<報文>超微粉砕に対する破壊力学と単粒子破砕からの一考察

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It is generally known that the energy efficiency of a grinding process decreases with an increase in input energy; in batch grinding operations, it ultimately becomes almost zero. In order to produce ultrafine particles, a grinding method has been investigated in this study based on fracture mechanics and single particle crushing. The size reduction energy as the elastic strain energy which is stored in the specimen up to the instant of fracture. Assuming that the kinetic energy of a grinding medium or a particle can be converted completely into fracture energy, the relationship between the impact velocity required to fracture and particle size, or that between the impact velocity of a grinding medium required for a particle to fracture and the mass of a medium have been calculated. Thus, it seems more reasonable to assume that, for ultrafine grinding, a grinding medium collides against a particle rather than that a particle collides against a medium. It is interesting to increase the collision probability because the number of particles produced varies inversely as the cube of particle size. The experimental verification of the above considerations was performed using a ball mill. Ground products smaller than 3μm were obtained in wet ball milling.ultrafine grindingfracture mechanicssingle particle crushingball milling
1989-09-30