Process for producing sintered .alpha.-Al.sub.2 O.sub.3 bodies and their use

US5665127A · kind A · utility

Assignee

• H. C. Starck GmbH & Co. KG · DE

Inventors

• Paul Moltgen · Laufenbürg, DE
• Pirmin Wilhelm · Bad Säckingen, DE
• Josef Schmoll · Wermelskirchen, DE

Key dates

• Filing date: Jan 24, 1996
• Grant date: Sep 9, 1997
• Expiry date: Jan 24, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K3/1418
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Microcrystalline bodies based on .alpha.-Al.sub.2 O.sub.3 are made by drying sub-micron powders, press compacting and shock sintering at an intermediate sinter temperature range of 1,300.degree. to 1,550.degree. C., i.e. bringing the compact up to such range in under 60 seconds, preferably under 10.