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Modeling and Experimental Investigations of Pressure Infiltration of Sol-Gel processed 3-D Ceramic Matrix Composites

Published online by Cambridge University Press:  25 February 2011

Hsien-Kuang Liu  and
Azar Parvizi-Majidi
Hsien-Kuang Liu
Affiliation:
Center for Composite Materials and Department of Mechanical Engineering, University of Delaware, Newark, DE, 19716
Azar Parvizi-Majidi
Affiliation:
Center for Composite Materials and Department of Mechanical Engineering, University of Delaware, Newark, DE, 19716
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Abstract

A parabolic rate kinetics model has been developed and verified by experiments for the pressure infiltration of textile ceramic matrix composites using sol-gel processing with added solid particles. Darcy's law and a global permeability of the whole system were adopted in the model. The permeability of the whole system consisting of fiber preform, compaction, and filter was derived from the individual permeabilities of the fiber preform and particle compaction inside the preform which were based on the Kozeny-Carman equation. Experiments were conducted using 3-D angle interlock woven carbon fiber preforms and silica sol containing silica particles of 0.25μm and 0.5μm sizes. The total infiltration time was inversely proportional to the constant processing pressure and increased significantly with reducing the solid particle size by a factor of two. This is because the permeability of particle compaction layer is the dominant term and it is proportional to the square of particle size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 601
Copyright
Copyright © Materials Research Society 1992

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References

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