Bayer Aktiengesellschaft

Gerd Passing

Hans-Peter Baldus

Hermann-Jens Womelsdorf

Werner Hoheisel

Gerhard Franz

Aloys Eiling

Nils Perchenek

Wolfgang Krumbe

Ralf Riedel

Rolf Meistring

Marc Haltrich

Hannelore Benien

Lothar Sch&ouml;nfelder

Gunter Petzow

A method for the preparation of nano size zinc oxide particles having an average primary particle diameter of less than or equal to 15 nm, which are redispersible in organic solvents and/or water, by basic hydrolysis of at least one zinc compound in alcohol or an alcohol/water mixture. The hydrolysis is carried out with substoichiometric amounts of base, based on the zinc compound. The precipitate which originally forms during hydrolysis is left to mature until the zinc oxide has completely flocculated. This precipitate is then thickened to give a gel and separated off from the supernatant phase.

Nanoparticulate, redispersible zinc oxide gels

The present invention relates to a method for manufacturing transition metal carbides and/or transition metal carbonitrides and the use thereof together with novel transition metal xerogels.

Method for manufacturing transition metal carbides and/or transition metal carbonitrides and use thereof together with novel transition metal xerogels

A process for coating substrates with a silicon-containing protective layer by chemical vapor deposition with a silicon-containing compound of the structural formula (1):

Process for coating substrates with a silicium-containing layer

This invention relates to amorphous fibers containing Si, B and N, to a process for the production thereof and to the use thereof, and to composites containing these amorphous fibers and the production thereof.

Amorphous fibres containing Si, B and N, a process for the production

The present invention relates to a process for the production of sintered materials comprising BN, sintering additives and at least one compound selected from the group consisting of Si.sub.3 N.sub.4 and SiAlON, wherein the BN component is present in the form of crystalline particles with an average particle size &lt;2 .mu.m and the BN content amounts to between 0.1 and 34 vol-%. In the process, a single phase amorphous Si--B--N component with a specific surface &lt;1.5 m/g and optionally Si.sub.3 N.sub.4 -powder is mixed with oxidic and/or nitridic sintering additives to form a mixture, the mixture is formed into a moulded article, and the moulded article is sintered at temperatures in the range from 1,450.degree. C. to 2,100.degree. C. in an atmosphere which contains N.sub..sub.2.

Process of produciing sintered materials based on Si.sub.3 N.sub.4 /BN

The present invention relates to an SiC powder suitable for the production of SiC sintered ceramics with compounds applied to its surface, these compounds being boron nitride and carbon; processes for production of the SiC powders; and the use of these powders to produce SiC sintered mouldings.

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Kö'ln, Germany

Gerd Passing