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Processing and Mechanical Properties of SiC-Metal Interpenetrating Composites

Published online by Cambridge University Press:  10 February 2011

Leszek Hozer ,
Yet-Ming Chiang ,
Svetlana Ivanova  and
Isa Bar-On
Leszek Hozer
Affiliation:
Massachusetts Institute of Technology, Dept. of Mat. Sci. & Eng., Cambridge, MA
Yet-Ming Chiang
Affiliation:
Massachusetts Institute of Technology, Dept. of Mat. Sci. & Eng., Cambridge, MA
Svetlana Ivanova
Affiliation:
Worcester Polytechnic Institute, Mat. Sci. & Eng. Dept., Worcester, MA.
Isa Bar-On
Affiliation:
Worcester Polytechnic Institute, Mat. Sci. & Eng. Dept., Worcester, MA.
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Abstract

In this paper we demonstrate a liquid exchange process to introduce a ductile metal reinforcement phase in the amount of 10–30 vol. % into reaction-bonded silicon carbides (RBSCs). Immersion of RBSC in pure Al or Al-Si melts enables diffusional replacement of secondary phase silicon with metal. The Al and Al-Si exchanged composites show improvement in fracture toughness (single edge precracked beam technique) to 6–7 MPa·m1/2 as 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 410: Symposium S – Covalent Ceramics III-Science and Technology of Non-Oxides , 1995 , 423
Copyright
Copyright © Materials Research Society 1996

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References

REFERENCES

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