A METHOD FOR OBTAINING ELECTRODES FROM ALLOYS BASED ON NICKEL ALUMINIDE

摘要

 The invention relates to obtaining cast electrodes from high alloys based on nickel aluminide and may be used in additive 3D technologies in order to obtain geometrically complicated articles. The method includes obtainment of the semi-finished product through the centrifugal SHS casting with using the reaction mixture containing, wt%: Nickel oxide 47.0-49.1, Aluminum 28.6-32.4, Alloying additive 13.1-17.9, Functional additive 6.5-7.0; a two-stage remelt of the semi-finished with obtaining the refined degassed ingot during the first stage and the electrode from the nanomodified alloy during the second stage, wherein during the said second stage some amount of the master alloy that consists of pressed aluminum and nanopowder mixture with a specific surface area of 5÷30 m2/g and lump aluminum is introduced into the melt before pouring the latter into the crystallizer to ensure the nanopowder content of 0.5-7 vol % in the melt; with its further cooling down to the room temperature and extraction from the crystallizer. The invention is directed to the development of the integrated technology of electrodes made of alloys based on nickel aluminide.