High-strength ceramic composite, process for its preparation and its use

US5139717A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

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

Key dates

• Filing date: Nov 30, 1989
• Grant date: Aug 18, 1992
• Expiry date: Nov 30, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B41/87
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a high-strength ceramic composite, in particular made from silicon nitride, a process for its preparation and its use. The process comprises impregnating an open-pore matrix with a molten polysilazane in a first step and, in a second step, heating the impregnated matrix to 800.degree. to 2500.degree. C. under a blanketing gas, such as nitrogen or a noble gas, or to 800.degree. to 1500.degree. C. under a gas containing ammonia. The high-strength ceramic composite prepared can be used as a component to be subjected to high thermal, mechanical or corrosive stress.