| 摘要 |
In a surface-coated boron nitride sintered compact tool, at least a part of the tool edge related with cutting is based on a substrate of a high pressure phase type boron nitride, and a surface-coated layer is provided on the surface thereof. The surface-coated layer includes an intermediate layer present in a discontinuous manner or in the form of dispersed particles at the interface of the high pressure phase boron nitride sintered compact substrate, and further includes a hard coated layer formed thereon. The intermediate layer consists of at least one element selected from the Groups 4a, 5a and 6a of the Periodic Table, and has a thickness of at most 1 mum, or has a proportion of 1 to 20 vol % of particles with a particle diameter of 0.1 to less than 0.5 mum and at most 5 vol. % of particles with a particle diameter of at least 0.5 mum. Thereby, a markedly improved adhesive strength of the hard coated layer on the substrate is achieved.
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