METHOD OF FABRICATION OF TANTALUM POWDER Russian patent published in 2015 - IPC B22F9/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to powder metallurgy. Initial charge is loaded in the tight reactor, the charge contains oxygen or oxygen and oxygen-free tantalum compound and halogenide of alkali metal. In the reactor the inert gas atmosphere is crated, and charge is heated till melt. The alkali metal is injected in the melt during agitation, injection is performed in quantity equal to stoichiometric value with tantalum restoration. After the alkali metal injection to the melt additionally the powder oxygen-free tantalum compound is added, melt is held for 10-40 minutes. Then alkali metal is added in quantity ensuring restoration of the tantalum contained in additionally injected oxygen-free compound. The alkali metal is added by two stages with intermediate melt holding for at least 30 minutes. The obtained reaction mass containing tantalum and halogenide of the alkali metal is cooled, milled and obtained tantalum powder is washed. The obtained powder has smooth surface of particles, and content of alkali metal admixtures is below 1.8×10^-3 wt %.

EFFECT: from powder the anodes of the capacitor with porous anodes and high charge-mass ratio are manufactured, with dissipation coefficient 44,2% maximum and breakdown potential up to 136 V.

5 cl, 1 tbl, 5 ex