Method for producing capacitor

摘要

A capacitor having at least an anode body composed of a tungsten sintered compact and having less leakage current under high-voltage conditions and less variation in leakage current values, obtained by a production method including the steps of: compacting a tungsten powder to obtain a compression body; firing the compression body to obtain an anode body; applying voltage to the anode body, which is used as an positive electrode, in an alkaline fluid; chemically converting the surface layer of the anode body into a dielectric; optionally removing water from the anode body; and heat-treating the anode body, whose surface has been chemically converted into a dielectric, at a temperature of 100° C. or more and 260° C. or less.

主权项

1. A method for producing a capacitor, in which the method comprises the steps of:
(1) applying voltage to a tungsten anode body, which is used as a positive electrode, in an alkaline fluid; (2) chemically converting the surface of the anode body treated in the step (1) into a dielectric layer; and (3) heat-treating the anode body treated in the step (2) at a temperature of 100° C. or more and 260° C. or less.