US 11,857,034 B2
Titanium sintered body, ornament, and timepiece
Keisuke Itotsubo, Hachinohe (JP)
Assigned to SEIKO EPSON CORPORATION
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Aug. 30, 2018, as Appl. No. 16/117,130.
Claims priority of application No. 2017-167825 (JP), filed on Aug. 31, 2017.
Prior Publication US 2019/0061003 A1, Feb. 28, 2019
Int. Cl. A44C 27/00 (2006.01); B22F 3/15 (2006.01); B22F 3/24 (2006.01); B22F 5/10 (2006.01); C22C 1/04 (2023.01); B22F 1/06 (2022.01); C22C 14/00 (2006.01); B22F 5/00 (2006.01)
CPC A44C 27/003 (2013.01) [B22F 1/06 (2022.01); B22F 3/15 (2013.01); B22F 3/24 (2013.01); B22F 5/106 (2013.01); C22C 1/0458 (2013.01); C22C 14/00 (2013.01); B22F 5/00 (2013.01); B22F 2003/247 (2013.01); B22F 2201/01 (2013.01); B22F 2201/10 (2013.01); B22F 2301/205 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A titanium sintered body, comprising:
particles of a titanium based powder sintered to one another, the titanium based powder including gallium as an α-phase stabilizing element;
an average crystal grain diameter on a surface of the body of more than 30 μm, and 500 μm or less;
an average aspect ratio of crystal structures of the titanium based powder is 2.1 or more and 3 or less; and
a Vickers hardness on the surface of 300 or more and 800 or less,
wherein an oxygen content on the surface is 3200 ppm by mass or more and 5500 ppm by mass or less; and
wherein a carbon content on the surface is 200 ppm by mass or more and 870 ppm by mass or less.