METHOD OF PRODUCTION OF INGOTS ON BASE OF REFRACTORY METALS BY VACUUM AUTOCRUCIBLE ARC MELTING Russian patent published in 2007 - IPC C22B9/22 C22C14/00 

FIELD: special-purpose electrical metallurgy; production of high-quality ingots from high-temperature alloys on base on titanium alloyed by low-melting elements, for example aluminum, tin and silicon.

SUBSTANCE: burden of low-melting alloying elements is charged into water-cooled copper crucible with skull made from the same alloy in its bottom part; consumable electrode made from parent metal or from alloy is molten into crucible and is poured into ingot mold. Low-melting alloying element charge is loaded on larger base of riser of casting of previous melt made in form of truncated cone whose lesser base is mounted on skull of crucible bottom part; diameter of larger base of riser is preset depending on limits of ratio 0.8≤(d_r/t_cr-4)≤0.9, where d_r is diameter of riser larger base of casting of previous melt, cm; d_cr is diameter of crucible bottom, cm. Ingots produced by this method may be used for plastic metalworking of metals and alloys.

EFFECT: stable high quality of ingots due to chemical homogeneity; low labor input.

2 tbl, 2 ex