The ceramic material is ground to a specified particle size in a industrial ball mill
apparatus as a result of the impact of the mill body on impact collision and grinding. However, the grinding process of the ceramic raw material in the barrel of the ball mill is very complicated. If a single material particle is used as a research object, it may repeatedly receive the impact collision stress and the grinding extrusion stress during the grinding process of the ball mill
. This causes the existing or newly formed cracks present on the surface of the material particles to expand, thereby forcing the material to plastically deform or break.
When the material particles are continuously ground and crushed by a industrial ball mill
, it is difficult to further grind a certain level of new particles. The main reason is that the cracks on the surface of the newly formed material particles are fine, and the minimum crushing stress required for the expansion of this fine crack is sharply increased. Even if the final crushing stress required to grind the finely divided ceramic raw material in the ceramic ball mill
may increase to force the particles to plastically deform, it is not enough to crush the material, that is, the material particles are no longer finely ground and have been ground too fine.
It can be seen that there is a fineness limit value during the grinding process of the ceramic raw material by the ball mill grinder
. Practical experience shows that if the ceramic raw material is ground by the mill to the certain fineness, the ball grinding mill
will be difficult to grind the material.
The limit of the fineness of the ceramic raw material by the ball mill equipment
depends on the dynamic balance established between the re-agglomeration and the crushing of the finely ground product of the ball mill
. If the lengthening of the ball mill grinding time is too long, it does not make much sense to grind the fine material, and it will only waste energy in vain. This is because the too fine material particles cannot effectively store the elastic deformation energy required to force the crack to expand. The grinding process of the ceramic raw material by the mill is more complicated than the single-grain material ball milling process. It is a composite of finely divided single particles of material, and the crack propagation on the surface of the material particles and the appearance of new cracks will change due to the interaction of each crack. The interaction between the particles and the particles, the interaction between the particles and the abrasive body of the ball mill, the interaction between the particles and the inner liner of the ball mill, and the effect of grinding the finely divided environmental conditions on the particles eventually force the crushing of the ceramic raw material particles - ball milling.