FIELD: technological processes.
SUBSTANCE: present invention relates to a method of reducing primary powder of valve metals and tantalum powder, suitable for use as anode material for electrolytic capacitors. The powder of valve metals is reduced by reducing metals such as aluminium, magnesium, calcium, barium and/or lanthanum and/or their hydrides, in an atmosphere of an inert carrier gas. Reduction is carried out without contact between the reduced powder of valve metals and the liquid reducing metal/metal hydride. The powdered metal and reducing metal/metal hydride are put into a reactor in different places so that the reducing metal/metal hydride can reach the powdered metal only in vapour form. Tantalum with specific surface area of 4-8 m2/g is pressed to density of 5 g/cm3 and sintered at 1210°C for 10 minutes. The obtained anode is formed at formation anode of up to 10 V has specific capacitance of 220000-350000 mcFV/g. Tantalum powder with specific surface area of 3.5-6 m2/g is pressed to density of 5 g/cm3 and sintered at 1210°C for 10 minutes. The obtained anode which is formed at formation voltage of up to 10 V has specific capacitance of 180000-250000 mcFV/g.
EFFECT: reduced aggregation of primary structures, high specific capacitance of capacitors made from the prepared powder.
21 cl, 5 dwg, 4 tbl, 12 ex
