High-strength and temperature-stable formed bodies of zirconium dioxide

US4900492A · kind A · utility

Assignee

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

Inventors

• Nils Claussen · Schwäbisch Hall, DE
• Helmut Schubert · Stuttgart, DE
• Manfred Ruhle · Ditzingen, DE
• Gunter Petzow · Echterdingen, DE

Key dates

• Filing date: Feb 9, 1988
• Grant date: Feb 13, 1990
• Expiry date: Feb 9, 2008

Classification

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

Abstract

The present invention provides a fine-grained ceramic formed body of 0.5 to mole % rare earth oxide and 0.5 to 7 mole % MgO-containing ZrO.sub.2, wherein the cubic granules thereof are coated with Mg-Al spinel particles. The present invention also provides a process for the production of such formed bodies, wherein a ZrO.sub.2 powder alloyed with rare earth oxide, which contains small amounts of Al.sub.2 O.sub.3, is pressed and sintered in the presence of MgO at a temperature of from 1400.degree. to 1600.degree. C. and optionally subsequently tempered at a temperature of from 1200.degree. to 1350.degree. C.