Process for the production of ceramic material containing silicon nitride from polymeric hydridochlorosilazanes

US5075266A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Thomas Gerdau · Eppstein, DE
• Hans-Jerg Kleiner · Kronberg, DE
• Martin Bruck · Hofheim, DE
• Marcellus Peuckert · Hofheim, DE
• Fritz Aldinger · Rodenbach, DE

Key dates

• Filing date: Jul 18, 1989
• Grant date: Dec 24, 1991
• Expiry date: Jul 18, 2009

Classification

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

Abstract

The invention relates to a process for the production of ceramic material containing silicon nitride, such as fibers, coatings or moldings. In this process, polymeric hydridochlorosilazanes are rendered infusible at a temperature below their softening point by treatment with gaseous NH.sub.3 and are then pyrolyzed in an atmosphere containing NH.sub.3 at 700.degree. to 1500.degree. C. Fibers, coatings or moldings containing silicon nitride are produced by first producing appropriate structures from a melt of the polymeric hydridochlorosilazane and then rendering them infusible and pyrolyzing them.