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Catalytic effects on carbon/carbon composites fabricated by a film boiling chemical vapor infiltration process

Published online by Cambridge University Press:  31 January 2011

H. Okuno ,
M. Trinquecoste ,
A. Derré ,
M. Monthioux  and
P. Delhaès
H. Okuno
Affiliation:
CRPP/CNRS, Avenue Dr Albert Schweitzer, 33600 Pessac, France
M. Trinquecoste
Affiliation:
CRPP/CNRS, Avenue Dr Albert Schweitzer, 33600 Pessac, France
A. Derré
Affiliation:
CRPP/CNRS, Avenue Dr Albert Schweitzer, 33600 Pessac, France
M. Monthioux
Affiliation:
CEMES/CNRS, 29, rue Jeanne Marvig, 31055 Toulouse Cedex 4, France
P. Delhaès
Affiliation:
CRPP/CNRS, Avenue Dr Albert Schweitzer, 33600 Pessac, France
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Abstract

Chemical vapor infiltration (CVI) has been widely studied under several conditions to obtain C/C composites. A “film boiling technique” (so-called Kalamazoo), by the use of liquid precursor, based on thermal gradient CVI has been recently developed as one of the very effective techniques to increase the carbon yield and the densification rate. A small cold wall type laboratory reactor has been realized to analyze the kinetics of reactions and the deposited pyrocarbon matrix. In this study, ferrocene, as the source of catalyst, is mixed to the liquid precursor to induce a catalytic effect on the film boiling technique since the transition metals are known to increase the carbon deposition rate. In addition to an important increase of the densification rate, it is revealed that the deposition mechanism and microtextures are completely modified by the presence of catalyst, with the presence of multiwall nanotubes within the matrix. A model has been adapted from Allendorff and Hunt's work to interpret this peculiar deposition mechanism.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 1904 - 1913
Copyright
Copyright © Materials Research Society 2002

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