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:
Feb. 27, 2018
Filed:
Dec. 23, 2016
The Doshisha, Kyoto-shi, Kyoto, JP;
Daiichi Kigenso Kagaku Kogyo Co., Ltd., Osaka, JP;
THE DOSHISHA, Kyoto, JP;
DAIICHI KIGENSO KAGAKU KOGYO CO., LTD., Osaka, JP;
Abstract
A ZrO—AlO-based ceramic sintered compact containing tetragonal ZrOparticles having a crystallite size of from 5 to 20 nm as a main component and having an α-AlOcrystallite size of not greater than 75 nm and a relative density of not less than 99% can be produced by preparing a YOpartially stabilized ZrO—AlO-based powder having a molar ratio (mol %) of zirconia (ZrO) and yttria (YO) of from 96.5:3.5 to 97.5:2.5 and a mass ratio (mass %) of ZrOcontaining YOand alumina (AlO) of from 85:15 to 75:25, molding this powder by cold isostatic pressing, and then performing sintering to a high density by microwave sintering for 45 to 90 min in an inert gas atmosphere at 1200 to 1400° C. When performing microwave sintering, a heating rate is preferably from 5 to 20° C./min up to 600° C. and from 50 to 150° C./min at 600° C. or higher.