Materials resistant to metal and salt melts, their production and their use

US4755220A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Woditsch · Krefeld, DE
• Werner Kannchen · Duisburg, DE
• Horst Lange · Bochum, DE
• Ingo Schwirtlich · Miltenberg, DE

Key dates

• Filing date: Nov 6, 1987
• Grant date: Jul 5, 1988
• Expiry date: Nov 6, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B35/591
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A material resistant to high temperature melts of metal and salt which comprises a composite material containing silicon nitride, silicon oxynitride, silicon dioxide and silicon prepared by PA0 (a) suspending silicon powder in SiO.sub.2 sol to form a pourable mass, PA0 (b) molding a workpiece from said mass, PA0 (c) hardening the molded workpiece, and PA0 (d) nitriding the hardened workpiece in a nitrogen atmosphere to form silicon nitride and silicon oxynitride to a degree that SiO.sub.2 and elemental silicon remain detectable in the nitrided workpiece, is useful as the material of construction for crucibles and tools for confining, handling and treating melts of metals or salts.