US 11,667,574 B2
Precursor of alumina sintered body, method for producing alumina sintered body, method for producing abrasive grains, and alumina sintered body
So Miyaishi, Kawasaki (JP); and Satoshi Iinou, Matsumoto (JP)
Assigned to SHOWA DENKO K.K., Tokyo (JP)
Appl. No. 16/768,231
Filed by SHOWA DENKO K.K., Tokyo (JP)
PCT Filed Dec. 25, 2018, PCT No. PCT/JP2018/047595
§ 371(c)(1), (2) Date May 29, 2020,
PCT Pub. No. WO2019/131644, PCT Pub. Date Jul. 4, 2019.
Claims priority of application No. JP2017-251271 (JP), filed on Dec. 27, 2017.
Prior Publication US 2020/0308056 A1, Oct. 1, 2020
Int. Cl. C04B 35/10 (2006.01); C09K 3/14 (2006.01)
CPC C04B 35/10 (2013.01) [C09K 3/1418 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/404 (2013.01); C04B 2235/405 (2013.01); C04B 2235/407 (2013.01); C04B 2235/408 (2013.01)] 9 Claims
 
1. A precursor of an alumina sintered compact comprising aluminum, yttrium, silicon, and at least one metal selected from the group consisting of iron, zinc, cobalt, manganese, copper, niobium, antimony, tungsten, silver, and gallium, wherein
the content of the aluminum is 98.0% by mass or more as expressed in terms of an oxide (Al2O3) in 100% by mass of the precursor of an alumina sintered compact;
the content of the yttrium is 0.01 to 1.35 parts by mass as expressed in terms of an oxide (Y2O3) based on 100 parts by mass of the content of the aluminum as expressed in terms of an oxide;
the total content of the metals selected from the foregoing group is 0.02 to 1.55 parts by mass as expressed in terms of an oxide based on 100 parts by mass of the content of aluminum as expressed in terms of an oxide;
the aluminum is contained as α-alumina; and
the content of the silicon is 0.001 to 0.12 parts by mass as expressed in terms of an oxide (SiO2) based on 100 parts by mass of the content of the aluminum as expressed in terms of the oxide (Al2O3).