Process for the hot isostatic compression of silicon nitride bodies reinforced with carbide fibres and carbide whiskers

US5106793A · kind A · utility

Assignee

• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Peter Greil · Weisendorf, DE
• Klaus-Dietrich Nickel · Frankfurt am Main, DE
• Michael Hoffmann · Gablingen, DE
• Gunter Petzow · Echterdingen, DE

Key dates

• Filing date: Sep 11, 1989
• Grant date: Apr 21, 1992
• Expiry date: Sep 11, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/96
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Carbide fiber- and carbide whisker-strengthened silicon nitride bodies are hot-isostatic pressed without encapsulation of the pressureless pre-sintered formed body at temperature between 1000.degree. and 3000.degree. C. in a nitrogen-protective gas atmosphere. At a low nitrogen partial pressure but high total gas pressure, a maximum consolidation can be achieved already at relatively low temperatures without destruction of the carbide fibers or carbide whiskers.