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:
Feb. 19, 1985
Filed:
Mar. 11, 1980
Werner Huther, Karlsfeld, DE;
Motoren-Und Turbinen-Union Munchen GmbH, Munich, DE;
Abstract
A blank is molded from a powdery mixture of silicon, .alpha.-silicon nitride, and a sintering agent. The blank is nitrided to nitride the silicon content of the blank, and thereafter the blank is subjected to hot isostatic pressing. The silicon content of the original powdery mixture is between 5% and 60% by weight of the mixture, and the sintering agent, which may be an oxide, is present in the original powdery mixture in the range between 0.1% and 10% by weight. The nitriding is carried out in a nitrogen atmosphere at a temperature between 1100.degree. C. and 1600.degree. C. The nitriding may be carried out in two stages, first at a temperature between 1050.degree. C. and 1400.degree. C., and then at a temperature above the melting point of silicon.