抄録
An experimental study on the effects of operational conditions on the formation of ultra fine powders was carried out by a reciprocating friction mill with marble as the specimen. The effects of the working speed, the working pressure and the contact area on the production rate of powder were investigated and the following results were obtained.
(1) The effects of the working speed and the working pressure were not significant for the particle size of the powders produced by this mutual friction and abrasion method. The mean particle size was almost constant around the size of 0.2∼0.3μ.
(2) The production rate of powder was greater when the contact area of specimens was smaller.
(3) It seems that the mechanism of abrasion of marble has analogy with the wearing mechanism of metals in consideration of the relation between the mass of produced powder and the working speed. The details have to be experimentally studied from the mechano-chemical point of view.
(4) The mass of the produced powder varied with the working speed and the working pressure when the contact area was constant, and the maximum mass was obtained at the speed of about 6cm/sec and the pressure of 1.5Kg/cm2 in this experiment.
(5) Between the production rate of powder Q and the working pressure P, the relation of Q=cPn was obtained. From the correlation of the index n and the working speed, it seems possible to conjecture the dependence of abrasion mechanisms on the working speed.
