Sumitomo Electric Industries, Limited

Sumitomo Electric Hardmetal Corp.

Minori Teramoto

Hitoshi Sumiya

Katsuko Yamamoto

Satoru Kukino

Yoshiki Nishibayashi

Katsumi Okamura

Tomohiro Fukaya

Yutaka Kobayashi

Issei Satoh

Kensei Hamaki

Ryo Toyoshima

Provided is a synthetic single-crystal diamond containing nitrogen. In an X-ray absorption fine structure thereof, a ratio I/Ibetween an intensity Iof a peak which appears at an energy of 405±1 eV and has a full width at ¾ maximum of 3 eV or more and an intensity Iof a peak which appears at an energy of 412±2 eV is less than 1.5.

Synthetic single crystal diamond, tool including the same and method of producing synthetic single crystal diamond

Provided is a synthetic single crystal diamond containing nitrogen atoms at a concentration of more than 600 ppm and 1500 ppm or less. The Raman shift &#x3bb;' (cm) of a peak in a primary Raman scattering spectrum of the synthetic single crystal diamond and the Raman shift &#x3bb; (cm) of a peak in a primary Raman scattering spectrum of a synthetic type IIa single crystal diamond containing nitrogen atoms at a content of 1 ppm or less satisfy the following expression (1):&#x3bb;&#x2032;&#x2212;&#x3bb;&#x2265;&#x2212;0.10&#x2003;&#x2003;(1).

Synthetic single crystal diamond

The composite sintered body of the invention is a composite sintered body, containing 20 volume % or more and 80 volume % or less of cubic boron nitride particles, and a binder; wherein the binder contains at least one selected from the group consisting of nitrides, carbides, borides, and oxides of elements in the group 4a, elements in the group 5a, and elements in the group 6a in the periodic table, and solid solutions thereof, at least one selected from the group consisting of simple substances of Zr, Si, Hf, Ge, W and Co, compounds thereof, and solid solutions thereof, and a compound of Al; and when the composite sintered body contains therein W and/or Co, the total weight of the W and/or Co is less than 2.0 weight % and further the composite sintered body contains therein one or more of the Zr, Si, Hf and Ge (hereinafter referred to as 'X'), and when the composite sintered body contains the X, the amount of each of the X is 0.005 weight % or more and less than 2.0 weight %, X/(X+W+Co) is 0.01 or more and 1.0 or less and further the weight of Al is 2.0 weight % or more and 20.0 weight % or less.

Composite sintered body

Growing community of inventors

Itami, Japan

Minori Teramoto