Cubic boron nitride sintered body tool

摘要

The cubic boron nitride sintered body tool of the present invention has a cubic boron nitride sintered body including cubic boron nitride particles and a binder phase at at least a cutting edge. The cubic boron nitride sintered body includes 40-70 volume % of cubic boron nitride particles. The binder phase includes a first component and a second component. The first component includes TiC, and the second component includes one or both of TiB2 and AlB2. When the X-ray diffraction intensity of plane (200) of the first component is I1 and the X-ray diffraction intensity of plane (101) of said second component is I2, I1 is the maximum of the X-ray diffraction intensity of all components in the cubic boron nitride sintered body excluding the cubic boron nitride particles, and satisfies 0.01≦I2/I1≦0.1.

主权项

1. 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 TiB2 and AlB2, and when X-ray diffraction intensity of plane (200) of said first component is I1 and X-ray diffraction intensity of plane (101) of said second component is I2, said I1 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≦I2/I1≦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.