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Pall milling is an importanttechnique in powder processing of ceramics. Although small balls as grind ing medium in ball milling give fine powder, the grind ing performance depends on many other milling condi tions, such as combination of ball size, rotation speed and packing volume of balls. In this paper, particle size reduction rate of alumina was studied with respect to the combination of TZP (Tetragonal Zirco nia Polycrystals) ball size and rotation speed. The TZP balls with a geometrical standard deviation of 1.7in log-normal ball size distribution gave the highest rela tive density and the highest particle-size reduction rate. The particle-size reduction rate increased with in creasing rotation speed under the conditions studied.

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