Process for making an indium-tin-oxide shaped body

US6080341A · kind A · utility

Assignee

• W.C. Heraeus GmbH & Co. KG · DE

Inventors

• Bernd Stenger · Hammersbach, DE
• Marek Gorywoda · Hanau, DE
• David Francis Lupton · Gelnhausen, DE
• Wolfram Graf · Essen, DE
• Wolfgang Jablonski · Mettmann, DE

Key dates

• Filing date: May 12, 1999
• Grant date: Jun 27, 2000
• Expiry date: May 12, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B35/622
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for making an indium-tin-oxide shaped body, comprising: (a) filling an indium-tin-oxide powder into a first flexible mold, the indium-tin-oxide powder having a specific BET surface of at most 3 m.sup.2 /g with a mean primary particle size of 0.03 .mu.m to 1.0 .mu.m and/or having a density of at least 40% of theoretical density after cold pressing at a pressure of 100 MPa and/or the indium-tin-oxide powder being made by reacting at least two reaction partners comprising a molten indium-tin-metal alloy as a first reaction partner and oxygen as a second reaction partner in a plasma arc in a plasma chamber provided with an inlet opening for the reaction partners and an outlet with a gas-supply device to obtain a material, and quenching the material at the outlet opening of the plasma chamber with a gas stream which cools the material at a cooling rate of 10.sup.5 K/s to 10.sup.8 K/s to +50.degree. C. to +400.degree. C.; (b) cold pressing the indium-tin-oxide powder at a minimum pressure of 100 MPa; (c) placing the cold compact released from the first mold in a ceramic powder in a second mold, the ceramic powder having a maximum particle diameter of 250 .mu.m, and a melting po…