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Metal Casting Technologies : September 2006
57 WHO'S WHO OF METALS -- ANNUAL 2006/7 Figure 8 shows two centrifugal casting pipes. Figure 9 shows the sectioned views of centrifugal casting pipes. Figure 10 shows the close up views of bond between inner and outer layers of the pipes. Figure 11 shows the segregated graphite particles in the casting. PREPARATION OF ALUMINIUM SiC MMC Melt route is employed for preparation the MMC. The aluminium alloy was melted in a graphite crucible and stirred with a graphite stirrer to create a vortex. Graphite is used as stirrer material to prevent the migration of ferrous ions from the stirrer material to the melt. 10 wt % 60 μm SiC particles preheated at 7000C were added in the melt and the melt was stirred for 5 minutes. During stirring small magnesium pieces were added to promote wettability. The melt was later poured into preheated cylindrical split metal mould and preheated fluidity mould. Base metal was processed under same conditions. The casting was machined with carbide tool (depth of cut 1 mm) to determine the wear of cutting tool. Coolant was not used during machining. Flank wear was measured by toolmaker's microscope. MMC materials have improved mechanical and thermal properties but their machinability with conventional tools is poor. The hard ceramic reinforcements cause tool Figure 12. Figure 13.