Planetary ball mills can be used for the sample preparation of a wide range of sample materials, with a starting size of 5-10mm, down to a final fineness of <100µm and <1µm. They can also be used to prepare dry powders, suspensions or sample materials under an inert atmosphere. Through the continuous measurement of gas pressure and temperature, it is even possible to investigate mechanical alloying and the production of new materials.
During operation, the grinding bowls rotate around their own axis, whilst orbiting around a central planetary disc. Forces are exerted on the grinding balls and the sample, which are constantly changing direction and energy amount. Optimum grinding ball movements are obtained due to the design geometry and transmission ratios.
The grinding balls are carried up the inner wall of the grinding bowl and propelled off the wall; after crossing the grinding bowl, the balls and the material collide on the opposite side of the grinding bowl wall. The energy developed through the impact is several times higher than conventional ball mills. As a result, excellent grinding results are obtained with much shorter grinding times.