Method for producing hafnium ingots by vacuum-arc remelting

摘要

1. A method of producing hafnium ingots, including a vacuum-arc remelting of a consumable electrode, characterized in that the briquettes are pressed from a charge hafnium material with a briquette density of at least ρ = 7.2 g / cm, and a consumable electrode is formed by electron beam welding of briquettes with a power determined by the formula P = k × m, where the proportionality coefficient k = 28-70 W / kg, and the electrode moving speed during welding is not more than 5 mm / s, and the minimum number of welds N is determined by the formula N = 2 + n × D, g e D is the briquette diameter, cm, proportionality coefficient n = 0.1 cm, the first vacuum-arc remelting of the resulting consumable electrode is carried out with the arc current I = K × D, where the proportionality coefficient is Κ = 70-220 A / cm, D- the diameter of the smelted ingot, cm, and then the second vacuum-arc remelting is carried out in a two-stage mode, with the arc current of the first stage I = K × D, where the proportionality coefficient K = 220-350 A / cm, the arc current of the second stage I = K × I, where the proportionality coefficient K = 0.25-0.5.2. A method according to claim 1, characterized in that an electrolytic hafnium powder is used as the charge hafnium material. The method according to claim 2, characterized in that the charge hafnium material additionally contains ground comminuted and / or iodide hafnium.