B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
B22F 9/04 (2006.01) B02C 17/00 (2006.01) B02C 23/18 (2006.01) C01B 21/06 (2006.01) C04B 35/56 (2006.01) C04B 35/58 (2006.01) C04B 35/65 (2006.01) C22C 1/05 (2006.01) C22C 29/02 (2006.01) C22C 29/16 (2006.01)
Patent
CA 2103896
2103896 9214568 PCTABS00015 A nitride of a metal or solid metalloid is produced by ball milling a powder of a metal or metalloid in a nitrogen, or nitrogen-containing atmosphere (such as ammonia). The pressure in the ball mill is normally from 100 to 5,000 kPa, typically about 300 kPa. The ball mill temperature may be from room temperature to 500 ·C, preferably from 200 ·C to 400 ·C. The product powder is normally pressure moulded and annealed at 800 ·C for about 1 hour to produce a strong, hard body. Controlling the degree of nitration, or mixing the product nitride powder with a metal powder before pressure moulding, enables a composite comprising a metal matrix with a dispersed nitride phase to be produced. An alternative technique, involves ball milling the metal or metalloid powder with an organic nitrogen-containing chemical which dissociates in the ball mill. This yields a mixture of the nitride and carbide of a metal or solid metalloid.
Calka Andrzej
Ninham Barry William
Williams James Stanislaus
Bereskin & Parr
The Australian National University
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