METHOD OF PRODUCING ELECTRODES FROM NICKEL ALUMINIDE-BASED ALLOYS

摘要

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 CrO, Hf, B and CoOas dopant 13.1–17.9, mixture AlOand NaAlFas 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 m/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. MoOis further added to mixture of dopant, modifying additive used in nanopowder is powder of one of WC, TaC, NbC, ZrO, YO, AlO.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