# US 5,700,418 A · Method of manufacture of components made of sintered indium-tin-oxide solid-solution crystals

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- Number: US 5,700,418 A
- Document ID: US5700418A
- Status: Granted
- Kind: A
- Application number: 08/504,334
- Filed: 1995-07-19
- Granted: 1997-12-23
- Earliest claimed: 1994-07-29
- Assignees: W.C. Heraeus GmbH
- Inventors: Michael Hormann; David Francis Lupton; Jorg Schielke; Friedhold Scholz
- Web page: https://patentgrep.com/patent/US5700418A

## CPC

- C04B 35/457: based on tin oxides or stannates
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

A component made of sintered oxides of indium and tin and a method of manufacturing such a component. The mean size of the oxide particles is larger than 2 .mu.m. The empirical density of the component is more than 95% of theoretical. The component is characterized in that at least 97 weight % of the oxide particles are solid solution crystals with a crystalline matrix of indium oxide. The method comprises molding a green body of a powder of indium-oxide and tin-oxide solid solution and sintering the green body at a temperature less than 1100.degree. C. and preferably between 800.degree. and 1050.degree. C.

## Claims

### Claim 1

A method of manufacturing components from oxides of indium and tin comprising:
molding a green body from particles of a powder, wherein at least 97% by weight of the particles comprise indium-tin-oxide solid-solution crystals with a crystalline matrix of indium oxide, and
sintering the green body at a temperature of 800.degree. to 1100.degree. C., while the green body is compressed hot.

### Claim 2 (depends on 1)

The method as in claim 1, wherein the sintering occurs at a temperature of 800.degree. to 1050.degree. C.

### Claim 3 (depends on 1)

The method as in claim 1, wherein the solid solution of powdered indium oxide and tin oxide crystals is compressed isostatically while it is being sintered.

### Claim 4 (depends on 1)

The method as in claim 1, wherein the Brunauer-Emmett-Teller (BET) surface area of the powder is less than 5 m.sup.2 /g.

### Claim 5 (depends on 4)

The method as in claim 4, wherein the BET surface area of the powder is less than 1 m.sup.2 /g.

### Claim 6 (depends on 1)

The method as in claim 1, wherein the sintering is carried out at a pressure of 50 to 150 MPa.

### Claim 7 (depends on 1)

The method as in claim 1, wherein the sintering is carried out for 2 to 6 hours.

### Claim 8 (depends on 3)

The method as in claim 3, wherein the sintering is carried out at a pressure of 50 to 150 MPa, for a time of 2 to 6 hours and at a temperature of 800.degree. to 1050.degree. C.

### Claim 9 (depends on 5)

The method as in claim 5, wherein the sintering is carried out at a pressure of 50 to 150 MPa, for a time of 2 to 6 hours and at a temperature of 800.degree. to 1050.degree. C.

### Claim 10 (depends on 1)

The method as in claim 1, wherein the sintering is carried out in a reducing atmosphere.

### Claim 11 (depends on 1)

The method as in claim 1, wherein the sintered green body has a density of 7.03 to 7.08 g/m.sup.3.