Dental ceramic oxide pre-sintered body having excellent machinability and production method for same

2:

• The oxide ceramic pre-sintered body for dental use according to claim 1, which has a relative density of 43 to 63%.

3:

• The oxide ceramic pre-sintered body for dental use according to claim 1, which has a BET specific surface area of 5 to 25 m2/g as measured in compliance with JIS Z 8830:2013.

4:

• The oxide ceramic pre-sintered body for dental use according to claim 1, which has a three-point flexural strength of 10 to 50 MPa as measured in compliance with JIS R 1601:2008.

5:

• The oxide ceramic pre-sintered body for dental use according to claim 1, which has a Vickers hardness of 350 HV 5/30 or less as measured in compliance with JIS Z 2244:2020.

6:

• The oxide ceramic pre-sintered body for dental use according to claim 1, wherein the oxide ceramic particles comprise zirconia and/or alumina.

7:

• The oxide ceramic pre-sintered body for dental use according to claim 6, wherein the alumina comprises α-alumina with a purity of 99.5% or more.

8:

• The oxide ceramic pre-sintered body for dental use according to claim 6, further comprising a sintering aid, wherein the sintering aid comprises at least one element selected from the group consisting of a Group 2 element, Ce, Zr, and Y.

9:

• The oxide ceramic pre-sintered body for dental use according to claim 1, which, after being fired into a sintered body at 1,400° C. or less without hot isostatic pressing, shows a translucency (ΔL) of 9 or more as a sintered body of 1.2 mm thickness, and a total transmittance of 27% or more and a linear light transmittance of 0.5% or more as a sintered body of 1.0 mm thickness under a D65 illuminant.

10:

• The oxide ceramic pre-sintered body for dental use according to claim 1, which shows a number-based average crystal grain size of 0.3 to 8.0 μm after being fired into a sintered body at 1,400° C. or less without hot isostatic pressing.

12:

• The method for producing an oxide ceramic pre-sintered body for dental use according to claim 11, wherein the oxide ceramic particles comprise zirconia and/or alumina.

13:

• The method for producing an oxide ceramic pre-sintered body for dental use according to claim 12, wherein the alumina comprises α-alumina with a purity of 99.5% or more.

14:

• A method for producing an oxide ceramic sintered body for dental use, comprising sintering the oxide ceramic pre-sintered body of claim 1 under atmospheric pressure without hot isostatic pressing.

15:

• A method for producing an oxide ceramic sintered body for dental use, comprising sintering the oxide ceramic pre-sintered body produced by the method of claim 11 under atmospheric pressure without hot isostatic pressing.