Hoechst Aktiengesellschaft

Hans-Michael Guther

Andreas Roosen

Christine Kostler

Christian May

Friedrich Hessel

Katharina Seitz

Rainer Buckpesch

Katherina Seitz

Frank Schroder

A process is proposed for producing non-oxidic ceramic having a thermal conductivity in a predetermined range. A shaped body of non-oxidic ceramic material is heated to remove organic constituents, and is subsequently thermally treated in an oxygen-containing atmosphere to incorporate oxygen atoms into the crystal lattice of the non-oxidic ceramic, with the temperature and/or the hold time at this temperature being selected as a function of the predetermined thermal conductivity range, and the shaped body is finally sintered in a non-oxidizing atmosphere.

Process for producing non-oxidic ceramic having a defined thermal

A water sensitive ceramic powder, in particular aluminum nitride, is provided with a hydrophobic coating. The coated powder is dispersed in water with addition of a binder and a nonionic surfactant from the group comprising ethylene oxide adducts with an HLB value of from 10 to 14. Subsequently the aqueous slip is converted into a free flowing granulated powder. The nonionic surfactant, which is added in an amount sufficient to give a monomolecular layer, makes possible a good dispersion of the hydrophobically coated powder in water.

Process for converting water sensitive ceramic powders into a free

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Kelkheim/Taunus, Germany

Hans-Michael Guther