Sumitomo Electric Hardmetal Corp.

Yoshiaki Sorai

Katsumi Okamura

Yasuyuki Kanada

Tomohiro Fukaya

Yuji Tomoda

Takahiro Okuno

Cutting tool

A cubic boron nitride sintered body includes cubic boron nitride, a binder, and a metal catalyst element, a content by percentage of the cubic boron nitride is 50 vol % or more and 85 vol % or less, a content by percentage of the catalyst is 0.5 mass % or more and 5 mass % or less. A sum of a detected peak value of nitrogen and a detected peak value of boron at each of arbitrary measurement points on line segments is calculated, a measurement point at which the sum is a half or less of a maximum value among the sums at all measurement points respectively is identified as a binder-portion measurement point, and a ratio of the number of measurement points at which the catalyst element is not detected among the binder-portion measurement points, to a total number of all binder-portion measurement points, is 30% or less.

Growing community of inventors

Itami, Japan

Yoshiaki Sorai