METHOD OF PRODUCTION OF SINTERED HARD ALLOY ON BASE OF TUNGSTEN CARBIDE AND SINTERED HARD ALLOY PRODUCED BY MEANS OF THIS METHOD (VERSIONS) Russian patent published in 2008 - IPC C22C1/05 B22F3/12 C22C29/08 

FIELD: metallurgy.

SUBSTANCE: invention refers to powder metallurgy, particularly to sintered hard alloys and can be used at production of parts for oil and gas equipment. Powder of tungsten is crushed in benzene medium for 15-30 minutes. Iron as a binding material is introduced by means of rubbing it off steel grinding bodies and walls of a mechanic actuator. Carbon is introduced into alloy by means of extraction from benzene and adding of 1-5 wt % before pressing. 10-20 wt % of nickel at ratio to iron is additionally introduced before pressing to receive non-magnetic hard alloy. Sintering is carried out in vacuum at the temperature of 1250-1300°C during 30-60 minutes. Magnetic hard alloy contains 75-85 wt % of fine dispersed phase WC and 15-25 wt % of α-Fe. Non-magnetic hard alloy contains 70-83 wt % of fine-dispersed phase WC and 17-30 wt % γ-Fe.

EFFECT: produced alloy possesses high hardness at maintaining high durability.

3 cl, 2 ex