High-strength and temperature-change resistant ceramic formed body, especially of mullite, its production and use

US4421861A · kind A · utility

Assignee

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

Inventors

• Nils Claussen · Schwäbisch Hall, DE
• Gunter Petzow · Echterdingen, DE
• Richard J. Brook · Stuttgart, DE

Key dates

• Filing date: May 19, 1980
• Grant date: Dec 20, 1983
• Expiry date: May 19, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B35/185
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A ceramic formed body having high temperature change resistance and stren and being composed of a ceramic matrix with dispersed particles of ZrO.sub.2, HfO.sub.2, or mixture thereof, is formed of a powdered ceramic material which is a precursor to the matrix material of the ceramic matrix, mixed with a compound which can form ZrO.sub.2, HfO.sub.2 or mixture thereof upon reaction with the ceramic material, and thereafter densely sintered below the reaction temperature. The sintered body is then heat treated above the reaction temperature to convert the precursor ceramic material into the matrix material and form the ceramic body with in situ formation of the dispersed particles.