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:
Aug. 07, 1990
Filed:
Aug. 18, 1987
Akiyasu Okuno, Kani, JP;
Masakazu Watanabe, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A composite ceramic material reinforced with silicon carbide whiskers consists essentially of 5 to 45% by weight of SiC whiskers, 3 to 20% by weight of at least one selected from the group consisting of oxides and oxynitrides of zirconium calculated on zirconium, and the balance being a SiZlON-based ceramic substance. The SiAlON-based ceramic substance consists essentially of a substance selected from the group consisting of .beta.-SiAlON represented by a compositional formula of Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z (where 0<z.ltoreq.1) and an .alpha.,.beta.-composite SiAlON made up of said .beta.-SiAlON and an .alpha.-SiAlON of the formula M.sub.x (Si,Al).sub.12 (O,N).sub.16, where M denotes at least one selected from the group consisting of Li, Ca, Mg, Y and rare earth metals and 0<x.ltoreq.2; and 1 to 25% by weight of a glass phase containing therein Zr, Si, Al, O and N, or further at least one selected from the group consisting of Y, Mg, Ca and rare earth metals. This composite material has high strength and toughness suitable for articles requiring high wear and heat resistance such as cutting tools or ceramic valves for internal combustion engines.