Composite sintered body

摘要

A composite sintered body according to the present invention contains at least cubic boron nitride and a binder. Cubic boron nitride has a continuous skeleton structure as a result of bonding of a plurality of first cubic boron nitride particles to each other. The binder has a continuous structure as a result of bonding of a plurality of binder particles to each other, that are present in a region except for a bonding interface where the first cubic boron nitride particles are bonded to each other. Second cubic boron nitride particles isolated from the first cubic boron nitride particles forming the skeleton structure are dispersed in the continuous structure of the binder particles.

主权项

1. A composite sintered body comprising:
cubic boron nitride; and a binder, wherein: said cubic boron nitride has a continuous skeleton structure as a result of bonding of a plurality of first cubic boron nitride particles to each other, said binder has a continuous structure as a result of bonding of a plurality of binder particles to one another, the binder particles being present in a region except for a bonding interface where said first cubic boron nitride particles are bonded to each other, second cubic boron nitride particles, which are isolated from said first cubic boron nitride particles forming said continuous skeleton structure, are dispersed in said continuous structure of said binder particles, a relation of 0.05≦X/Y≦0.5 is satisfied, where said second cubic boron nitride particles dispersed in said continuous structure have an average particle size of X μm, and said first cubic boron nitride particles have an average particle size of Y μm, and said second cubic boron nitride particles are dispersed in said continuous structure at a ratio in a range from at least 5 volume % to at most 50 volume %.