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Tape Casting Using Fine Ceramic Powders

Published online by Cambridge University Press:  25 February 2011

David S. Wilkinson ,
Evin P. Plucknett  and
Carlos H. Caceres
David S. Wilkinson
Affiliation:
Dept. of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, CANADA.
Evin P. Plucknett
Affiliation:
Dept. of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, CANADA.
Carlos H. Caceres
Affiliation:
Dept. of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, CANADA.
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Abstract

Tape casting technology has been developed for the production of ceramic composites using fine powders of alumina and zirconia with an average particle size in the range 0.25-0.3 μm. These powders require careful control of the dispersant/solids ratio in order to minimize the slip viscosity, and to prevent the rejection of excess dispersant during solvent evaporation. In this regard phosphate ester has been found to be an effective dispersant. The choice of solvent is also important, with a non-polar solvent exhibiting more forgiving behaviour. The use of such fine powders lowers the solids loading permitted in the tape casting slip to about 22 vol.%, with a resulting green density of less than 54% of theoretical. However, high sintered densities can be achieved in both single tapes and laminates. Constraints imposed on the tape during solvent evaporation lead to a difference in green density within the tapes, and strategies need to be developed to counteract this.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 249: Symposium Q – Synthesis and Processing of Ceramics: Scientific Issues , 1991 , 305
Copyright
Copyright © Materials Research Society 1992

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References

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