Process for the production of silicon nitride and product made according to the process

US5114693A · kind A · utility

Assignee

• SKW Trostberg Aktiengesellschaft · DE

Inventors

• Jochen Hintermayer · Trostberg, DE
• Ernst Graf · New Brighton, US
• Werner Gmohling · Hufschlag, DE
• Georg Schroll · Palling, DE
• Wolfgang Kobler · Trostberg, DE

Key dates

• Filing date: May 9, 1991
• Grant date: May 19, 1992
• Expiry date: May 9, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/14
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention provides a process for the production of silicon nitride by the reaction of silicon and nitrogen, wherein, in one reaction step, silicon powder is reacted with nitrogen which continuously rotates at a temperature of from 1000.degree. to 1800.degree. C. and at a pressure of from 1.01 to 1.8 bar up to a nitrogen content of 1 to 39.5% by weight. The present invention also provides a silicon nitride produced by this process wherein it is obtained in porous form and has the following properties. PA1 a) grain size of 0.1 to 20 mm. PA1 b) nitrogen content of 1 to 39.5% by weight, PA1 c) oxygen content of 1%, PA1 d) ratio of .alpha.:.beta.-phase of 1:9 to 9:1.