PRODUCTION TECHNIQUE OF A CATHODIC CONDUCTIVE PLATES OF SINTERED-SLUG TANTALUM ELECTROLYTIC CAPACITOR Russian patent published in 2017 - IPC C25D5/00 H01G9/42 

FIELD: electricity.

SUBSTANCE: technique comprises the cathodic tantalum conductive plates surface preparation preliminary to coating process, the voltaic ruthenic coating application to the surface of a conductive plate and the ruthenic coating anodization. Along with this, the conductive plates surface preparation is led by centrifuge test or by cataphoresis for the application of a not agglomerated tantalum powder with the charge-to-mass ratio up to 150000 microcoulomb/gr and middle fraction of 2.5 micron and by following vacuum sintering under a trapped pressure of 10-5 Mmhg, at a temperature of 1050°C within the hour. On completing the sintering the electrolyte ruthenic coating electroplating in thickness of 2.0-4.0 micron is carried out. The electrolyte comprises g/l: Ru(OH)Cl₃ (in terms of the equivalent amount of metal) 5-10; NH₂SO₃H 30 and water that is deionized or distilled to 1 l at a temperature of 60±10°C, at a pressure of 3 volt, cathodic current density of 2-6 ampere per square decimeter, cycle numbers of 4-5 and single cycle time of 10-15 min, and the anodization is carried out in a 38% dipping acid solution.

EFFECT: capacitor volume efficiency and reliability increase while running in the reloading mode over a wide temperature range, leakage current and loss-angle tangent decrease.

2 cl, 8 tbl, 5 ex