Surface-coated sintered body

摘要

A surface-coated sintered body includes a sintered body of cubic boron nitride (cBN) and a surface coating layer formed on a surface thereof, the sintered body of cBN containing 20 to 99.5% by volume of cBN and a binder, the surface coating layer including an adhesion layer and at least one hard coating layer, the adhesion layer being a metal layer containing at least W and being formed to cover a portion of the surface of the sintered body of cBN, the hard coating layer being formed to cover the sintered body of cBN and the adhesion layer, a ratio of cBN particles in contact with the adhesion layer to a total number of cBN particles in contact with the adhesion layer or the hard coating layer in the surface of the sintered body of cBN being 0.01 to 20%.

主权项

1. A surface-coated sintered body, comprising:
a sintered body of cubic boron nitride; and a surface coating layer formed on a surface thereof, said sintered body of cubic boron nitride containing 20 to 99.5% by volume of cubic boron nitride and a binder, said surface coating layer including an adhesion layer and at least one hard coating layer, said adhesion layer being a metal layer containing at least W, and being formed to cover a portion of the surface of said sintered body of cubic boron nitride, said hard coating layer being formed to cover said sintered body of cubic boron nitride and said adhesion layer, a ratio of cubic boron nitride particles in contact with said adhesion layer to a total number of cubic boron nitride particles in contact with said adhesion layer or said hard coating layer in the surface of said sintered body of cubic boron nitride being 0.01 to 20%.