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Valve acting metal sintered body, production method therefor and solid electrolytic capacitor

A technology of solid electrolysis and manufacturing methods, which is applied in the direction of solid electrolytic capacitors, electrolytic capacitors, capacitors, etc., and can solve the problems of cathode material soaking and inability to manufacture capacitors, etc.

Inactive Publication Date: 2006-08-02
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the sintered element cannot be saturated by the cathode material and cannot fabricate a capacitor with high capacitance and low ESR

Method used

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  • Valve acting metal sintered body, production method therefor and solid electrolytic capacitor
  • Valve acting metal sintered body, production method therefor and solid electrolytic capacitor
  • Valve acting metal sintered body, production method therefor and solid electrolytic capacitor

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Embodiment approach

[0194] The present invention will be described in more detail below with reference to Examples and Comparative Examples, however, the present invention is not limited thereto. In each example, the tap density, angle of repose, particle size, pore diameter and capacitance, leakage current value, capacitance realization rate, and moisture resistance of the capacitor were measured by the following methods.

[0195] (1) Porosity of sintered body

[0196] The bulk density of the sintered body is determined by the external size and mass of the sintered body, the real density of the sintered body is measured by a pycnometer, and the porosity of the sintered body is calculated according to the following formula:

[0197] Porosity (%)={1-(bulk density / true density)}×100

[0198] (2) Particle size measurement

[0199] The particle size distribution was measured according to the laser diffraction scattering method using a particle size distribution analyzer (HRA 9320-X100, manufactured...

Embodiment 1

[0230] Dissolve 500 g of camphor in 10 ml of toluene at room temperature. In the resulting solution, 8.4 kg of niobium hydride powder having an average particle size of 0.5 microns obtained by grinding niobium hydride, 800 g of barium oxide powder having an average particle size of 0.7 microns, and 800 g of barium oxide having an average particle size of 2 microns Powder dispersed. The resulting dispersion was mixed in a Dynomill using zirconia beads for 1 hour. The resulting slurry was added to a Nauter mixer and granulated while at 1 x 10 2 Dry under reduced pressure at Pa and 80° C. to obtain a granular product containing a mixture of niobium hydride, barium oxide and camphor and having an average particle size of 120 microns. in 1×10 2 The mixed granulated product was dehydrogenated at 480°C under a reduced pressure of Pa or lower, whereby niobium hydride was converted into niobium, and camphor was simultaneously removed to obtain 10 kg of a mixture containing niobium a...

Embodiment 2 to 4

[0238] A niobium sintered body embedded with a niobium lead was obtained in the same manner as in Example 1, except that before forming (Example 2), after forming but before sintering (Example 3), or after sintering but after removing the barium oxide Previously (Example 4) nitriding treatment was performed at 300° C. for 2 hours in a nitrogen atmosphere. 100 elements of various sintered bodies were prepared and electrochemically generated at a voltage of 20 V for 600 minutes using a 0.1% phosphoric acid aqueous solution to form an oxide dielectric film on the surface. Chip capacitors were manufactured from these electrochemically produced niobium anode sintered bodies using capacitor manufacturing method 1, 2, or 3. The physical properties of each sintered body and the capacitance realization rate and electrical performance of each capacitor are listed in Tables 1 to 3.

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Abstract

The invention provides a valve-acting metal sintered body for anode of a solid electrolytic capacitor, having a high capacitance, well impregnated with cathode material, and exhibiting excellent properties particularly when having a large volume, a capacitor having a low ESR, an excellent tan delta value and good long-term reliability such as moisture resistance and heat resistance by using the sintered body, and a production method therefor comprising the following steps: coating / printing / shaping a granulated product of a mixed dispersion containing a pore-forming agent, an organic binder and a primary powder or secondary aggregated powder of at least one member selected from valve-acting metal, a valve-acting metal compound and a valve-acting metal alloy or a granulated powder thereof, and a solvent, or compressing and shaping the granulated product of a mixture obtained by removing the solvent from the dispersion; sintering the shaped article containing a pore-forming agent; and removing the pore-forming agent from the sintered body.

Description

[0001] Cross References to Related Applications [0002] This application is filed under 35U.S.C.Section 111(a), which requires a U.S. provisional application filed May 2, 2003 under 35U.S.C.111(b) under 35U.S.C.Section 119(e)(1) Right to Serial No. 60 / 467,152. technical field [0003] The present invention relates to a method for producing a sintered body of a valve-acting metal used as an anode of a solid electrolytic capacitor, and to a solid electrolytic capacitor using the sintered body as an anode. More specifically, the present invention relates to a method for producing a niobium or tantalum sintered body used as an anode having a high capacitance per unit mass, in which method using niobium, niobium compound, niobium alloy, tantalum, tantalum compound or tantalum alloy The powder is used as a valve metal, and the present invention also relates to a solid electrolytic capacitor using the sintered body as an anode. Background technique [0004] Capacitors used in el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/052H01G9/042
CPCH01G9/052H01G9/028B22F3/1125C22C1/08C22C27/02C22C29/00H01G9/042H01G9/0525H01G9/15Y02E60/13
Inventor 大森和弘涩谷义纪
Owner RESONAC HOLDINGS CORPORATION
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