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US 12,577,170 B2Granted
Zirconia sintered body and method for producing the same
AssigneeTosoh Corporation
InventorsSatoshi Tsuchiya, Hiroyuki Fujisaki, Hitoshi Nagayama
Life of this patent
Estimating the term…
Abstract
A complex sintered body includes a lamination of a layer composed of a zirconia sintered body containing 0.5% or more by mole and less than 4% by mole of an oxide of cerium in terms of CeO2, 2% or more by mole and less than 6% by mole of yttria and 0.1% or more by mass and less than 2% by mass of an oxide of aluminum; and at least one of a layer composed of a zirconia-based sintered body containing 2.0% or more by mass and 20.0% or less by mass of an oxide of aluminum, and a layer composed of a zirconia-based sintered body containing 2% or more by mole and less than 6% by mole of yttria and a coloring agent.
Claims18
A complex sintered body, comprising:
- a lamination of a layer comprising a zirconia sintered body comprising 0.5% or more by mole and less than 4% by mole of an oxide of cerium in terms of CeO2, 2% or more by mole and less than 6% by mole of yttria and 0.1% or more by mass and less than 2% by mass of an oxide of aluminum, a balance being zirconia, the oxide of cerium containing trivalent cerium, and the zirconia having a crystal structure including a tetragonal structure;
- and
- at least one of:
- a layer comprising a zirconia-based sintered body comprising 2.0% or more by mass and 20.0% or less by mass of an oxide of aluminum, a balance being zirconia-comprising 2% or more by mole and less than 6% by mole of yttria, and a layer comprising a zirconia-based sintered body containing 2% or more by mole and less than 6% by mole of yttria and
- a coloring agent, a balance being zirconia, a lightness L* being 10 or more and 75 or less, a hue a* being −3 or less or 3 or more, a hue b* being −3 or less or 3 or more, a chroma C* being 1 or more and 30 or less in an L*a*b* color system,
- wherein a thickness of the complex sintered body is 2.0 mm or more,
- a ratio of a thickness of the zirconia-based sintered body to a thickness of the layer comprising the zirconia sintered body is 4.0 or more and 8.0 or less, and
- a proportion of a reflectance of the zirconia-based sintered body at a sample thickness of 0.3 mm and a measurement wavelength of 580 nm to the reflectance at a measurement wavelength of 650 nm is 0.7 or more and 2.5 or less.
5 more elements
A complex sintered body, having a structure in which two or more sintered bodies having different compositions laminated by sintering and comprising:
- a lamination of a layer comprising a zirconia sintered body comprising 0.5% or more by mole and less than 4% by mole of an oxide of cerium in terms of CeO2, 2% or more by mole and less than 6% by mole of yttria and 0.1% or more by mass and less than 2% by mass of an oxide of aluminum, a balance being zirconia, the oxide of cerium containing trivalent cerium, and the zirconia having a crystal structure including a tetragonal structure;
- and
- at least one of a layer comprising a zirconia-based sintered body comprising 2.0% or more by mass and 20.0% or less by mass of an oxide of aluminum, a balance being zirconia containing comprising 2% or more by mole and less than 6% by mole of yttria, and a layer comprising a zirconia-based sintered body containing 2% or more by mole and less than 6% by mole of yttria and a coloring agent, a balance being zirconia, a lightness L* being 10 or more and 75 or less, a hue a* being −3 or less or 3 or more, a hue b* being −3 or less or 3 or more, a chroma C* being 1 or more and 30 or less in an L*a*b* color system,
- wherein a thickness of the complex sintered body is 2.0 mm or more and a ratio of a thickness of the zirconia-based sintered body to a thickness of the layer comprising the zirconia sintered body is 1.0 or more and 10.0 or less, and
- a proportion of a reflectance of the zirconia-based sintered body at a sample thickness of 00.3 mm and a measurement wavelength of 580 nm to the reflectance at a measurement wavelength of 650 nm is 0.7 or more and 2.5 or less.
2 more elements
A complex sintered body, comprising:
- a lamination of a layer comprising a zirconia sintered body comprising 0.5% or more by mole and less than 4% by mole of an oxide of cerium in terms of CeO2, 2% or more by mole and less than 6% by mole of yttria and 0.1% or more by mass and less than 2% by mass of an oxide of aluminum, a balance being zirconia, the oxide of cerium containing trivalent cerium, and the zirconia having a crystal structure including a tetragonal structure;
- and
- at least one of:
- a layer composed of comprising a zirconia-based sintered body containing comprising 2.0% or more by mass and 20.0% or less by mass of an oxide of aluminum, a balance being zirconia comprising 2% or more by mole and less than 6% by mole of yttria, and a layer comprising a zirconia-based sintered body containing 2% or more by mole and less than 6% by mole of yttria and
- a coloring agent, a balance being zirconia, a lightness L* being 10 or more and 75 or less, a hue a* being −3 or less or 3 or more, a hue b* being −3 or less or 3 or more, a chroma C* being 1 or more and 30 or less in an L*a*b* color system in response to light from an external source, wherein a ratio of a thickness of the zirconia-based sintered body to a thickness of the layer comprising the zirconia sintered body is 4.0 or more and 8.0 or less, and
- a proportion of a reflectance of the zirconia-based sintered body at a sample thickness of 0.3 mm and a measurement wavelength of 580 nm to the reflectance at a measurement wavelength of 650 nm is 0.7 or more and 2.5 or less.
3 more elements
A complex sintered body, having a structure in which two or more sintered bodies having different compositions laminated by sintering and comprising:
- a lamination of a layer comprising a zirconia sintered body comprising 0.5% or more by mole and less than 4% by mole of an oxide of cerium in terms of CeO2, 2% or more by mole and less than 6% by mole of yttria and 0.1% or more by mass and less than 2% by mass of an oxide of aluminum, a balance being zirconia, the oxide of cerium containing trivalent cerium, and the zirconia having a crystal structure including a tetragonal structure;
- and
- at least one of:
- a layer comprising a zirconia-based sintered body comprising 2.0% or more by mass and 20.0% or less by mass of an oxide of aluminum, a balance being zirconia comprising 2% or more by mole and less than 6% by mole of yttria, and a layer comprising a zirconia-based sintered body containing 2% or more by mole and less than 6% by mole of yttria and a coloring agent, a balance being zirconia, a lightness L* being 10 or more and 75 or less, a hue a*being −3 or less or 3 or more, a hue b* being −3 or less or 3 or more, a chroma C* being 1 or more and 30 or less in an L*a*b* color system in response to light from an external source,
- wherein a ratio of a thickness of the zirconia-based sintered body to a thickness of the layer comprising the zirconia sintered body is 1.0 or more and 10.0 or less, and
- a proportion of a reflectance of the zirconia-based sintered body at a sample thickness of 0.3 mm and a measurement wavelength of 580 nm to the reflectance at a measurement wavelength of 650 nm is 0.7 or more and 2.5 or less.
3 more elements
Dependencies are inferred from the claim text.