SURFACE-COATED BORON NITRIDE SINTERED COMPACT TOOL

摘要

A surface-coated boron nitride sintered body tool is provided, in which at least a cutting edge portion includes a compound sintered body and a coating layer provided on a surface of the compound sintered body. The compound sintered body includes cubic boron nitride particles and binder particles. The compound sintered body includes 45 vol% or more and 80 vol% or less of cubic boron nitride particles. A first particle size distribution curve of the cubic boron nitride particles has one or more peaks in a range in which a particle size is 0 1 µm or more and 0.7 µm or less. A second particle size distribution curve of the cubic boron nitride particles has a first peak having a maximum peak height in a range in which the particle size is 2.0 µm or more and 7.0 µm or less. An integral value ratio (I o /I t × 100) between an integral value I o and an integral value I t is 1 or more and 20 or less, in the second particle size distribution curve, the integral value I o being in the range in which the particle size is 0.1 µm or more and 0.7 µm or less, and the integral value I t being in an entire range.