Sumitomo Electric Industries, Limited

Sumitomo Electric Hardmetal Corp.

Yuka Deguchi

Satoru Kukino

Katsumi Okamura

Akito Ishii

Mayu Amemiya

A cubic boron nitride sintered material comprises cubic boron nitride particles, a binding phase, and an interfacial phase. The interfacial phase intervenes between the cubic boron nitride particles and the binding phase. The interfacial phase includes aluminum, nitrogen, boron, and oxygen. A total of an average value of the atomic concentrations of aluminum included in the interfacial phase and an average value of the atomic concentrations of nitrogen included in the interfacial phase is 50.0 at % or more. A ratio of an average value of the atomic concentrations of nitrogen included in the interfacial phase to an average value of the atomic concentrations of boron included in the interfacial phase is more than 1.00.

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Osaka, Japan

Yuka Deguchi