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Sol-gel coatings to improve processing of aluminium matrix SiC reinforced composite materials

Published online by Cambridge University Press:  03 March 2011

J. Rams ,
M. Campo  and
A. Ureña
J. Rams
Affiliation:
Department Tecnología Química, Ambiental y de los Materiales, ESCET, Universidad Rey Juan Carlos, C/ Tulipán s/n, Móstoles 28933 Madrid, Spain
M. Campo
Affiliation:
Department Tecnología Química, Ambiental y de los Materiales, ESCET, Universidad Rey Juan Carlos, C/ Tulipán s/n, Móstoles 28933 Madrid, Spain
A. Ureña
Affiliation:
Department Tecnología Química, Ambiental y de los Materiales, ESCET, Universidad Rey Juan Carlos, C/ Tulipán s/n, Móstoles 28933 Madrid, Spain
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Abstract

This paper analyses the influence of the inner structure of a SiO2 coating deposited on SiC particles by a sol-gel route on reactivity and wettability between SiC particles and molten aluminium during composite manufacturing. Different heat treatments were applied to the sol-gel coatings to change the porous structure of the amorphous silica. The coatings subjected to the mildest heat treatment were more reactive with molten aluminium, enriching the Si content of the matrix composite, and hence inhibiting direct reaction of the SiC particles and the formation of aluminium carbide. Thermal analysis showed that Si enrichment altered the solidification behavior of the aluminium matrix and its resultant microstructure, influencing the manufacturing conditions and final properties of the fabricated composites.

Keywords

CompositesCoatings
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 7 , July 2004 , pp. 2109 - 2116
Copyright
Copyright © Materials Research Society 2004

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References

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