METHOD OF OBTAINING SEMI-FINISHED PRODUCT FROM ALLOY ON BASIS OF NIOBIUM Russian patent published in 2019 - IPC C22C27/02 C22B9/20 C22F1/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy and can be used to obtain semi-finished products from niobium alloys. Method involves the preparation of a mixture of oxides of niobium, molybdenum and tungsten in quantities, determined by the grade of the alloy, and aluminum, taken with an excess of 1–15 % of the stoichiometric amount. Aluminothermic reduction is carried out, the obtained ligature is crushed, electron-beam remelting is performed on a plant with a horizontal mold with an ingot, the ingot is first melted on the one hand, cooled, turned over and melted from the other side thereof, then cooled and transferred to the subsequent double or triple electron-beam remelting of the ingot on a plant with a vertically located crystallizer. Then, vacuum-arc remelting of the ingot is carried out on the installation with a consumable electrode with simultaneous introduction of zirconium and carbon into the alloy. Semi-finished product from the ingot is produced by hot and cold pressure treatment with a total deformation of at least 20 % and intermediate annealing.

EFFECT: invention allows to obtain a niobium alloy with high temperature properties.

1 cl, 1 ex