METHOD FOR IMPROVING MECHANICAL PROPERTIES OF HEAVY ALLOY POWDER PRODUCTS BASED ON TUNGSTEN AND POWDER PRODUCT WITH SAID IMPROVED PROPERTIES Russian patent published in 2012 - IPC C22C1/04 B22F3/12 B22F3/105 C22C27/04 

FIELD: metallurgy.

SUBSTANCE: the invention relates to powder metallurgy, in particular, to heavy alloy powder products based on tungsten. The raw piece containing at least 95% of tungsten (rest - nickel and iron with the mass ratio equal to 7:3) is grinded to homogeneous powder mixture with particle size of about 100 nm by high-energy grinding with mechanical activation of the particles. The mass ratio of grinding pellets to raw powder mixture is 10:1. The rough powder pieces are formed by compression in hydrostat with pressure of about 50 MPa and subjected to electric pulse plasma sintering in the solid phase while heating in vacuum at the rate of 100-300°C/minute. The resulting product has the limit of macroelasticity of at least 2000 MPA, the limit of flowability of at least 2500MPA, at the density of ~18,0 g/cm³, and nanodispersed structure with particle size less than 500 nm. The concentration of tungsten atoms in the solid “nickel-iron” solution of γ-phase, based on nickel and doped by tungsten, is increased up to 20,4 %.

EFFECT: improved physical properties of the resulting product.

3 cl, 2 dwg.