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Liquid-exchange processing and properties of SiC–Al composites

Published online by Cambridge University Press:  31 January 2011

Leszek Hozer ,
Yet-Ming Chiang ,
Svetlana Ivanova  and
Isa Bar-On
Leszek Hozer
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Yet-Ming Chiang
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Svetlana Ivanova
Affiliation:
Department of Materials Science and Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609
Isa Bar-On
Affiliation:
Department of Materials Science and Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609
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Abstract

In this paper we demonstrate a novel liquid-exchange process to replace a secondary silicon phase in reaction-bonded siliconized silicon carbides (RBSC's) with a ductile metal reinforcement phase. When RBSC is exchanged with pure Al or Al–Si liquid, secondary phase silicon is dissolved and is substituted by Al or Al–Si alloy. The resulting composites show improvements in fracture toughness (single-edge precracked beam technique), with KIC value up to 8.6 Mpa · m1/2, compared to 3–4 MPa · m1/2 in otherwise similar siliconized silicon carbide. Increased fracture strength (four point flexure) was also observed after the liquid exchange process. The processing furthermore allows the coefficient of thermal expansion to be adjusted, and the thermal conductivity increased, for electronic packaging applications.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 7 , July 1997 , pp. 1785 - 1789
Copyright
Copyright © Materials Research Society 1997

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References

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