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AssigneeSumitomo Electric Hardmetal Corp.
InventorsKento Yamada, Machiko Abe, Hironari Moroguchi, Akihiko Ueda, Satoru Kukino
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A cubic boron nitride sintered material comprising cubic boron nitride grains, a binder phase, and a void, in which a percentage of the cubic boron nitride grains based on the total of the cubic boron nitride grains and the binder phase is 40 vol % to 70 vol %, a percentage of the binder phase based on the total of the cubic boron nitride grains and the binder phase is 30 vol % to 60 vol %, the binder phase includes 10 vol % to 100 vol % of aluminum oxide grains, an average grain size of the aluminum oxide grains is 50 to 250 nm, the cubic boron nitride sintered material comprises 0.001 vol % to 0.100 vol % of one or more first voids, and at least one portion of each of the first voids is in contact with the aluminum oxide grains.
A cubic boron nitride sintered material comprising cubic boron nitride grains, a binder phase, and one or more first voids, wherein
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