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

National Research Development Corporation

Rosemount Engineering Company Limited

Richard J Brook

Gunter Petzow

Nils Claussen

Donald N Hunter

Suxing Wu

Zirconia ZrO.sub.2, ceria CeO.sub.2 or thoria ThO.sub.2 may be rendered ionically conductive; a typical composition is ZrO.sub.2 +12 mol % CaO. This is sintered in the solid state as a 40 nm powder using as a sintering additive 0.1 mol % MgO at 1450 C. for 4 hours; a density 98% of the theoretical is achieved. For other fluorite oxide compositions, MgO is also useful as a sintering additive but in different proportions.

Sinterable fluorite oxide ceramics

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.

High-strength and temperature-change resistant ceramic formed body,

Method of detecting oxygen and an oxygen sensor therefor

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Leeds, United Kingdom

Richard J Brook