Submicron grinding of BaTiO3 powder was studied by a ball mill with small balls. The balls used were 2mm and 5mm in diameter, and their specific gravity were 2.77 (glass), 3.33 (TiO2), 3.60 (Al2O3), 3.95 (ZrSiO4), 5.70 (PSZ), and 7.71 (steel). In each case, it was shown that submicron grinding of BaTiO3 powder was possible in short time. The grinding effect of 2mmφ balls was more efficient than that of 5mmφ. The following experimental equation was obtained.
a=0.816ρ+0.569 (2mmφ)
a=0.654ρ+0.316 (5mmφ)
where a is the grinding rate, ρ is the specific gravity.
The concentration of BaTiO3 powder in the slurry was varied from 20 to 50wt%.
The lower the concentration of BaTiO3 powder, the higher the effect of grinding. In the case of low concentration, it was also possible to obtain submicron powder in short time.