Influence of ball size distribution on grinding effect in .
WEBMay 1, 2014 · Fig. 2 shows the operating principle of the planetary ball mill. 250 mL zirconia vials and 8 mm zirconia balls are used and the revolutiontorotation speed ratio k is determined as −2 considering the values reported in many references [13,15–18,23–26]. Fig. 3 shows the detailed geometrical dimensions of the milling vial [32].