Kali-chemie Aktiengesellschaft

Solvay Deutschland Gmbh

Wolfgang Habel

Peter Sartori

Lutz Mayer

Baudouin Van Aefferden

Gerhard Roewer

Robin Richter

Hans Meyer

Antonio M Hurtado

Christoph Nover

Hans Kraemer

Thomas Adrian

Bernhard Harnack

Heinz-Peter Judenau

Hans-Peter Martin

Christopher Nover

Andreas Oelschlaeger

Peter Satori

Zeynel Alkan

Hans R Dose

Eberhard Mueller

A process for producing oxygen-free or low-oxygen shaped bodies of silicon carbide, particularly SiC fibers, by using chemically reactive polysilanes and/or polycarbosilanes as precursors. In accordance with the invention green fibers are stabilized preferably in the presence of reactive gases.

Process for producing an oxygen-free or low-oxygen, high-temperature

A binder-containing granulated silicon carbide products for the manufacture of highly dense silicon carbide ceramic products and the SiC ceramic products which can be made from the novel granulated silicon carbide products, especially highly dense SiC high-performance pressurelessly sintered ceramics.

Granulated product composed of silicon carbide powder and silicon

Halogenated polycarbosilanes with uniform or mixed halogenation prepared from aryl-substituted, particularly phenyl-substituted polycarbosilanes by reaction with halogenating reagents under polar or ionic reaction conditions, optionally in the presence of a Lewis acid catalyst. The halogen atom introduced can optionally subsequently be replaced by another halogen atom through a transhalogenation reaction.

Halogenated polycarbosilanes and processes for preparing them

Polycarbosilanes having Si units which are linked by phenyl-substituted methylene bridges or by partially or completely fluorinated hydrocarbon bridges. These polycarbosilanes are obtained by a Grignard polycondensation reaction. If phenyl substituents are present on the silicon atoms of the polycarbosilanes, they may also optionally be exchanged for halogen atoms in additional halogenating reactions, so that polycarbosilanes can be prepared which are both fluorinated on the hydrocarbon bridges and halogenated (particularly fluorinated) on the silicon atoms.

Polycarbosilanes and process for preparing them

Polycarbosilanes in which some of the silicon atoms have been replaced by a hetero element selected from boron, titanium, zirconium, hafnium, etc. The hetero elements are incorporated into the polycarbosilane skeleton in such a way that, like the silicon atoms, they are bonded to the other parts of the polycarbosilanes via hydrocarbon bridges, and the polycarbosilanes are free of hetero element-oxygen-silicon bonds.

Polycarbosilanes containing a hetero element

A process for preparing polycarbosilanes by co-condensation of dihalosilanes R.sup.1 R.sup.2 SiX.sub.2 and saturated dihalohydrocarbons Y-A-Y in the presence of an alkali metal, wherein the groups R.sup.1, R.sup.2, X, Y and A have the meanings given in the claims, and also new polycarbosilanes are described.

Process for preparing polycarbosilanes and new polycarbosilanes

Growing community of inventors

Duesseldorf, Germany

Wolfgang Habel