Chapter 14. Ultrasonic Homogenization of Dense Colloidal Suspensions of SiCw/Al2O3 Composites

  1. John B. Wachtman Jr.
  1. K. J. Konsztowicz

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313008.ch14

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

How to Cite

Konsztowicz, K. J. (1990) Ultrasonic Homogenization of Dense Colloidal Suspensions of SiCw/Al2O3 Composites, in A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313008.ch14

Author Information

  1. Atlantic Research Laboratory National Research Council of Canada Halifax, N.S. P3H 3Z1, Canada

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780470374924

Online ISBN: 9780470313008

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Keywords:

  • sedimentation;
  • homogenize;
  • viscosities;
  • ultrasonic;
  • agitation

Summary

The risk of differential sedimentation of the components in the liquid processing of ceramic composites is reduced if the suspensions are dense. It is a common practice to use ultrasonic agitation to homogenize whisker/powder suspensions. However, there is no systematic experimental evidence for the efficacy of this treatment for dense suspensions. Highly concentrated aqueous suspensions of SiC (whiskers)/alumina matrix powder containing 50 vol% (the solids containing 15 vol% whiskers) were subjected to various combinations of power levels and times of ultrasonication. The effect of this treatment on the viscosities of the slurries and the density of green bodies cast from them were determined. These results correlated well with the SEM study of the distribution of SiC whiskers in water suspensions.