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:
Jun. 11, 2019
Filed:
Mar. 01, 2017
Applicant:
Ngk Insulators, Ltd., Nagoya, JP;
Inventors:
Kiyoshi Matsushima, Nagoya, JP;
Morimichi Watanabe, Nagoya, JP;
Kei Sato, Tokai, JP;
Tsutomu Nanataki, Toyoake, JP;
Assignee:
NGK Insulators, Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 35/115 (2006.01); C04B 35/645 (2006.01); C01F 7/44 (2006.01); C04B 35/626 (2006.01);
U.S. Cl.
CPC ...
C04B 35/115 (2013.01); C01F 7/442 (2013.01); C04B 35/6262 (2013.01); C04B 35/62675 (2013.01); C04B 35/645 (2013.01); C04B 35/6455 (2013.01); C01P 2004/22 (2013.01); C01P 2004/54 (2013.01); C01P 2006/80 (2013.01); C04B 2235/322 (2013.01); C04B 2235/3206 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/445 (2013.01); C04B 2235/5292 (2013.01); C04B 2235/5296 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/5472 (2013.01); C04B 2235/602 (2013.01); C04B 2235/604 (2013.01); C04B 2235/6025 (2013.01); C04B 2235/658 (2013.01); C04B 2235/6586 (2013.01); C04B 2235/668 (2013.01); C04B 2235/72 (2013.01); C04B 2235/721 (2013.01); C04B 2235/724 (2013.01); C04B 2235/725 (2013.01); C04B 2235/787 (2013.01); C04B 2235/9623 (2013.01); C04B 2235/9653 (2013.01);
Abstract
A method for producing a transparent alumina sintered body includes (a) the step of preparing an alumina raw material powder containing a plate-like alumina powder having an aspect ratio of 3 or more so that the mass ratio R1 of F to Al in the alumina raw material powder is 5 ppm or more, and forming a compaction raw material containing the alumina raw material powder into a compact, and (b) the step of pressure-sintering the compact at a temperature at which F evaporate to yield a transparent alumina sintered body.