Abstract
Submicron grinding of BaTiO3 powder was studied by a ball mill with small alumina balls of 0.75mmφ to 30mmφ. BaTiO3 clinker which was obtained by calcining equimolar of TiO2 and BaCO3 was preground to 1.8μm. Submicron grinding of the BaTiO3 powder was possible by ball milling with several mmφ balls. In the case of ball diameter of 2mm, the specific surface area was maximum.
An attempt was made to represent the specific surface area in terms of volume per ball and total surface area of used balls, and the following experimental equation with a time term was obtained.
ln(SS)=-0.247lnr3-0.738/r+0.429lnt+1.57 where SS is the specific surface area, r is the ball radius and t is time. The multiple correlation coefficient R was found to be 0.982 when calculated by a computer.
