Silicon-aluminum mixed oxide

US5380687A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Helmut Mangold · Rodenbach, DE
• Werner Hartmann · Hamburg, DE
• Peter Kleinschmit · Hanau, DE
• Dieter Kerner · Midland Park, US
• Thomas Rudolph · Darmstadt, DE

Key dates

• Filing date: Apr 21, 1993
• Grant date: Jan 10, 1995
• Expiry date: Apr 21, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/12
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Silicon-aluminum mixed oxide powder which is flame-hydrolytically produced and has a composition of 65 to 85% by weight Al.sub.2 O.sub.3, remainder SiO.sub.2 and an amorphous structure, in which each primary particle contains components of SiO.sub.2 and of Al.sub.2 O.sub.3, the primary particles are between 7 and 80 nm, preferably 10 and 40 nm in size and the specific surface of the powder is between 20 and 200 m.sup.2 /g. The powder is used for the production of mullite and sintered compacts manufactured from it.