User Manual

A longer grinding time will increase the fine fraction. To reduce the grinding time you can
use grinding jars and balls with a higher density and therefore with a higher impact energy.
Speed
A higher speed will reduce the grinding time and increase the fine fraction.
Reversing operation (regular reversal of the direction of rotation)
 useful for mechanical alloying
 improves homogenizing of the material
Number and size of the balls
Pregrinding coarse, hard material with large balls.
Use of many small balls will increase the fine fraction if the running time is increased.
Mass of the balls (type of material)
A higher mass (spec. weight) of the grinding balls will accelerate the grinding.
4.3.1 Dry Grinding
Below a particle size of approx. 20 μm, surface forces predominate and the material will
start to "stick".
Further dry grinding can be achieved if surface-active substances are added to the material.
4.3.2 Wet Grinding (Grinding in Suspension)
When grinding in suspension, you can add auxiliary substances in liquid form with a high
boiling point and low vapor pressure.
Flammable liquids with a boiling point <100°C should not be used.
4.4 Clamping the grinding jars
4.4.1 Clamping with the Stainless Steel Jar Fasteners
The following tests should be performed before the grinding jars are clamped in the
machine before each grinding operation:
 The flat sealing gasket (for sealing between the lid and the jar) must not be damaged or
dirty. Replace severely deformed flat sealing gasket.
 The surfaces of the lid and of the jar on which the flat sealing gasket rests must be clean.