titanium turnings

As desired, sintered corundum has been used for grinding bowl and balls. We like to mention that the surface of corundum will be very rough and higher abrasion will be found (compared to zirconium oxide which can be used to avoid metal contamination). Also zirconium oxide will have a higher density compared to Al2O3 and achieve the desired fineness much faster.

Because of the bulk density of the turnings, 5 g of sample fill the bowl to the maximum. After 1 minute of grinding, volume collapses and further 5 g of sample can be fed. This has been repeated after 2 minutes of dry grinding.

After 3 minutes of grinding, longest turning pieces which can be found use to have length of max. 8mm.

To reach desired fineness grinding in suspension will be required (see result 2).

After pre grinding in result 1, about 30ml of silicon oil have been added to proceed grinding.

To avoid over pressure, we ground the sample in steps of 5 minutes, followed by a programmed pausing time of 5 minutes. After several cycles, the outside temperature of the bowl should be checked (remain 20 °C below boiling point); grinding time or programmed pausing time might be readjusted afterwards.

After 30 minutes of grinding, fineness has been checked with our Laser Particle Sizer ANALYSETTE 22. The present d50 < 7,6µm use to be finer as desired.

To achieve a better fineness, even longer grinding times are possible as well, as a change in grinding ball size (e.g. 10mm Ø).