Effect of polymers on ceramic suspension rheology and green component properties

Jennifer A. Lewis, Andrea L. Ogden, David Schroeder, Kirk J. Duchow

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ceramic suspensions were formulated based on an alumina/plasticized-polymer system. The total polymer volume in suspension was held constant, while the relative amount of high-to-low molecular weight polyvinyl butyral (PVB) in suspension was varied. Experiments were performed to elucidate the effects of polymer molecular weight and distribution on the rheological properties of these casting suspensions as well as on the green microstructure of tape-cast components. The polymer properties affected not only the suspension viscosity at a given shear rate as expected, but also the shear thinning behavior of each suspension. Tapes (thickness ≈250 μm) were cast from these suspensions and their properties were evaluated. Pore volume, a measure of the packing efficiency, was found to depend strongly on the polymer molecular weight and distribution. In addition, preliminary lamination studies revealed that dimensional stability and anisotropy were also affected by the relative amount of high-to-low molecular weight PVB. A direct correlation was shown to exist between the shear thinning behavior of these suspensions and the resulting dimensional anisotropy exhibited by the tapes cast from each of them. These results demonstrate that polymeric aids influence not only the suspension rheology, but the green component microstructure as well, and, hence, are an integral aspect of ceramic processing.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium Proceedings
PublisherPubl by Materials Research Society
Pages117-122
Number of pages6
ISBN (Print)1558991840
StatePublished - Jan 1 1993
EventSymposium on Atomic-scale Imaging of Surfaces and Interfaces -
Duration: Nov 30 1992Dec 2 1992

Publication series

NameMaterials Research Society Symposium Proceedings
Volume289
ISSN (Print)0272-9172

Other

OtherSymposium on Atomic-scale Imaging of Surfaces and Interfaces
Period11/30/9212/2/92

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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