Patent ID: 11897037
Assignee: TUNGALOY CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein:
the coating layer comprises at least one α-type aluminum oxide layer having an average thickness of 5.2 μm or more to 8.0 μm or less;
in the α-type aluminum oxide layer, a texture coefficient TC (0,0,12) of a (0,0,12) plane represented by formula (1) below is from 7.0 or more to 7.8 or less, and a texture coefficient TC (1,0,16) of a (1,0,16) plane represented by formula (2) below is from 0.4 or more to 1.8 or less:, TC
          ⁡
          
            (
            
              0
              ,
              0
              ,
              12
            
            )
          
        
        =
        
          
            
              I
              ⁡
              
                (
                
                  0
                  ,
                  0
                  ,
                  12
                
                )
              
            
            
              
                I
                0
              
              ⁡
              
                (
                
                  0
                  ,
                  0
                  ,
                  12
                
                )
              
            
          
          ⁢
          
            
              {
              
                
                  1
                  9
                
                ⁢
                
                  ∑
                  
                    
                      I
                      ⁡
                      
                        (
                        
                          h
                          ,
                          k
                          ,
                          l
                        
                        )
                      
                    
                    
                      
                        I
                        0
                      
                      ⁡
                      
                        (
                        
                          h
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                          l
                        
                        )
                      
                    
                  
                
              
              }
            
            
              -
              1
            
          
        
      
    
    
      
        (
        1
        )
      
    
  
  
    
      
        
          TC
          ⁡
          
            (
            
              1
              ,
              0
              ,
              16
            
            )
          
        
        =
        
          
            
              I
              ⁡
              
                (
                
                  1
                  ,
                  0
                  ,
                  16
                
                )
              
            
            
              
                I
                0
              
              ⁡
              
                (
                
                  1
                  ,
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                  ,
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                )
              
            
          
          ⁢
          
            
              {
              
                
                  1
                  9
                
                ⁢
                
                  ∑
                  
                    
                      I
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                        (
                        
                          h
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                        )
                      
                    
                    
                      
                        I
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                        (
                        
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                        )
                      
                    
                  
                
              
              }
            
            
              -
              1
            
          
        
      
    
    
      
        (
        2
        ), and in formulae (1) and (2), I (h,k,l) denotes a peak intensity for an (h,k,l) plane in X-ray diffraction of the α-type aluminum oxide layer, I0 (h,k,l) denotes a standard diffraction intensity for an (h,k,l) plane which is indicated on JCPDS Card No. 10-0173 for α-type aluminum oxide, and (h,k,l) refers to the nine crystal planes of (0,1,2), (1,0,4), (1,1,0), (1,1,3), (1,1,6), (2,1,4), (3,0,0), (0,0,12) and (1,0,16), and
the coating layer comprises, between the substrate and the α-type aluminum oxide layer, a Ti compound layer containing a Ti compound of Ti and an element of at least one kind selected from the group consisting of C, N, O and B.