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Powder Processing and Densification of Ceramic Composites

Published online by Cambridge University Press:  21 February 2011

Fred F. Lange,
David C. C. Lam and
Olivier Sudre
Fred F. Lange
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106
David C. C. Lam
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106
Olivier Sudre
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106
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Abstract

Two issues, packing powder/reinforcement systems and constrained densification, are reviewed. It is shown that pressure filtration has the greatest potential for packing powders containing reinforcements and packing powders within reinforcement preforms. High particle packing is achieved with repulsive interparticle potentials, and for a very small particle to reinforcement diameter ratio. It is now clear that individual reinforcements do not constrain the densification of powders. Shrinkage constraint is caused by a network of either nontouching or touching reinforcements. Network shrinkage (and thus composite shrinkage) caused by powder densification leads to the development of a denser interconnected matrix material surrounding lower density regions. Densification of the lower density regions requires the creep deformation of the denser continuum. As detailed elsewhere in this proceedings, grain growth causes this denser continuum to become more resistant to creep, and coarsening within the lower density regions causes desintering and the dissipation of sintering ‘stresses’. These phenomena do not occur during the densification of glass powders and explains the different densification behavior of crystalline powder matrices relative to glass powder matrices.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 155: Symposium L – Processing Science of Advanced Ceramics , 1989, 309
Copyright
Copyright © Materials Research Society 1989

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References

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