Balls from molten ceramic material

The invention involves a molten ceramic ball, it has the following chemical composition is expressed as a percentage by weight (calculated based on the weight of oxides): 40-95% of ZrO2 and HfO2; at least one of Y2O3 and CeO2, provided Y2O3 (present), 0.1-10%,CeO2 (present) 0.1-25% the total 1-15%,Y2O3 and CeO2; when CeO2 is not included, Combination SiO2 10-45%; when combined with CeO2, SiO2 composition for 0.5-45%. molten ceramic ball used for grinding and dispersing in the wet media.