Before this trial, the grains, balls and grinding bowl have been placed in liquid nitrogen for embrittlement. The gasket to seal the bowl wasn’t mounted and will not mount in the grinding trial later on (it might embrittle and can be damaged).
After a minute of embrittlement, bowl, grinding balls and sample have been taken out of the liquid nitrogen and the bowl with its filling got assembled and has been fixed to the Mini-Mill PULVERISETTE 23.
After 1 minute of grinding, all grains have been comminuted to < 200 µm.
Longer grinding time might still be possible.