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:
Mar. 22, 1994
Filed:
Jan. 05, 1993
Hideki Moriguchi, Hyogo, JP;
Mitsunori Kobayashi, Hyogo, JP;
Toshio Nomura, Hyogo, JP;
Tosiaki Nakamata, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A tool or tool insert is formed of a silicon nitride sintered body which contains silicon nitride as well as a sintering aid and is sintered under a pressurized atmosphere. Freely grown .beta.-Si.sub.3 N.sub.4 including .beta.'-SIALON is removed from its sintering surface by steps other than grinding. A tool of a surface-coated silicon nitride sintered body is formed by coating the surface of a base material, which is formed in a manner similar to the above, with a layer of carbide of Ti or the like having a thickness of 0.1 to 10 .mu.m and/or a layer of Al.sub.2 O.sub.3 having a thickness of 0.4 to 10 .mu.m. Tools or inserts formed by a silicon nitride sintered body and the same tools provided with a surface coating have an excellent wear resistance as well as toughness and can be manufactured at a low cost since grinding is avoided.