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. 13, 2012
Filed:
Jun. 08, 2010
Yoshihisa Beppu, Tokyo, JP;
Kazuo Sunahara, Kanagawa, JP;
Yoshihisa Beppu, Tokyo, JP;
Kazuo Sunahara, Kanagawa, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
To provide a process for producing ceria-zirconia solid solution crystal fine particles having high crystallinity, being excellent in uniformity of composition and particle size, having a small particle size and a high specific surface area and being excellent in heat resistance, and such solid solution crystal fine particles. A process comprises a step of obtaining a melt containing, as represented by mol % based on oxides, from 5 to 50% of (ZrO+CeO), from 10 to 60% of RO (wherein R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba) and from 25 to 70% of BO, a step of quenching the melt to obtain an amorphous material, a step of heating the amorphous material at a temperature of from 550 to 1000° C. to precipitate a ceria-zirconia solid solution crystal in the amorphous material, and a step of separating components other than the ceria-zirconia solid solution crystal from the obtained precipitates to obtain the ceria-zirconia solid solution crystal fine particles, in this order.