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Modelling Transport, Reaction, and Pore Structure Evolution During Densification of Cellular or Fibrous Structures

Published online by Cambridge University Press:  21 February 2011

Stratis V. Sotirchos  and
Manolis M. Tomadakis
Stratis V. Sotirchos
Affiliation:
Department of Chemical Engineering University of Rochester Rochester, NY 14627
Manolis M. Tomadakis
Affiliation:
Department of Chemical Engineering University of Rochester Rochester, NY 14627
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Abstract

A mathematical model is developed to describe mass transport, reaction., and structure evolution during densification of porous media of initially fibrous or cellular structure. The use of Monte Carlo simulation procedures for determining the variation of the local (average) structural properties of the porous structure and of the effective diffusion coefficients in the porous medium with the porosity is also discussed, and results are presented for Knudsen diffusion in cellular or fibrous media. The model is used to theoretically study the transient behavior of the densification process during preparation of SiC/SiC ceramic matrix composites by chemical vapor infiltration (CVI) of porous preforms. Particular emphasis is placed on the investigation of the effects of pressure pulsing on the density gradients in the densifying structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 168 , 1989 , 73
Copyright
Copyright © Materials Research Society 1990

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