Process for making nanocrystalline metallic alloy powders by hig

Details Process for making nanocrystalline metallic alloy powders by hig Process for making nanocrystalline metallic alloy powders by hig

1989-08-22

1992-05-12

Roy, Upendra

Specialized metallurgical processes, compositions for use therei

Compositions

Loose particulate mixture containing metal particles

75352, 75354, 148 115P, 148403, 419 23, 419 33, C23C 1000, B22F 100

Patent

active

051123886

ABSTRACT:
There are described metallic powders comprising agglomerated nanocrystals of an electroactive alloy. The main component of the alloy can be of nickel, cobalt, iron or mixtures thereof while the alloying element is one or more transition metals such as Mo, W, V. Preferably the nanocrystals will be made of an alloy of nickel and molybdenum. An electrode which is used by compacting the powders is also disclosed. Also disclosed, is a process for producing the metallic powders by providing particles of nickel, cobalt and iron with particles of at least one transition metal, (Mo, W, V) and subjecting the particles to high energy mechanical alloying such as ball milling under conditions and for a sufficient period of time to produce a nanocrystalline alloy. Electrodes produced from these powders have an electrocatalytic activity for the hydrogen evolution which is comparable or higher than the electrodes which are presently used in the electrochemical industry. Moreover, these materials present an excellent chemical, electrochemical and mechanical stability.

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