Hostname: page-component-8448b6f56d-tj2md Total loading time: 0 Render date: 2024-04-24T12:57:34.613Z Has data issue: false hasContentIssue false
  • English
  • Français

The Effect of Polymers on Ceramic Suspension Rheology and Green Component Properties

Published online by Cambridge University Press:  15 February 2011

Jennifer A. Lewis ,
Andrea L. Ogden ,
David Schroeder  and
Kirk J. Duchow
Jennifer A. Lewis
Affiliation:
University of Illinois, Department of Materials Science and Engineering, Urbana, IL 61801
Andrea L. Ogden
Affiliation:
University of Illinois, Department of Materials Science and Engineering, Urbana, IL 61801
David Schroeder
Affiliation:
University of Illinois, Department of Materials Science and Engineering, Urbana, IL 61801
Kirk J. Duchow
Affiliation:
University of Illinois, Department of Materials Science and Engineering, Urbana, IL 61801
Get access

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 289: Symposium M – Flow and Microstructure of Dense Suspensions , 1992 , 117
Copyright
Copyright © Materials Research Society 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1] Mistler, R.E., “Tape Casting: The Basic Process for Meeting the Needs of the Electronic Industry,” Ceram. Bull. (1990).Google Scholar
[2] Tummala, R.R., “Ceramic Packaging,” pp. 455–521 in Microelectronics Packaging Handbook, eds. Tummala, R.R. and Rymaszewski, E.J., Van Nostrand Reinhold, NY, 1989.Google Scholar
[3] Lange, F.F., “Powder Processing Science and Technology for Increased Reliability,” J. Am. Ceram. Soc., 72 [1] 3–15 (1989).Google Scholar
[4] Sacks, M.D. and Scheiffle, G.W., “Polymer Adsorption and Particulate Dispersion in Nonaqueous A12O3 Suspensions Containing Poly(vinyl butyral) Resins,” Adv. Ceram., 19 175–84 (1986).Google Scholar
[5] Hoffman, R.L., “Interrelationships of Particle Structure and Flow in Concentrated Suspensions, MRS Bull., 16 [8] 32–7 (1991).Google Scholar
[6] Xue, W. and Grest, G.S., “Shear -Induced Alignment of Colloidal Particles in the Presence of a Shear Flow,” Phys. Rev. Lett., 64 [4] 419–22 (1990).Google Scholar
[7] Napper, D., Polymeric Stabilization of Colloidal Dispersions, Academic Press, 1983.Google Scholar