fuel cells (SOFC). Samples of a 50 μm thick SOFC film were screen-printed on a fully dense yttriastabilised zirconia substrate and then sintered at temperatures ranging from 1100°C to 1300°C. Measured values of relative density and average grain size are compared with model predictions. A correlation between residual stresses extracted from curvature measurements and analytical predictions revealed these stresses to have been mostly relieved during the subsequent cooling by microcrack formation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 505 , 1997 , 547
Copyright
Copyright © Materials Research Society 1998

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References

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