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US 11,884,595 B2Granted
Zirconia composition, pre-sintered body and sintered body, and method of producing the same
AssigneeKuraray Noritake Dental Inc.
InventorYoshihisa Ito
Life of this patent
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Abstract
A composition comprises a zirconia powder, in which 55% or more thereof is monoclinic, and a stabilizer capable of suppressing phase transition of zirconia. An average particle diameter of zirconia particles and particles of the stabilizer is 0.06 μm to 0.17 μm. At least a portion of the stabilizer does not form a solid solution with zirconia.
Claims14
A pre-sintered body comprising:
- zirconia in which 55% or more thereof is monoclinic;
- and
- 4.5 mol % or more and less than 5.8 mol % of yttria based on a total amount of moles of zirconia and yttria,
- wherein at least a portion of the stabilizer does not form a solid solution with zirconia;
- wherein the pre-sintered body is produced by firing a pressed body of a composition at a temperature of 800° C. to 1200° C., the composition comprising zirconia and yttria for producing the zirconia pre-sintered body, the composition having an average particle size of 0.06 μm to 0.17 μm;
- and
- wherein fy calculated based on the following expression 1 is 3% or more:
- f
- y
- (
- %
- )
- =
- I
- y
- (
- 111
- )
- I
- y
- (
- 111
- )
- +
- I
- m
- (
- 111
- )
- +
- I
- m
- (
- 11
- -
- 1
- )
- +
- I
- t
- (
- 111
- )
- +
- I
- c
- (
- 111
- )
- ×
- 100
- [
- Expression
-
- 1
- ]
- wherein Iy (111) represents a peak intensity of plane (111) of yttria in an X-ray diffraction pattern using CuKα radiation,
- Im (111) and Im (11-1) represent peak intensities of plane (111) and plane (11-1) of monoclinic zirconia in the X-ray diffraction pattern, respectively,
- It(111) represents a peak intensity of plane (111) of tetragonal zirconia in the X-ray diffraction pattern, and
- Ic (111) represents a peak intensity of plane (111) of cubic zirconia in the X-ray diffraction pattern.
57 more elements
A pre-sintered body comprising:
- zirconia in which 55% or more thereof is monoclinic;
- and
- 5.8 mol % or more and less than 7.5 mol % of yttria based on a total amount of moles of zirconia and yttria,
- wherein at least a portion of the stabilizer does not form a solid solution with zirconia;
- wherein the pre-sintered body is produced by firing a pressed body of a composition at a temperature of 800° C. to 1200° C. the composition comprising zirconia and yttria for producing the zirconia pre-sintered body, the composition having an average particle size of 0.06 μm to 0.17 μm;
- and
- wherein fy calculated based on the following expression 2 is 4% or more:
- f
- y
- (
- %
- )
- =
- I
- y
- (
- 111
- )
- I
- y
- (
- 111
- )
- +
- I
- m
- (
- 111
- )
- +
- I
- m
- (
- 11
- -
- 1
- )
- +
- I
- t
- (
- 111
- )
- +
- I
- c
- (
- 111
- )
- ×
- 100
- [
- Expression
-
- 2
- ]
- wherein Iy (111) represents a peak intensity of plane (111) of yttria in an X-ray diffraction pattern using CuKα radiation,
- Im (111) and Im (11-1) represent peak intensities of plane (111) and plane (11-1) of monoclinic zirconia in the X-ray diffraction pattern, respectively,
- It (111) represents a peak intensity of plane (111) of tetragonal zirconia in the X-ray diffraction pattern, and
- Ic (111) represents a peak intensity of plane (111) of cubic zirconia in the X-ray diffraction pattern.
57 more elements
Dependencies are inferred from the claim text.