US 12,030,112 B2
Casting core containing ceramic and method for manufacturing cast article using the same
Nobuhiro Yasui, Kanagawa (JP); Yasushi Shimizu, Kanagawa (JP); Shunsuke Murakami, Tokyo (JP); and Kanako Oshima, Tokyo (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Apr. 6, 2022, as Appl. No. 17/714,906.
Claims priority of application No. 2021-067068 (JP), filed on Apr. 12, 2021.
Prior Publication US 2022/0379369 A1, Dec. 1, 2022
Int. Cl. B22C 9/10 (2006.01); B22C 7/02 (2006.01); B28B 1/00 (2006.01); B28B 11/04 (2006.01); B28B 11/08 (2006.01); B33Y 10/00 (2015.01); B33Y 40/20 (2020.01); B33Y 80/00 (2015.01)
CPC B22C 9/103 (2013.01) [B22C 7/02 (2013.01); B22C 9/10 (2013.01); B28B 1/001 (2013.01); B28B 11/04 (2013.01); B28B 11/0845 (2013.01); B33Y 10/00 (2014.12); B33Y 40/20 (2020.01); B33Y 80/00 (2014.12)] 13 Claims
OG exemplary drawing
 
1. A casting core containing a ceramic, the casting core comprising:
a core;
a surface layer; and
an intermediate layer between the core and the surface layer,
wherein a relative density of the intermediate layer is lower than a relative density of the surface layer, and the relative density of the intermediate layer is lower than a relative density of the core, and
wherein the relative density of the core is 82% or more, the relative density of the surface layer is 82% or more, and the relative density of the intermediate layer is 67% or less.