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:
Apr. 03, 1990
Filed:
Mar. 30, 1989
Pankaj K Mehrotra, Greensburg, PA (US);
Joyce L Swiokla, Ligonier, PA (US);
Kennametal Inc., Latrobe, PA (US);
Abstract
A method of surface alloying a sialon article containing beta-prime-sialon phase (Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z). The method includes the steps of applying an alumina coating to the surface of the sialon article by chemical vapor deposition and then heat treating the coated article at a temperature between about 1300 and 1800 degrees Centigrade for a time sufficient to diffuse some or all of the aluminum and oxygen from the alumina coating into the sialon composition to produce a layer containing beta-prime-sialon phase having an increased Z value compared to the beta-prime-sialon phase in the remainder of the article.