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. 30, 2013
Filed:
Mar. 11, 2010
Itsuhei Ogata, Okazaki, JP;
Hirofumi Suzuki, Kuwana, JP;
Hiroshi Araki, Oobu, JP;
Yasuki Aoi, Gifu, JP;
Itsuhei Ogata, Okazaki, JP;
Hirofumi Suzuki, Kuwana, JP;
Hiroshi Araki, Oobu, JP;
Yasuki Aoi, Gifu, JP;
Nippon Soken, Inc., Nishio, JP;
Denso Corporation, Kariya, JP;
Abstract
An alumina sintered body comprises alumina crystals as a main phase and a grain boundary phase made up of crystalline YSiOand amorphous SiOat grain boundaries of the alumina crystals wherein when the alumina sintered body is taken as 100 wt %, the high melting phase is present in the range of from 0.1 wt % to 15 wt %. There is also provided a method for preparing the alumina sintered body, which method comprising a first mixing step Pof mixing, at least, a yttria powder having an average particle size of 60 to 100 nm and a silica powder having a given average particle size to provide a mixed slurry and a second mixing step of further mixing an alumina powder having an average particle size of 0.5 to 1.0 μm in the mixed slurry.