Colored corundum composite and processes for its production and its use

US5256611A · kind A · utility

Assignee

• H. C. Starck GmbH & Co. KG · DE

Inventors

• Paul Moltgen · Laufenbürg, DE
• Gerhard Winter · Dossenheim, DE

Key dates

• Filing date: Jul 8, 1992
• Grant date: Oct 26, 1993
• Expiry date: Jul 8, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/62
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Colored corundum composite with a matrix of .alpha.-Al.sub.2 O.sub.3, as formed by sol-gel process ending in sintering and size reduction steps with addition of oxide pigments (or precursors of such oxide pigments, formable to the oxide pigment in sinter heating) added to the sol before full gelation thereof.