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:
Jul. 04, 1989
Filed:
Feb. 11, 1987
Kazuhiro Inoguchi, Okazaki, JP;
Novuei Ito, Okazaki, JP;
Naochika Nunogaki, Kariya, JP;
Tetsuo Toyama, Anjo, JP;
Nippon Soken, Inc., Nishio, JP;
Abstract
Silicon nitride-alumina composite ceramics composed of silicon nitride crystals, .alpha.-alumina crystals and .beta.'-sialon crystals, wherein the silicon nitride crystals and the .beta.'-sialon surrounded the .alpha.-alumina crystals so as to prevent the connection of the .alpha.-alumina crystals. And a method for producing the silicon nitride-alumina composite ceramics which has the steps of preparing a mixture powder composed of 20 to 70 wt % of alumina powder and silicon nitride powder as a remainder, the average particle diameter of the alumina powder being two or more times as large as that of the silicon nitride powder, and firing the mixture powder in an atmosphere of inactive gas.