Abstract:
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 MgAl2O4
spinel which helps in formation of good interface bonding
