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US 2020/0369573 A1Published application
Method for producing zirconia particle-containing powder
AssigneeKuraray Noritake Dental Inc.
InventorYasutaka KUDO
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AssigneeKuraray Noritake Dental Inc.
InventorYasutaka KUDO
Estimating the term…
The present invention provides a method for producing a zirconia particle-containing powder that enables easy production of a zirconia sintered body having both high translucency and high strength. The present invention relates to a method for producing a zirconia particle-containing powder, comprising a drying step of spray drying a slurry containing zirconia particles, wherein the zirconia particles have an average primary particle diameter of 30 nm or less, and the slurry comprises a dispersion medium containing a liquid having a surface tension at 25° C. of 50 mN/m or less. Preferably, the zirconia particles comprise 2.0 to 9.0 mol % yttria. Preferably, wherein the content of the liquid in the dispersion medium is 50 mass % or more.
A method for producing a zirconia particle-containing powder, comprising a drying step of spray drying a slurry containing zirconia particles, wherein the zirconia particles have an average primary particle diameter of 30 nm or less, and the slurry comprises a dispersion medium containing a liquid having a surface tension at 25° C. of 50 mN/m or less.
A powder comprising zirconia particles, wherein the zirconia particles have an average primary particle diameter of 30 nm or less, and the powder has a three-point flexural strength of 400 MPa or more after a zirconia shaped body formed by shaping the powder by uniaxial pressing and subsequently subjecting the powder to cold isostatic pressing (CIP) under a pressure of 170 MPa is sintered at 1,100° C. for 2 hours under ordinary pressure, and has a transmittance of 40% or more for light of 700 nm wavelength through a thickness of 0.5 mm after a zirconia shaped body formed by shaping the powder by uniaxial pressing and subsequently subjecting the powder to cold isostatic pressing (CIP) under a pressure of 170 MPa is sintered at 1,100° C. for 2 hours under ordinary pressure.
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Dependencies are inferred from the claim text.