Process of produciing sintered materials based on Si.sub.3 N.sub.4 /BN using Si-B-N component

US5605871A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Peter Baldus · Burscheid, DE
• Gerd Passing · Wermelskirchen, DE
• Gerhard Wotting · Coburg, DE

Key dates

• Filing date: Jul 3, 1995
• Grant date: Feb 25, 1997
• Expiry date: Jul 3, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B35/597
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the production of sintered materials comprising BN, sintering additives and at least one compound selected from the group consisting of Si.sub.3 N.sub.4 and SiAlON, wherein the BN component is present in the form of crystalline particles with an average particle size <2 .mu.m and the BN content amounts to between 0.1 and 34 vol-%. In the process, a single phase amorphous Si--B--N component with a specific surface <1.5 m/g and optionally Si.sub.3 N.sub.4 -powder is mixed with oxidic and/or nitridic sintering additives to form a mixture, the mixture is formed into a moulded article, and the moulded article is sintered at temperatures in the range from 1,450.degree. C. to 2,100.degree. C. in an atmosphere which contains N.sub..sub.2.