Max-planck-gesellschaft Zur F&#xf6;rderung Der Wissenschaften E. V.

Gunter Schafer

Werner Weppner

Fritz Aldinger

Andreas Hachtel

Arnold Van Zyl

Use of a boron-containing sinter additive when synthesizing aluminum-oxide ceramics makes it possible to carry out the sintering process at temperatures below 1500.degree. C., which means that ion-conducting aluminum-oxide ceramics can be obtained.

Liquid-phase sintering process for aluminate ceramics

The present invention provides a process for the production of a K- or Rb-.beta.'- or -.beta.-aluminum oxide powder preparation, wherein a cubic densely packed aluminum oxide (.gamma.-aluminum oxide) or a precursor thereof is subjected to attrition together with a doping material or a precursor thereof, the so obtained mixture is calcined in an oxygen-containing atmosphere, potassium oxide or rubidium oxide or a precursor of these compounds is added to the calcination product obtained, the mixture is subjected to attrition and then calcined in an oxygen-containing atmosphere at a temperature greater than 900.degree. C. The present invention also provides a process for the production of a ceramic formed body in which a powder obtained by the above process is converted by attrition, isostatic pressing and sintering into a ceramic formed body. Such a ceramic formed body can be used as an ion conductor.

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Stuttgart, Germany

Gunter Schafer