Celanese Gmbh

Hoechst Celanese Corporation

Richard M Arons

Lawrence D David

Robert M Mininni

Ceramic fibers are prepared from improved preceramic fibers having a core comprising an organosilicon preceramic polymer and at least one co-spun sheath layer comprising a synthetic film-forming polymer.

Sheath core spun organosilicon preceramic fibers and processes for

This invention provides a multi-step process for the preparation of ceramic fibers, such as ferrimagnetic spinel fibers which are useful in electromagnetic interaction shielding applications. The process involves subjecting a ceramic powder-filled hollow organic fiber to isostatic pressing, and then pyrolyzing and sintering the compacted fiber to yield a ceramic fiber.

Production of ceramic fibers

This invention provides a process for the preparation of ferrimagnetic spinel fibers composed of crystallites corresponding to the formula:

Ferrimagnetic spinel fibers

This invention provides a spinning process for the preparation of ferrimagnetic spinel fibers composed of crystallites corresponding to the formula:

Production of ferrimagnetic spinel fibers

The present invention provides an improved gel precipitation method for producing a Ni.sub.0.7 Zn.sub.0.3 Fe.sub.2 O.sub.4 type of ferrimagnetic spinel powder which has an average particle size of less than about 1000 angstroms.

Growing community of inventors

Chatham, NJ, United States of America

Richard M Arons