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Microwave heated chemical vapor infiltration: densification mechanism of SiCf/SiC composites
journal contribution
posted on 2007-01-23, 09:49 authored by D. Jaglin, J.G.P. Binner, Vaidhy VaidhyanathanVaidhy Vaidhyanathan, C. Pentice, B. Shatwell, D. GrantSilicon carbide fiber-reinforced silicon carbide matrix composites
(SiCf/SiC) have been produced using microwave heated
chemical vapor infiltration. Preferential densification of the
composite from the inside out was clearly observed. Although
an average relative density of only 55% was achieved in 24 h,
representative of an B26% increase over the initial fiber vol%,
the center of the preform densified to 73% of the theoretical.
The densification mechanisms were investigated using X-ray
absorptiometry and scanning electron microscopy. The initial
inverse temperature profile obtained, which was found to result
in the efficient filling of the intratow porosity, although not the
intertow porosity, flattened out after approximately 6 h as the
densification front moved outward toward the edges. Although
not investigated directly, the evidence suggested that this was
caused by changes in both the thermal conductivity and microwave
absorption characteristics as the samples densified.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Pages
1072867 bytesCitation
JAGLIN et al, 2006. Microwave heated chemical vapor infiltration: densification mechanism of SiCf/SiC composites. Journal of the American Ceramic Society, 89(9), pp. 2710–2717Publisher
© American Ceramic SocietyPublication date
2006Notes
This is Restricted Access. This article was published in the journal, Journal of the American Ceramic Society [© Blackwell] and is available at: www.blackwellpublishing.com/jace.ISSN
1551-2916Language
- en