Patent ID: 11873254
Assignee: KURARAY NORITAKE DENTAL INC.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  A | IPC A  C

Claim 1:
2. A composition comprising:
a zirconia powder, 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 an average particle size of zirconia particles and particles of the stabilizer is 0.06 μm to 0.17 μm,
wherein at least a portion of the stabilizer does not form a solid solution with zirconia, 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.