T. Hayashi et al., EFFECTS OF GRINDING AIDS ON THE SURFACE-P ROPERTIES OF FLAKY GRAPHITE, Nippon Seramikkusu Kyokai gakujutsu ronbunshi, 104(3), 1996, pp. 215-220
Dry grinding of raw flaky graphite was carried out using a planetary m
ill in the presence of additives such as tri-sec-butylaluminate, 1H, 1
H, 5H-octafluoropentanol and 1-pentanol. Each of the additives proved
effective in accelerating the size reduction of the graphite, along wi
th in making thin platy particles. The agglomeration of powders and th
e ball coating were not observed during the grinding, indicating that
the additives spread over on all surfaces including the newly born sur
face of the particles resulting in a decrease in surface energy, Fluor
opentanol having a high acidity showed a relatively higher effectivene
ss of grinding aids than 1-pentanol. The function of the aids for thin
ning particles has been explained; i. e., the chemisorption of the add
itive molecules on the broken bond plane of the graphite probably faci
litates the fracture of particles along the cleavage planes.