Temperature stabilized silicon dioxide-mixed oxide, the process for its production and use

US4297143A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Peter Kleinschmit · Hanau, DE
• Rudolf Schwarz · Alzenau, DE

Key dates

• Filing date: Jul 31, 1980
• Grant date: Oct 27, 1981
• Expiry date: Jul 31, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/129
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is prepared pyrogenically produced silicon dioxide-mixed oxide having a BET surface area of 50 to 400 m.sup.2 /g which contains as a constituent of the mixed oxide: PA0 0.01 to 10 weight % zirconium dioxide or PA0 0.01 to 10 weight % iron oxide (ferric oxide) or PA0 0.01 to 9.9 weight % titanium dioxide. Because of the doping with the foreign oxide the silicon dioxide-mixed oxide is more temperature stable than the undoped silicon dioxide. The product can be used as thermal insulation either as unpressed material in free bulk form or as a compacted mixture.