Sumitomo Electric Industries, Limited

Kensei Hamaki

Hitoshi Sumiya

Katsuko Yamamoto

Yoshiki Nishibayashi

Natsuo Tatsumi

Yuh Ishida

Keiichi Tsuda

Takato Yamanishi

Minori Teramoto

A diamond polycrystal is a diamond polycrystal basically composed of a diamond single phase, wherein the diamond polycrystal is composed of a plurality of diamond grains having an average grain size of less than or equal to 30 nm, and the diamond polycrystal has a carbon dangling bond density of more than or equal to 10 ppm.

Diamond polycrystal and method of producing the same

A cemented carbide includes a first hard phase and a binder phase. The first hard phase is composed of tungsten carbide grains. The binder phase includes cobalt and nickel as constituent elements. An arbitrary surface or arbitrary cross section of the cemented carbide has: a region Rinterposed between an interface between the tungsten carbide grains and the binder phase and an imaginary line A; a region Rinterposed between the imaginary line A and an imaginary line B; and a region Rother than the region Rand R. When a line analysis is performed in a range including the region Rand the region Radjacent to the region Rwith the region R, a ratio C/Cof a maximum atomic concentration Cat % of cobalt in the region Rand a maximum atomic concentration Cat % of cobalt in the region Ris more than 1.

Cemented carbide and cutting tool including same as substrate

This method for producing a body obtained by processing a solid carbon-containing material includes: a step of preparing the solid carbon-containing material having at least a surface composed of solid carbon; and a step of processing the solid carbon-containing material. The step of processing the solid carbon-containing material includes: a sub-step of forming non-diamond carbon by heat-treating the solid carbon in the surface of the solid carbon-containing material; and a sub-step of removing at least a part of the non-diamond carbon.

Body obtained by processing solid carbon-containing material and producing method thereof

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

A method for producing a body obtained by processing a solid carbon-containing material, the method includes: preparing the solid carbon-containing material composed of a material having at least a surface containing solid carbon; forming a gas phase fluid containing at least one of an active gas or an active plasma which are active against the solid carbon; and processing the solid carbon-containing material by injecting the gas phase fluid onto at least a part of the surface of the solid carbon-containing material.

Body obtained by processing solid carbon-containing material, producing method thereof, and producing apparatus thereof

An indenter is made of polycrystalline diamond and has a tip having a spherical surface with a radius of 10 to 2000 &#x3bc;m.

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Osaka, Japan

Kensei Hamaki