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:
May. 09, 1995
Filed:
Dec. 23, 1993
Chinmau J Hwang, Midland, MI (US);
Donald R Beaman, Midland, MI (US);
David W Susnitzky, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A dense, substantially glass free, SiAlON ceramic material and method of making such material. The material has at least an alpha-SiAlON phase and a beta-SiAlON phase and exhibits excellent high temperature oxidation resistance and strength, good room temperature toughness and hardness, and a density greater than at least 95 percent of theoretical. The method of making the ceramic material is simple and includes adding AlN in an amount sufficient to allow formation of a desired amount of alpha-SiAlON, and in addition, convert SiO.sub.2 and Al.sub.2 O.sub.3 into the beta-SiAlON phase, preferably, by adding AlN in an amount between about 1.3X+0.08Y-0.0045XY and about 1.3X+0.2Y-0.0024XY, wherein X is a weight percent of the SiO.sub.2 based on total weight of the Si.sub.3 N.sub.4 in the mixture and Y is a weight percent of alpha-SiAlON phase desired.