Tungsten capacitor anode and process for production thereof
A manufacturing method and capacitor technology, which is applied in the manufacture of electrolytic capacitors, capacitors, electrolytic capacitors, etc., can solve the problems of unresolved leakage current, failure to electrolyze capacitors, insufficient leakage current, etc., and achieve good ESR characteristics
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Embodiment 1～12、 comparative example 1～9
[0058] [Production of sintered body]
[0059] Various tungsten primary powders having the average particle diameters shown in Table 1 were obtained by adjusting the hydrogen concentration when reducing the tungsten oxide powder. Each primary powder was divided into several groups, and after mixing silicon powder with an average particle diameter of 1 μm in each 500 g so as to become 0.5% by mass, in 10 -2 Under Pa reduced pressure, stand at the granulation temperature recorded together in Table 1 for 30 minutes, return to room temperature and use a hammer mill to crush and classify to obtain granulated powder with a particle size of 20-180 μm. Each of the granulated powders was further subdivided into several groups, and using a fine grinding machine TAP-2R, the metal wire was set to a tantalum wire of 0.29mmφ at the molding density (Dg) recorded together in Table 1, and about 20,000 molded bodies with a size of 1.05×1.65×4.63 mm (leads of 8.0 mm are erected on the 1.05×1.65 ...
reference example 1～3
[0067] Adjusting the sodium concentration when reducing potassium tantalate fluoride to produce three types of tantalum primary powders with average particle diameters of 0.5 μm, 0.3 μm, and 0.2 μm, and then obtaining three types of granulated powders at 1320° C. in the same manner as in Example 1 . In the same manner as in the examples, a molding density of 5.6 g / cm was produced from these powders 3 The formed body was further sintered at 1355° C. or higher to obtain each sintered body having the average pore diameter shown in Table 3. Next, a chip-shaped tantalum solid electrolytic capacitor was produced in the same manner as in Example 1, except that the chemical conversion was performed in an aqueous phosphoric acid solution at 65°C, and the post-chemical conversion after polymerization was performed in an aqueous phosphoric acid solution at 65°C. Table 3 shows the average value of 64 capacitors produced in each reference example.
[0068] table 3
[0069]
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