US 11,807,579 B2
Zirconia sintered body and manufacturing method of the same
Takeshi Ito, Kanagawa (JP); Yuji Matsumura, Kanagawa (JP); and Isao Yamashita, Kanagawa (JP)
Assigned to TOSOH CORPORATION, Yamaguchi (JP)
Filed by TOSOH CORPORATION, Yamaguchi (JP)
Filed on Sep. 2, 2020, as Appl. No. 17/010,486.
Claims priority of application No. 2019-161077 (JP), filed on Sep. 4, 2019; application No. 2019-161082 (JP), filed on Sep. 4, 2019; and application No. 2019-161090 (JP), filed on Sep. 4, 2019.
Prior Publication US 2021/0061717 A1, Mar. 4, 2021
Int. Cl. C04B 35/49 (2006.01); C04B 41/87 (2006.01); C04B 37/00 (2006.01); C04B 35/645 (2006.01)
CPC C04B 35/49 (2013.01) [C04B 35/6455 (2013.01); C04B 37/005 (2013.01); C04B 41/87 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/9653 (2013.01); C04B 2235/9661 (2013.01); C04B 2237/348 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A zirconia sintered body comprising:
a transparent zirconia portion and an opaque zirconia portion, wherein
the zirconia sintered body has a structure where the transparent zirconia portion and the opaque zirconia portion are sintered,
a biaxial bending strength is 300 MPa or more,
the opaque zirconia portion comprises an opaque zirconia sintered body, and a color tone in the L*a*b* color system for the opaque zirconia sintered body is:
L*: 0 or more and 100 or less,
a*: −100 or more and 100 or less,
b*: −100 or more and 100 or less, and
the color tone does not include color tones where, when L* is 10 or more, a* is in a range of from −2 to 2, and b* is in a range of from −2 to 5.