METHOD OF PRODUCTION OF SINTERED HARD ALLOYS Russian patent published in 2015 - IPC C22C29/08 B22F3/12 

FIELD: metallurgy.

SUBSTANCE: invention relates to the powder metallurgy, namely to the sintered hard alloys, and can be used to manufacture tools. The method of production of sintered hard alloys based on tungsten carbide containing cobalt and nanosize particle of aluminium oxide means preparation of the alloy charge mixture, plastification, granulation, pressing and sintering. The alloy charge mixture is prepared by preliminary mixing of the aluminium oxide in water solution of polyvinyl alcohol by the ultrasound dispersion until suspension production, grinding-mixing of the suspension with grains of the tungsten carbide till creation on its surface of the clad layer, charge addition by cobalt, and further mixing. Plastification is performed in water solution of the polyvinyl alcohol.

EFFECT: increased strength of the hard alloy due to assurance of the more uniform distribution of the nanosize particles over volume of the hard alloy structure.

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