METHOD FOR OBTAINING THE AGGLOMERATED TANTAL POWDER Russian patent published in 2018 - IPC C22B34/24 B22F9/04 B22F9/16 

FIELD: technological processes.

SUBSTANCE: invention refers to the production of the agglomerated condenser tantalum powder that can be used during manufacturing of various types of tantalum capacitors. Heating of the metal tantalum, its hydrogenation in the hydrogen atmosphere during the cooling process with the average rate of 5–20°C/min using sponge titanium hydride as the source of hydrogen are carried out. Mass of the cellular titanium hydride is determined from the following relationship: M_Ti=k⋅M_Ta, where M_Ti – mass of cellular titanium hydride, kg, M_Ta – mass of metallic tantalum, kg, k – empirical coefficient, which is equal to 0.15–0.6. Resulting tantalum hydride is ground, after which the powder is classified and the specified fraction of the tantalum hydride powder is extracted. Isolated fraction is dehydrogenated and agglomerated during heating in the inert gas flow up to the temperature of not more than 1,650 °C, where heating in the temperature range of 500–800 °C is carried out at the speed of 3–10 °C/min. Hydrogen, which is extracted during dehydrogenation, is absorbed by the cellular titanium hydride, which is used during hydrogenation, and it is used in the closed cycle. Resulting sinter is ground in order to obtain the agglomerated tantalum powder.

EFFECT: reduction of 10–40 % in the hydrogenation time of the metal tantalum and the reduction in the carbon impurity content in the agglomerated tantalum powder up to three and one-half times is ensured.

7 cl, 5 ex