Squeeze Infiltration Processing of Functionally Graded Aluminum–SiC Metal Ceramic Composites

The objective of the present work is on fabrication of functionally graded SiC/Al composite by direct squeeze infiltration of 6061 aluminum alloy using graded SiC porous preform prepared by inorganic porogen technique. Graded SiC preform is synthesized by varying the concentration of inorganic salt...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2012-12, Vol.65 (6), p.747-751
Main Authors: Sree Manu, K. M., Resmi, V. G., Brahmakumar, M., Narayanasamy, P., Rajan, T. P. D., Pavithran, C., Pai, B. C.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Corrosion and Coatings
Materials Science
Metallic Materials
Technical Paper
Tribology
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Summary:The objective of the present work is on fabrication of functionally graded SiC/Al composite by direct squeeze infiltration of 6061 aluminum alloy using graded SiC porous preform prepared by inorganic porogen technique. Graded SiC preform is synthesized by varying the concentration of inorganic salt mixture and using Al as the binder. The microstructure analysis indicates the graded distribution of SiC particle and the melt has infiltrated completely throughout the preform to form functionally graded materials. The influence of preform and mold temperature, liquid metal superheat, squeeze pressure, and its rate of application plays major role on solidification microstructures and properties of the composites. The macro porous graded SiC preforms and the composites were characterized using SEM, optical microscopy, and XRD. The major interfacial reaction product is MgAl 2 O 4 spinel which helps in formation of good interface bonding.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-012-0170-5