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Three-dimensional shrinkage behavior of green tapes derived from spherical-shaped powders

Experimentical studies and numerical simulations
 
: Fu, Z.; Polfer, P.; Kraft, T.; Roosen, A.

:

Journal of the European Ceramic Society 35 (2015), Nr.8, S.24132425
ISSN: 0955-2219
Deutsche Forschungsgemeinschaft DFG
KR1729/9
Deutsche Forschungsgemeinschaft DFG
RO653/12
Englisch
Zeitschriftenaufsatz
Fraunhofer IWM ()
tape casting; anisotropic shrinkage; ceramic sintering; discrete element method; simulation

Abstract
In tape-cast products a higher shrinkage is observed in the thickness direction compared to the in-plane shrinkage, which is attributed to an anisotropic green tape microstructure caused by shearing and drying during manufacturing. In the present study, cast tapes composed of spherical particles were investigated experimentally and numerically. The shrinkage behavior was analyzed after binder removal and sintering at different temperatures in all three spatial directions. The correlation between anisotropic shrinkage and microstructure concerning pore orientation and coordination number was discussed. Furthermore, it is shown that the anisotropic shrinkage during binder removal contributes strongly to the total shrinkage anisotropy.

: http://publica.fraunhofer.de/dokumente/N-370415.html