METHOD OF PRODUCING ELECTRODES FROM NICKEL ALUMINIDE-BASED ALLOYS Russian patent published in 2017 - IPC B22F3/23 C22C1/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to special metallurgy, in particular to production of cast charge workpieces of electrodes from highly doped nickel aluminide-based alloys, and can be used for centrifugal atomization of electrode material and production of granules for use in addition 3D technologies in order to obtain complex-shape articles from refractory metal materials. Method of producing electrodes from nickel aluminide-based alloy includes production of semi-finished product by centrifugal SHS casting at centrifugal acceleration 60±10 g using a reaction mixture containing, wt%: nickel oxide 47.0–49.1, aluminium 28.6–32.4, mixture Cr₂O₃, Hf, B and Co₃O₄ as dopant 13.1–17.9, mixture Al₂O₃ and Na₃AlF₆ as functional additive 6.5–7.0, and further two-step remelting of semi-finished product to produce at first step a refined degassed ingot, and at second step – an electrode, wherein second step 2–3 minutes before pouring into melt, an ingot is added, consisting of pressed mixture of aluminium with modifying nanopowder with specific surface area 5÷30 m²/g and lumped aluminum, in an amount which provides content in melt of 0.5–7 vol% nanopowder, with further cooling to room temperature and extraction electrode from crystallizer. MoO₃ is further added to mixture of dopant, modifying additive used in nanopowder is powder of one of WC, TaC, NbC, ZrO₂, Y₂O₃, Al₂O₃.

EFFECT: technical result of proposed invention is developing integrated technology of producing electrodes from nickel aluminide-based alloys.

5 cl, 3 ex, 10 tbl, 10 dwg