Optimum conditions for composites fiber coating by chemical vapor infiltration

A combined analytical and numerical method is employed to optimise process conditions for composites fibre coating by CVI. For a first-order deposition reaction, the optimum pressure yielding the maximum deposition rate at a preform centre is obtained in closed form and is found to depend only on th...

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Bibliographic Details
Published inJournal of the Electrochemical Society Vol. 145; no. 4; pp. 1263 - 1272
Main Authors GRIFFITHS, S. K, NILSON, R. H
Format Journal Article
LanguageEnglish
Published Pennington, NJ Electrochemical Society 01.04.1998
Subjects
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
Technical ceramics
Fiber reinforced material
Chemical vapor infiltration
Deposition rate
Kinetics
Manufacturing
Ceramic materials
Chemical vapor deposition
Composite material
Optimization
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Summary:A combined analytical and numerical method is employed to optimise process conditions for composites fibre coating by CVI. For a first-order deposition reaction, the optimum pressure yielding the maximum deposition rate at a preform centre is obtained in closed form and is found to depend only on the activation energy of the deposition reaction, the characteristic pore size, and properties of the reactant and product gases. Further, this optimum pressure is unaltered by the additional constraint of a prescribed deposition uniformity. Optimum temperatures are obtained using an analytical expression for the optimum value along with numerical solutions to the governing transport equations. These solutions account for both diffusive and advective transport, as well as both ordinary and Knudsen diffusion. Sample calculations are presented for coating preform fibres with boron nitride. 19 refs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1838449