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:
Dec. 30, 2014
Filed:
Oct. 06, 2009
Keiichiro Suzuki, Niihama, JP;
Masayuki Narumi, Niihama, JP;
Keiichiro Suzuki, Niihama, JP;
Masayuki Narumi, Niihama, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
The invention is to provide a process of producing the powder of aluminum titanate-based ceramics in which the formation of fine particulate component and coarse particulate component is inhibited, and having a very sharp grain size distribution, efficiently and at good yield. The invention is a process for producing a powder of aluminum titanate-based ceramics, comprising a step of keeping a precursor mixture containing a titanium source powder, an aluminum source powder and a silicon source powder at a temperature range of from 1100° C. to 1350° C. for 3 hours or more, followed by a step of heating the precursor mixture up to 1400° C. or more and thereafter firing, at this temperature, the precursor mixture after the keeping to obtain a fired body of aluminum titanate-based ceramics, and a step of pulverizing and classifying the fired body of aluminum titanate-based ceramics, wherein the step of pulverizing and classifying the fired body of aluminum titanate-based ceramics comprises; a step (A) of pulverizing the fired body of aluminum titanate-based ceramics with the application of an impact and classifying the pulverized ceramics to obtain a powder of aluminum titanate-based ceramics having a prescribed grain diameter or less, and a step (B) of re-pulverizing the rest of the pulverized ceramics with the application of an impact and classifying the obtained pulverized ceramics to obtain a powder of aluminum titanate-based ceramics having a prescribed grain diameter or less.