Tungsten powder, positive electrode body for capacitors, and electrolytic capacitor

A capacitor and anode body technology, applied in solid electrolytic capacitors, electrolytic capacitors, capacitors, etc., can solve problems such as large leakage current

Inactive Publication Date: 2016-08-03
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] An electrolytic capacitor using tungsten or a sintered body of tungsten powder as the anode body as the valve metal, and an electrolytic capacitor obtained by chemically converting an anode body of the same volume obtained by sintering tantalum powder of the same particle size at the same chemical conversion voltage Compared with capacitors, large capacitance can be obtained, but there is a problem of large leakage current (LC)

Method used

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  • Tungsten powder, positive electrode body for capacitors, and electrolytic capacitor

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Embodiment 1

[0066] In a hydrogen flow, tungstic acid was reduced at 980°C to obtain an average particle size of 0.5 μm and a specific surface area of ​​0.3m 2 / g of coarse powder of tungsten. In this powder, mix 9.6% by mass of commercially available germanium powder (average particle diameter 1 μm) prepared separately, put into a container made of tungsten, and in a vacuum high-temperature furnace with a molybdenum electrode, at 3×10 -4 It was left to stand at 1320° C. for 40 minutes under Pa, then cooled naturally until it became room temperature, and returned to normal pressure. Then, it was crushed with a hammer mill, and sieved with a sieve with an aperture of 320 μm to obtain tungsten granulated powder. The obtained granulated powder had an average particle diameter of 120 μm and a specific surface area of ​​0.2 m 2 / g.

[0067] Elemental analysis of the obtained granulated powder revealed that germanium was 4.8% by mass, oxygen was 0.97% by mass, and other impurity elements were...

Embodiment 2～5 and comparative example 1～3

[0069]Except having changed the compounding quantity of germanium in Example 1, it carried out similarly to Example 1, and obtained the tungsten granulated powder. The average particle diameter and specific surface area of ​​each example are the same as in Example 1. The germanium and oxygen contents of the granulated powders obtained in each example are shown in Table 1, and the other impurity elements were all 350 mass ppm or less.

Embodiment 6

[0071] Commercially available tungsten trioxide powder, 25 times the mass of tungsten trioxide powder (tungsten carbide balls with a diameter of 1mm), and water are charged to the Mitsui Mining Co. , pulverization was carried out at 700° C. for 5 hours under a hydrogen flow.

[0072] After removing the pulverized material, the water was evaporated to obtain an average particle size of 0.3 μm and a specific surface area of ​​2.3 m 2 / g of coarse powder of tungsten. Then, add commercially available germanium powder (average particle diameter 0.2 μ m) so that it is 7.2 mass %, fully mix, put into the decompression high-temperature furnace, at 7 * 10 -4 It was left to stand at 1360° C. for 40 minutes under Pa. During the temperature drop, nitrogen gas was fed into the furnace at 1000° C. so as to become 10 kPa, and maintained for 20 minutes. Finally, after returning to normal pressure with nitrogen gas, it was taken out of the furnace at room temperature. Then, it was crushed ...

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Abstract

The present invention provides a tungsten powder for electrolytic capacitors, which has elemental germanium only in a particle surface region such that the content of the elemental germanium is 0.05-7% by mass, and which has good leakage current (LC) performance. It is preferable that: the tungsten powder has a volume average primary particle diameter of 0.1-1 mumm; the elemental germanium is localized in a region from the particle surface to the position 50 nm deep toward the inside of the particle in each particle; at least one selected from among tungsten silicide, tungsten carbide, tungsten boride and tungsten in which nitrogen is solid-solved is present only in a particle surface region; the content of elemental phosphorus is 1-500 ppm by mass; and the oxygen content is 0.05-8% by mass.

Description

technical field [0001] The present invention relates to tungsten powder, an anode body of a capacitor using the tungsten powder, and an 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, lighter, larger in capacitance, and lower in ESR. [0003] As such a capacitor, it has been proposed to anodize the anode body of a capacitor composed of a sintered body of valve action metal powder such as tantalum which can be anodized, thereby forming a dielectric material composed of these metal oxides on the surface. layers of electrolytic capacitors. [0004] An electrolytic capacitor using tungsten or tungsten powder sintered body as the anode body as the valve metal, and an electrolytic capacitor obtained by chemically converting an anode body of the same volume obtained by si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F1/02B22F5/00H01G9/052B22F1/16
CPCH01G9/052H01G9/0525H01G9/15B22F9/04C22C1/045B22F2009/041B22F2998/10B22F2999/00B22F1/16B22F2207/01B22F9/082B22F1/09B22F1/145B22F3/02B22F3/1007H01G9/042
Inventor 内藤一美光本龙一
Owner SHOWA DENKO KK
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