# US 7,410,609 B2 · Process for producing capacitors

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- Number: US 7,410,609 B2
- Document ID: US7410609B2
- Status: Granted
- Kind: B2
- Application number: 10/894,256
- Filed: 2004-07-19
- Published: 2005-01-27
- Granted: 2008-08-12
- Earliest claimed: 2003-07-22
- Assignees: H.C. Starck GmbH
- Inventors: Christoph Schnitter
- Web page: https://patentgrep.com/patent/US7410609B2

## CPC

- H01G 9/0525: {Powder therefor}
- C22C 29/12: based on oxides
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

The invention relates to a process for producing capacitors based on niobium suboxide, and having an insulator layer of niobium pentoxide. Also described is a powder mixture suitable for production of capacitors. Pressed bodies produced from the powder mixture, and capacitors having specific properties are also disclosed.

## Claims

### Claim 1

A process for producing capacitor anodes comprising niobium suboxide, said process comprising the following steps in the following order:
(a) first mixing niobium suboxide particles of the formula
NbOx
wherein 0.7<x<2.1,
with at least one valve metal powder to form a niobium suboxide particles mixture wherein said niobium suboxide particles mixture consists essentially of niobium suboxide particles and valve metal powder(s) and said valve metal being a pressing and sintering aid.
(a) pressing niobium suboxide particles mixture to form powder preforms; and
(b) sintering the powder preforms to form porous anode bodies.

### Claim 2 (depends on 1)

The process of claim 1 wherein the valve metal is niobium metal powder.

### Claim 3 (depends on 1)

The process of claim 1 wherein the valve metal and the niobium suboxide particles are mixed in a weight ratio from 0.1 to 2.

### Claim 4 (depends on 1)

The process of claim 1 wherein the valve metal and the niobium suboxide particles are mixed and agglomerated together prior to being sintered.

### Claim 5 (depends on 1)

The process as claimed in claim 1, wherein said niobium suboxide particles mixture consists of niobium suboxide particles and valve metal powder(s).

### Claim 6 (depends on 1)

The process of claim 1 wherein the niobium suboxide is represented by the following formula,
NbOx
wherein 0.7<x<1.3.

### Claim 7 (depends on 1)

The process as claimed in claim 1, wherein x is greater than 0.7 and less than 1.05.

### Claim 8 (depends on 1)

The process as claimed in claim 1, wherein x is greater than 1.0 and less than 1.05.

### Claim 9 (depends on 1)

The process of claim 1 wherein the niobium suboxide is represented by the following formula,
NbOx
wherein 1.3<x<2.1, and
the sintering step is carried out in the presence of hydrogen.

### Claim 10 (depends on 9)

The process of claim 9 wherein the mixture of niobium suboxide and said valve metal has a mean composition represented by the following formula
NbOy
wherein0.7<y<1.3.