B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
B22F 9/04 (2006.01) B02C 17/00 (2006.01) B02C 17/04 (2006.01) B22F 9/00 (2006.01) H01F 1/153 (2006.01)
Patent
CA 2066740
2066740 9104810 PCTABS00003 A ball mill for use in mechanical alloying and grinding comprising a plurality of ferromagnetic balls (22) within a spherical or generally cylindrical chamber or cell (20) of a paramagnetic material. The cell has a substantially horizontal axis of rotation (21). At least one magnet (24) is mounted outside the chamber to produce a magnetic field within the chamber. The or each magnet is moveable between a plurality of locations on an arc (25) centred on the axis of rotation of the chamber. In mechanical alloying with a ball mill, the addition of a surfactant to the powder charge within the ball mill modifies the rate and nature of the reaction(s) within the mill. The surfactant should be added in a quantity sufficient to produce a monomolecular layer over the surface of the particles comprising the powder charge, and with an organic solvent, such as hexane. Metallic amorphous materials can be produced using the ball mill of the invention by (a) obtaining amorphous ribbons from a master alloy of the required chemical composition, (b) crystallising the ribbons by annealing at a temperature of about 600 ·C, then (c) milling the crystallised ribbons in a slight overpressure of dry helium to produce a fully amorphous material.
Calka Andrzej
Ninham Barry William
Bereskin & Parr
The Australian National University
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