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:
Jul. 14, 2020
Filed:
Dec. 19, 2018
Applicant:
Showa Denko K.k., Tokyo, JP;
Inventor:
So Miyaishi, Kawasaki, JP;
Assignee:
SHOWA DENKO K.K., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B24D 3/14 (2006.01); B24D 5/02 (2006.01); B24D 7/02 (2006.01); C04B 35/10 (2006.01); B24D 3/18 (2006.01); B24D 18/00 (2006.01);
U.S. Cl.
CPC ...
B24D 7/02 (2013.01); B24D 3/14 (2013.01); B24D 3/18 (2013.01); B24D 5/02 (2013.01); B24D 18/00 (2013.01); C04B 35/10 (2013.01);
Abstract
To provide an alumina sintered body, abrasive grains, and a grinding wheel having high hardness and excellent wear resistance. An alumina sintered body comprising: an inner layer comprising alumina crystal grains; and an outer layer covering at least a part of the inner layer from outside, having a higher content of an alkaline earth metal than the inner layer, and comprising alumina crystal grains, wherein the content of the alkaline earth metal in the outer layer is 1.0 to 30.0 mass % in terms of oxide, the alumina sintered body being free from silicon except unavoidable impurities.