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Improved uniformity of densification of ceramic composites through control of the initial preform porosity distribution

Published online by Cambridge University Press:  31 January 2011

Stanley Middleman ,
Brian Heble  and
Herman C.T. Cheng
Stanley Middleman
Affiliation:
Department of AMES/Chemical Engineering, University of California–San Diego, La Jolla, California 92093
Brian Heble
Affiliation:
Process Analysts, Inc., 3000 Youngfield Street, Lakewood, Colorado 80215
Herman C.T. Cheng
Affiliation:
Engineering Technology Laboratory, E. I. du Pont de Nemours and Company, Wilmington, Delaware 19898
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Abstract

Densification arising from chemical vapor deposition within a porous preform is modeled as a problem in diffusion and reaction. The effect of reaction rate on the nonuniformity of the final densified composite is explored. The possibility of achieving uniform densification by starting with an initially nonuniform porosity distribution is demonstrated with a simulation model. This model permits one to design a densification process from first principles using a simulation tool that yields results on a timescale far less than that of the processing laboratory.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 7 , July 1990 , pp. 1544 - 1548
Copyright
Copyright © Materials Research Society 1990

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References

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