Abstract
Factors of milling rates and contamination due to abrasion of balls were investigated in order to obtain ultrafine powder of pure piezoelectric ceramics.
Higher milling rates and lower contamination from balls were obtained for smaller balls. Calcined piezoelectric powders of 1μm in mean particle diameter were milled into the fine powders of 0.2μm for about 7 min. It was estimated that milling rates of this case (0.4 mm PSZ balls) was about 105 times as that of ball mill (ball size 10 mm). Even smaller ultrafine particles of 19 nm in mean particle diameter were obtained by milling for 90 min.
