Abstract
ABSTRACT Experimental work on impingement casting process of Pb-Zn, Pb-Zn-Sn and Al-Pb systems was carried out. Rapid mixing of immiscible liquid metals was achieved in an arrow-shaped mixing chamber due to vigorous turbulence. The particle size distribution in the castings fitted lognormal curve well. Pb-Zn-Sn system showed the smallest geometric average particle diameter and geometric standard deviation due to low interfacial tension. Various mechanisms of agglomeration were examined and related to the particle sizes. Gravitational sedimentation was shown to be a major parameter governing the agglomeration and hence the final microstructure. The geometric connectivity effect of volume fraction was studied by graphical simulation. When the volume fraction of the dispersed phase was above 30 percent, major portion of the particles were interconnected.
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