Polysilazanes, process for the preparation thereof, silicon, nitride-containing ceramic materials which can be prepared therefrom, and the preparation thereof

US5084423A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Tilo Vaahs · Kelkheim, DE
• Hans-Jerg Kleiner · Kronberg, DE
• Marcellus Peuckert · Hofheim, DE
• Martin Bruck · Hofheim, DE
• Fritz Aldinger · Rodenbach, DE

Key dates

• Filing date: Mar 30, 1990
• Grant date: Jan 28, 1992
• Expiry date: Mar 30, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B35/589
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to novel polysilazanes, the preparation thereof, the further processing thereof to form silicon nitride-containing ceramic material, and this material itself. In order to prepare the polysilazanes, dialkylaminoorganyldichlorosilanes of the formula RSiCL.sub.2 --NR'R' are reacted with ammonia. The polysilazanes can then be pyrolyzed to form silicon nitride-containing ceramic material. The polysilazanes according to the invention dissolve in customary aprotic solvents.