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The effect of siloxane spin-on-glass and reaction bonded silicon oxycarbide coatings with a self-propagating interfacial reaction treatment (ASPIRE) in the synthesis of carbon/graphite fiber-reinforced aluminum metal matrix composites

Published online by Cambridge University Press:  03 March 2011

Willy M. Balaba ,
Douglas A. Weirauch Jr. ,
Anthony J. Perrotta ,
George H. Armstrong ,
Princewill N. Anyalebechi ,
Suzanne Kauffman ,
Andrew N. MacInnes ,
Angela M. Winner  and
Andrew R. Barron
Willy M. Balaba*
Affiliation:
Alcoa Technical Center, Alcoa Center, Pennsylvania 15069
Douglas A. Weirauch Jr.
Affiliation:
Alcoa Technical Center, Alcoa Center, Pennsylvania 15069
Anthony J. Perrotta
Affiliation:
Alcoa Technical Center, Alcoa Center, Pennsylvania 15069
George H. Armstrong
Affiliation:
Alcoa Technical Center, Alcoa Center, Pennsylvania 15069
Princewill N. Anyalebechi
Affiliation:
Alcoa Technical Center, Alcoa Center, Pennsylvania 15069
Suzanne Kauffman
Affiliation:
Alcoa Technical Center, Alcoa Center, Pennsylvania 15069
Andrew N. MacInnes
Affiliation:
Department of Chemistry and Materials Research Laboratory, Harvard University, Cambridge, Massachusetts 02138
Angela M. Winner
Affiliation:
Department of Chemistry and Materials Research Laboratory, Harvard University, Cambridge, Massachusetts 02138
Andrew R. Barron*
Affiliation:
Department of Chemistry and Materials Research Laboratory, Harvard University, Cambridge, Massachusetts 02138
*
a)Authors to whom correspondence should be addressed.
a)Authors to whom correspondence should be addressed.
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Abstract

Carbon fibers were treated with siloxane spin-on-glass and reaction bonded silicon oxycarbide coatings. The spin-on-glass (SOG) coatings were prepared by pyrolyzing solutions of polymethylsilsesquioxane (PMSO), polydimethoxysilane (PDSO), and poly(ethoxysilane)ethyltitanate copolymer (ESET). Since the flexibility of the coatings was found to be dependent on the concentration of the siloxane solution, only those of PMSO and PDSO below 1.25% were determined to be suitable for fiber coatings, and an alternative approach to the formation of a pliable silicon-based ceramic coating on the fibers was developed. Carbon fiber tows were impregnated by ethanolic solutions of organosilicon chlorides and fired at temperatures up to 900 °C to form a flexible reaction bonded silicon oxycarbide (RB–SiOC) coatings. Uncoated, SOG coated, and RB–SiOC coated carbon fibers were embedded in aluminum metal at 1000 °C. While both silica-based coatings protected the carbon surface, no wetting was observed, leading to fiber pull-out. When the coated fibers were treated with a mixture of Ti and B prior to immersion into the molten aluminum, complete wetting of the fibers occurred. In the presence of molten aluminum, the Ti/B coating enabled the exothermic formation of TiB2 and titanium aluminides, which facilitate wetting. This reaction is termed ASPIRE (Aluminum Self-Propagating Interfacial Reaction) and in combination with silicon-based ceramic coatings provides a scientific approach to the formation of stable carbon fiber/aluminum metal-matrix composites. The coated fibers and composites were characterized by scanning electron microscopy (SEM) with energy dispersive x-ray (EDX) analysis, and x-ray photoelectron spectroscopy (XPS).

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 12 , December 1993 , pp. 3192 - 3201
Copyright
Copyright © Materials Research Society 1993

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