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Positive electrode body for tungsten capacitors

A kind of anode body and capacitor technology, applied in the direction of capacitor electrodes, capacitors, electrolytic capacitors, etc., can solve the problems of difficult to use capacitors, large capacitance changes, etc., and achieve the effect of low bias voltage dependence

Inactive Publication Date: 2016-08-10
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the above-mentioned valve action metals, the electrolytic capacitor with tungsten powder sintered body as the anode body, compared with the electrolytic capacitor with aluminum foil as the anode body, and the electrolytic capacitor with tantalum powder and niobium powder sintered body as the anode body, Capacitance variation (bias voltage dependence) with respect to DC voltage is extremely large, and there is a problem that it is difficult to use it in circuits for precision equipment that require small fluctuations in capacitor capacitance

Method used

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  • Positive electrode body for tungsten capacitors
  • Positive electrode body for tungsten capacitors
  • Positive electrode body for tungsten capacitors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5、 comparative example 1～4

[0051] Commercially available tungsten powder with a volume average particle size of 0.65 μm was placed in a vacuum furnace at 1400°C for 30 minutes and then taken out to room temperature. of granulated powder. The powder was formed by using a molding machine to plant a tantalum wire with a diameter of 0.29 mm, and then sintered in a vacuum furnace at 1470 ° C for 20 minutes to produce 1,000 tantalum wires with a size of 1.0 mm × 3.0 mm × 4.4 mm (mass: 120mg, tantalum wire penetrates 3.4mm in the center of the 1.0mm×3.0mm surface and protrudes 6mm to the outside). Using 3% by mass of ammonium persulfate aqueous solution as a chemical conversion solution, chemical conversion was carried out for 5 hours at an initial current density of 2mA, a voltage of 10V, and a temperature of 50°C per sintered body. A dielectric layer is formed. Washing was performed with water, followed by ethanol washing, and heat treatment was performed in the air atmosphere under the heat treatment cond...

Embodiment 6～10、 comparative example 5～7

[0056] In Example 1, 0.4% by mass of commercially available silicon powder with an average particle diameter of 1 μm was mixed with commercially available tungsten powder, and granulated powder was produced at 1450° C., and the sintering temperature was set at 1540° C., using 4 mass Sintering and chemical conversion were carried out in the same manner as in Example 1, except that the aqueous solution of potassium persulfate was chemically converted at 40° C. with an initial current density of 5 mA per sintered body and a voltage of 15 V. For the chemically converted heat-treated sintered body (anode body), capacitor capacitance was measured under application of bias voltages of 0V, 2V, and 3V. Table 2 shows the average value of 30 samples for each example.

[0057] Table 2

[0058]

[0059] 2) Expressed by the number of hydrated water molecules relative to 10 tungsten trioxide compound molecules

[0060] According to the results of Table 1 and Table 2, the process shown in...

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Abstract

The present invention provides a positive electrode body for electrolytic capacitors, which is obtained by sintering a tungsten powder into a sintered body and subjecting the sintered body to chemical conversion, thereby forming a dielectric layer composed of a tungsten trioxide compound on the surface of the sintered body, and which is characterized in that the ratio of hydration water in the tungsten trioxide compound is one molecule or less per 10 molecules of the tungsten trioxide compound. A tungsten capacitor which is reduced in the capacitance change due to DC voltage (bias dependence) can be produced using a positive electrode body according to the present invention.

Description

technical field [0001] The present invention relates to capacitor anode bodies comprising tungsten sintered bodies. More specifically, it relates to an anode body of a tungsten capacitor having reduced capacitance variation (bias voltage dependence) with respect to a direct current (DC) voltage, and a solid electrolytic capacitor using the anode body. Background technique [0002] As electronic devices such as mobile phones and personal computers become smaller, faster, and lighter in weight, capacitors used in these electronic devices are required to be smaller and lighter, have higher capacitance, and lower ESR. [0003] Solid electrolytic capacitors, for example, use aluminum foil or a conductor (anode body) composed of a sintered body of valve action metal powder such as tantalum, niobium, and tungsten as one electrode, and the one electrode, a dielectric layer, and the other electrode (semiconductor layer) The dielectric layer is a dielectric layer of a metal oxide for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/04H01G9/00H01G9/052
CPCH01G9/15H01G9/0032H01G9/052H01G9/0525H01G9/07
Inventor 内藤一美光本龙一
Owner RESONAC HOLDINGS CORPORATION
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