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Microwave heated chemical vapor infiltration: densification mechanism of SiCf/SiC composites

journal contribution
posted on 23.01.2007 by D. Jaglin, J.G.P. Binner, Vaidhy Vaidhyanathan, C. Pentice, B. Shatwell, D. Grant
Silicon 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 bytes

Citation

JAGLIN et al, 2006. Microwave heated chemical vapor infiltration: densification mechanism of SiCf/SiC composites. Journal of the American Ceramic Society, 89(9), pp. 2710–2717

Publisher

© American Ceramic Society

Publication date

2006

Notes

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

1551-2916

Language

en

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