# US 5,705,099 A · Resistive material composition, resistive paste, and resistor

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- Number: US 5,705,099 A
- Document ID: US5705099A
- Status: Granted
- Kind: A
- Application number: 08/633,291
- Filed: 1996-04-16
- Granted: 1998-01-06
- Earliest claimed: 1995-04-18
- Assignees: Murata Manufacturing Co., Ltd.
- Inventors: Keisuke Nagata; Hiroji Tani
- Web page: https://patentgrep.com/patent/US5705099A

## CPC

- H01C 17/06533: {composed of oxides}
- Y10S 428/922: Static electricity metal bleed-off metallic stock
- Y10T 428/29: Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- H01C: RESISTORS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed are a resistive paste that can be fired in a neutral or reducing atmosphere to give a resistor having a high sheet resistivity value and a satisfactory TCR value even on low-temperature-sintering substrates, a resistive material composition that constitutes the resistive paste, and also a resistor that is formed from the resistive paste to realize a high sheet resistivity value and a satisfactory TCR value. A first resistive material of Ca.sub.x Sr.sub.1-x RuO.sub.3 (where x is from about 0.25 to 0.75 mols), a second resistive material of La.sub.y Sr.sub.1-y CoO.sub.3 (where y is from about 0.40 to 0.60 mols) and titanium oxide (TiO.sub.2) are mixed, and a non-reducible glass frit and an organic vehicle are added thereto to form the resistive paste.

## Claims

### Claim 1

A resistive material composition comprising:
a first resistive material of the general formula Ca.sub.x Sr.sub.1-x RuO.sub.3 where x is from about 0.25 to 0.75,
a second resistive material of the general formula La.sub.y Sr.sub.1-y CoO.sub.3 where y is from about 0.40 to 0.60, and
titanium oxide.

### Claim 2 (depends on 1)

The resistive material composition as claimed in claim 1, in which x is about 0.3 to 0.6 and y is about 0.45 to 0.55.

### Claim 3 (depends on 1)

The resistive material composition as claimed in claim 1 containing a non-reducible glass frit, and in which there are from about 1 to 15 parts by weight, relative to 100 parts by weight of the sum of the first and second resistive materials and the non-reducible glass frit, of titanium oxide.

### Claim 4 (depends on 3)

The resistive material composition as claimed in claim 3, wherein the ratio of the first resistive material to the non-reducible glass frit is from about 65:35 to 5:95 by weight.

### Claim 5 (depends on 4)

The resistive material composition as claimed in claim 4, wherein the ratio of the first resistive material to the non-reducible glass frit is from about 60:40 to 9:91 by weight, x is about 0.3 to 0.6 and y is about 0.45 to 0.55.

### Claim 6 (depends on 5)

A resistive paste comprising the resistive material composition as claimed in claim 5 and an organic vehicle.

### Claim 7 (depends on 4)

A resistive paste comprising the resistive material composition as claimed in claim 4 in combination with an organic vehicle.

### Claim 8 (depends on 3)

A resistive paste comprising the resistive material composition as claimed in claim 3 in combination with an organic vehicle.

### Claim 9 (depends on 8)

The resistive paste as claimed in claim 8, in which the resistive material composition comprises from about 4 to 62 parts by weight of the first resistive material, from about 5 to 20 parts by weight of the second resistive material, from about 28 to 90 parts by weight of a non-reducible glass frit and from about 1 to 15 parts by weight of titanium oxide.

### Claim 10 (depends on 8)

A low-temperature-sintering substrate having the resistive paste as claimed in claim 8 thereon.

### Claim 11 (depends on 1)

A low-temperature-sintering substrate having the resistive paste as claimed in claim 1 thereon.

### Claim 12 (depends on 11)

The substrate as claimed in claim 11 in which the low-temperature-sintering substrate comprises from about 15 to 75% by weight of BaO, from about 25 to 80% by weight of SiO.sub.2, 30% by weight or less of Al.sub.2 O.sub.3, from about 1.5 to 5% by weight of B.sub.2 O.sub.3 and from about 1.5 to 5% by weight of CaO.

### Claim 13 (depends on 6)

A low-temperature-sintering substrate having the resistive paste as claimed in claim 6 thereon.

### Claim 14 (depends on 6)

A resistor comprising the fired resistive paste as claimed in claim 6.

### Claim 15 (depends on 7)

A resistor comprising the fired resistive paste as claimed in claim 7.

### Claim 16 (depends on 8)

A resistor comprising the fired resistive paste as claimed in claim 8.

### Claim 17 (depends on 16)

A low-temperature-sintering substrate having the resistor as claimed in claim 16 thereon.

### Claim 18 (depends on 15)

A low-temperature-sintering substrate having the resistor as claimed in claim 15 thereon.

### Claim 19 (depends on 14)

A low-temperature-sintering substrate having the resistor as claimed in claim 14 thereon.