Patent ID: 8822361

Claim:
A cubic boron nitride sintered body tool having a cubic boron nitride sintered body including cubic boron nitride particles and a binder phase at at least a cutting edge, wherein said cubic boron nitride sintered body includes 40-70 volume % of said cubic boron nitride particles, said binder phase includes a first component and a second component, said first component is TiC, said second component is one or both of TiB 2 and AlB 2 , and when X-ray diffraction intensity of plane (200) of said first component is I 1 and X-ray diffraction intensity of plane (101) of said second component is I 2 , said I 1 is the maximum of the X-ray diffraction intensity of all components in said cubic boron nitride sintered body excluding said cubic boron nitride particles, and satisfies 0.01≦I 2 /I 1 ≦0.1, wherein at least a portion of said second component is present so as to come into contact with a surface of the cubic boron nitride particle, a surface-constituting ratio of said second component at the surface of the cubic boron nitride particle is 20-70%, and said binder phase includes 1-10 volume % of said second component.