250 ml grinding bowl made of silicon nitride (Si3N4)
+ 15x 20 mm ø silicon nitride grinding balls
Feed quantity:
150 g
Feed Size:
< 20 µm
Additive:
+ 60ml water
Grinding time:
60 min
Final fineness:
100% < 1.5 µm
Comments:
To avoid overpressure, we ground the sample in steps of 5 minutes, followed by a programmed pausing time of 10 minutes. After several cycles, the outside temperature of the bowl should be checked (remain below 80°C); grinding time or programmed pausing time might be readjusted afterwards.
After totally 60 minutes of grinding time, fineness has been checked with our Laser Particle Sizer ANALYSETTE 22 Compact. No particles > 1,5µm could be found afterwards.
Surely a usage of smaller grinding balls (e.g. now available 10mm Ø; optimal with 1mm Ø zirconium oxide) will be much faster in grinding.