Abstract
The purpose of this work was to study the effect of the cooling rate on the distribution of graphite particles that were desegregated from pellets plunged into aluminium liquid. This method was utilised to overcome the buoyancy of particles and then obtain a suitable distribution of graphite in the ingots, and at the same time, the winnowing of particles outside of the molten while stirring were also avoided. Pellets were a mixture of aluminium powder and graphite particles coated with copper, while the total graphite content could be reasonably fixed at 4·5 wt% for each charge of molten aluminium. The location of graphite particles size was found in an ascending tendency into the ingots obtaining small particles near to the areas of high cooling rates of the ingots while bigger graphite particles were found when a slow cooling rate took place.
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