Daimler Chrysler Ag

Daimler-benz Ag

Miba Gleitlager Gmbh

Ping Wang

Erwin Schmidt

Martin Hartweg

Silvia Tomaschko

Rolf-Dirc Roitzheim

Walter Gärtner

Arnold Van Zyl

Ingo Borchers

J&uuml;rgen Schnur

Josef Michel

Johann KRÄMER

In a component having vibration-damping properties, a mixture for manufacturing the component, and a method of manufacturing such a component, the component has granular and/or grain- and/or flake-shaped piezoelectric particles which are embedded in a polymer matrix in a proportion of at least 10 volume %. In order to improve the damping effect, at least some of the piezoelectric particles have a polarization which is different from zero.

Component having vibration-damping properties, mixture for manufacturing the component, and method of manufacturing such a component

A superstoichiometric MgAl.sub.2 0.sub.4 spinel, which can be used, for example, as material for a high temperature crucible, is synthesized by, producing a precursor mixture comprising intimately mixed oxides of the corresponding metals in the spinel. Magnesium is added in a superstoichiometric amount to the precursor mixture. Prior to spinel formation, from one to five percent by weight of a reactive salt containing fluorine and/or boron, based on the metal oxides of the spinel, are added to the precursor mixture, and the doped precursor mixture is mixed for from 0.5 to 3 hours. Finally, the mixed precursor mixture is heated for between 0.5 and 4 hours at a temperature between 1150.degree. C. and 1400.degree. C. to synthesize the Mg.sub.(1+x) Al.sub.2 0.sub.4 spinel which is superstoichiometric with respect to magnesium.

Superstoichiometric MgAl.sub.2 O.sub.4 spinel and use thereof, and

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Ulm, Germany

Ping Wang