Red light transmitting zirconia sintered body, method for producing the same, member comprising the sintered body, and jewelry goods and exterior component using the member

Patent metadata

Field	Value
Publication number	US-9249057-B2
Application number	US-201113583370-A
Country	US
Kind code	B2
Filing date	Mar 4, 2011
Priority date	Mar 9, 2010
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

An object of the present invention is to provide a colored translucent zirconia sintered body having red color and high translucency. The present invention relates to a zirconia sintered body, characterized by containing 6 to 30 mo % of yttria and 0.1 to 5 mol % of cerium oxide in terms of CeO 2 , the cerium oxide containing an oxide of trivalent cerium. The zirconia sintered body of the present invention has, in addition of high hardness, diamond luster based on high refractive index inherent in zirconia, deep red color and transparency.

First claim

The invention claimed is:

1. A zirconia sintered body comprising 6 to 30 mol % of yttria, and 0.1 to 5 mol % of cerium oxide in terms of CeO 2 , the cerium oxide containing an oxide of trivalent cerium;
wherein, in a sample of the zirconia sintered body having a thickness of 1 mm, a maximum value of inline transmission to visible light having a wavelength of 600 to 800 nm is 40% or more, and
an average grain size of crystal particles is 10 μm or more and 50 μm or less.

2. The zirconia sintered body according to claim 1 , wherein a crystal phase is a cubic fluorite structure.

3. The zirconia sintered body according to claim 2 , wherein in a sample having a thickness of 1 mm, a maximum value of in-line transmission to visible light having a wavelength of 400 to 500 nm is 3% or less, and a maximum value of in-line transmission to visible light having a wavelength of 600 to 800 nm is 40% or more.

4. The zirconia sintered body according to claim 2 , wherein brightness L*, and hues a* and b* are 20≦L*≦50, 40≦a*≦60 and 30≦b*≦70.

5. A member comprising the zirconia sintered body according to claim 2 .

6. The zirconia sintered body according to claim 1 , wherein in a sample having a thickness of 1 mm, a maximum value of in-line transmission to visible light having a wavelength of 400 to 500 nm is 3% or less, and a maximum value of in-line transmission to visible light having a wavelength of 600 to 800 nm is 40% or more.

7. The zirconia sintered body according to claim 1 , wherein brightness L*, and hues a* and b* are 20≦L*≦50, 40≦a*≦60 and 30≦b*≦70.

8. A method for producing a zirconia sintered body of claim 1 , comprising
molding a zirconia powder containing 6 to 30 mol % of yttria and 0.1 to 5 mol % of cerium oxide in terms of CeO 2 ,
subjecting the resulting molding to primary sintering, hot isostatic press treatment and annealing, and
forming trivalent cerium in the sintered body.

9. The production method according to claim 8 , wherein the HIP treatment is conducted by placing the primary sintered body in a gas-permeable container.

10. The method for producing a zirconia sintered body according to claim 9 , wherein the annealing is conducted at 800° C. or higher and 1,000° C. or lower.

11. The production method according to claim 9 , wherein the primary sintered body to be subjected to the HIP treatment has an average grain size of 5 μm or less.

12. The method for producing a zirconia sintered body according to claim 8 , wherein the annealing is conducted at 800° C. or higher and 1,000° C. or lower.

13. The production method according to claim 8 , wherein the primary sintered body to be subjected to the HIP treatment has an average grain size of 5 μm or less.

14. A member comprising the zirconia sintered body according to claim 1 .

15. Jewelry goods comprising the member according to claim 14 .

16. An exterior component comprising the member according to claim 14 .

Assignees

• Tsukuma Koji
• Tosoh Corp

Inventors

• Tsukuma Koji

Classifications

• C04B2235/3244

  Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof · CPC title

• C04B2235/9661

  Colour · CPC title

• C04B2235/762

  Cubic symmetry, e.g. beta-SiC · CPC title

• C04B2235/3225

  Yttrium oxide or oxide-forming salts thereof · CPC title

• C04B2235/3224

  Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide · CPC title