Mitsubishi Materials Corporation

Shirou Oguchi

Masahiro Yano

Yosuke Miyashita

A cBN sintered compact has cubic boron nitride particles and a ceramic binder phase, and in the sintered compact, WSihaving an average particle diameter of 10 nm to 200 nm is dispersed such that a content thereof is 1 vol % to 20 vol %. A cutting tool has the cBN sintered compact as a tool body.

cBN sintered compact and cutting tool

A cBN sintered material cutting tool includes a cutting tool body that is made of a sintered material including cubic boron nitride particles and a binder phase, in which: an average particle size of the cBN particles is 0.5 &#x3bc;m or less and a content ratio of the cBN particles in the sintered material is 35 vol % to 80 vol %; and the binder phase includes 1.0 vol % to 20 vol % of an Al compound, an average particle size of the Al compound present in the binder phase is 300 nm or less, and a value of a ratio (a value of S/S; area ratio) of a content Sof nitrogen (N) included in the Al compound to a content Sof oxygen (O) included in the Al compound is 1.1 to 5.

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Naka, Japan

Shirou Oguchi