COMPOSITION OF MIXTURE FOR OBTAINING OF CARBIDE-BASE OR TITANIUM CARBONITRIDE- BASE HARD ALLOY AND HARD ALLOY PRODUCTION METHOD Russian patent published in 1997 - IPC

FIELD: powder metallurgy, in particular, manufacture of wear-resistant and corrosion-resistant parts of friction units and metal working tools. SUBSTANCE: composition of mixture for obtaining of carbide-base or titanium carbonitride-base hard alloy contains powders of titanium-metal alloy and carbon, with metal being of iron group, powders of carbide and/or nitride of metal of Va,VIa groups. Components are used in following amounts, wt.-%: titanium-metal alloy, 79-88; carbide and/or nitride of metal of Va,VIa groups, 1.5-12.8; carbon the balance. The recited ratio of components allows content of high-melting temperature phase in final alloy to be increased and, as a result, hardness of alloy to be improved. Moreover, uniform small-grain structure is provided to improve wear-resistance of alloy. Corrosion-resistance and wear-resistance are increased by introducing metal of Va,VIa groups into the mixture. Method involves grinding mixture of powders in shielding atmosphere; separating, drying, sieving; charging mixture into die-mold; heating in shielding atmosphere; hot pressing and cooling. Die-mold with powder is preliminarily heated to temperature of 200-400 C to provide for exit of adsorbed gases and moisture, pressure of 5-50 MPa is applied to powder through punches and heating at heat rate of 50-200 C/min to melting temperature of titanium-metal alloy is conducted. Upon compaction of alloy, heating process is stopped. As a result of conducting the process at temperature of up to 1,100 C, uniform alloy structure is formed with size of grain of high-melting temperature phase of up to 1 micron. EFFECT: increased efficiency and improved quality of alloy by increased uniformity of grain structure, efficient corrosion and wear resistance. 3 cl, 3 tbl