The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 1999
Filed:
May. 14, 1997
Hagen Klemm, Dresden, DE;
Mathias Herrmann, Meissen, DE;
Katja Tangermann, Dresden, DE;
Christian Schubert, Dresden, DE;
Fraunhofer-Gesellschaft, Munich, DE;
Abstract
The invention discloses a dense silicon nitride composite material which may be used as a high-temperature component in building armatures and motors with a long service life and high reliability even at higher temperatures. More specifically, the invention discloses a dense silicon nitride composite material containing 3 to 50 wt. % of a reinforcing component, in which the reinforcing component contains 10 to 90 wt. % Me.sub.5 Si.sub.3 and the remaining portion is either MeSi.sub.2 or MeSi.sub.2 and silicides with other stoichiometries and Me is a metal or a mixture of metals. The present invention is made by a method in which the material is produced by sintering and/or hot pressing and/or hot isostatic pressing and the reinforcing components are added as Me.sub.5 Si.sub.3 and MeSi.sub.2 powder or as a preliminary stage in which, until closed porosity is achieved, a nitrogen pressure/temperature ratio corresponding to a predetermined relationship is maintained which results in the formation and stabilization of Me.sub.5 Si.sub.3.