Process for production of silicon nitride material

US5384081A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerhard Wotting · Coburg, DE
• Martin Knoch · Starnberg, DE
• Klaus Kramer · Landau, DE

Key dates

• Filing date: Sep 24, 1993
• Grant date: Jan 24, 1995
• Expiry date: Sep 24, 2013

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16C33/30
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the production of a dense Si.sub.3 N.sub.4 material by normal pressure sintering of mouldings which have been manufactured from mixtures of Si.sub.3 N.sub.4 powders and sintering additives without being embedded in a powder packing and are sintered at temperatures of 1775.degree. C.+-. 75.degree. C.