Sumitomo Electric Industries, Limited

Sumitomo Electric Hardmetal Corp.

A.l.m.t. Corporation

Hitoshi Sumiya

Katsuko Yamamoto

Yoshiki Nishibayashi

Takeshi Sato

Natsuo Tatsumi

Yuh Ishida

Yutaka Kobayashi

Kazuhiro Ikeda

Keiko Arimoto

Akihiko Ueda

Shuichi Satoh

Shuji Yazu

Kazuwo Tsuji

Kensei Hamaki

Makoto Yukawa

Kazuo Nakamae

Yuichiro Seki

Shinya Uesaka

Toshiya Takahashi

Takeru Nakashima

Takeshi Satoh

Naohiro Toda

Minori Teramoto

Shuichi Sato

Bunya Suemitsu

Katsuyuki Kawate

Yasuyuki Kanada

Nobuhiro Ota

Issei Satoh

Yoshiaki Kumazawa

Nobuo Urakawa

Takuya Nohara

Junji Degawa

Ryo Toyoshima

Takuya Kinoshita

Yasushi Gouda

Jiro Katoh

Keiichi Satoh

Miki Yoshinaga

Shigetoshi Sumimoto

Kazushi Obata

A polycrystalline cubic boron nitride includes a cubic boron nitride particle group. The ratio of a second length to a first length is 0.99 or less. Here, each of the first length and the second length is a value measured on a surface of the polycrystalline cubic boron nitride with an indentation formed by a Knoop hardness test under conditions specified in ISO4545-1 and ISO4545-4. The second length represents the length of the longer diagonal of the indentation. The first length represents the sum of the second length and the length of the streaky indentation.

Polycrystalline cubic crystal boron nitride and tool

Provided are a diamond composite body capable of shortening a separation time for separating a substrate and a diamond layer, the substrate, and a method for manufacturing a diamond, as well as a diamond obtained from the diamond composite body and a tool including the diamond. The diamond composite body includes a substrate including a diamond seed crystal and having grooves in a main surface, a diamond layer formed on the main surface of the substrate, and a non-diamond layer formed on a substrate side at a constant depth from an interface between the substrate and the diamond layer.

Diamond composite body, substrate, diamond, tool including diamond, and method for manufacturing diamond

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 polycrystalline diamond having a diamond single phase as basic composition, in which the polycrystalline diamond includes a plurality of crystal grains and contains boron, hydrogen, oxygen, and the remainder including carbon and trace impurities; the boron is dispersed in the crystal grains at an atomic level, and greater than or equal to 90 atomic % of the boron is present in an isolated substitutional type; hydrogen and oxygen are present in an isolated substitutional type or an interstitial type in the crystal grains; each of the crystal grains has a grain size of less than or equal to 500 nm; and the polycrystalline diamond has a surface covered with a protective film.

Polycrystalline diamond and method for manufacturing same, scribe tool, scribe wheel, dresser, rotating tool, wire drawing die, cutting tool, electrode, and processing method using polycrystalline diamond

A diamond polycrystal includes diamond grains, the diamond polycrystal including a cubic diamond and a 6H type hexagonal diamond, wherein the cubic diamond and the 6H type hexagonal diamond exist in the same or different diamond grains, and a ratio Ab/Abis more than or equal to 0.4 and less than or equal to 1, Abrepresenting a maximum value of absorption in a range of more than or equal to 1200 cmand less than or equal to 1300 cmin an infrared absorption spectrum, Abrepresenting a maximum value of absorption in a range of more than or equal to 1900 cmand less than or equal to 2100 cm.

Diamond polycrystal, tool including diamond polycrystal, and method of producing diamond polycrystal

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

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 of producing a boron nitride polycrystal includes: a first step of obtaining a thermally treated powder by thermally treating a powder of a high pressure phase boron nitride at more than or equal to 1300&#xb0; C.; and a second step of obtaining a boron nitride polycrystal by sintering the thermally treated powder under a condition of 8 to 20 GPa and 1200 to 2300&#xb0; C.

Method of producing boron nitride polycrystal, boron nitride polycrystal, cutting tool, wear-resisting tool, and grinding tool

In a diamond polycrystal, a value of a ratio (d'/d) of d&#x2032; to d is less than or equal to 0.98 in a Vickers hardness test performed under a condition defined in JIS Z 2244:2009, where the d represents a length of a diagonal line of a first Vickers indentation formed in a surface of the diamond polycrystal when a Vickers indenter with a test load of 4.9 N is pressed onto the surface of the diamond polycrystal, and the d&#x2032; represents a length of a diagonal line of a second Vickers indentation remaining in the surface of the diamond polycrystal after releasing the test load.

Diamond polycrystal and tool including same

Provided is polycrystalline diamond having a diamond single phase as basic composition, in which the polycrystalline diamond includes a plurality of crystal grains and contains boron, at least either of nitrogen and silicon, and a remainder including carbon and trace impurities; the boron is dispersed in the crystal grains at an atomic level, and greater than or equal to 90 atomic % of the boron is present in an isolated substitutional type; the nitrogen and the silicon are present in an isolated substitutional type or an interstitial type in the crystal grains; each of the crystal grains has a grain size of less than or equal to 500 nm; and the polycrystalline diamond has a surface covered with a protective film.

Polycrystalline diamond and method for manufacturing same, scribe tool, scribe wheel, dresser, rotating tool, orifice for water jet, wire drawing die, cutting tool, electrode, and processing method using polycrystalline diamond

In a diamond polycrystal, a value of a ratio (a'/a) of a&#x2032; to a is less than or equal to 0.99 in a Knoop hardness test performed under a condition defined in JIS Z 2251:2009, where the a represents a length of a longer diagonal line of a first Knoop indentation formed in a surface of the diamond polycrystal when a Knoop indenter with a test load of 4.9 N is pressed onto the surface of the diamond polycrystal, and the a&#x2032; represents a length of a longer diagonal line of a second Knoop indentation remaining in the surface of the diamond polycrystal after releasing the test load.

Provided is a method for producing a polycrystalline diamond body, the method including a first step of heat-treating a powder of high-pressure-phase carbon at higher than or equal to 1300&#xb0; C. to obtain a heat-treated carbon powder, and a second step of sintering the heat-treated carbon powder under conditions of greater than or equal to 12 GPa and less than or equal to 25 GPa and higher than or equal to 1200&#xb0; C. and lower than or equal to 2300&#xb0; C. to obtain a polycrystalline diamond body.

Method for producing polycrystalline diamond body, polycrystalline diamond body, cutting tool, wear-resistance tool and grinding tool

A method of manufacturing a diamond by a vapor phase synthesis method includes: preparing a substrate including a diamond seed crystal; forming a light absorbing layer lower in optical transparency than the substrate by performing ion implantation into the substrate, the light absorbing layer being formed at a predetermined depth from a main surface of the substrate; growing a diamond layer on the main surface of the substrate by the vapor phase synthesis method; and separating the diamond layer from the substrate by applying light from a main surface of at least one of the diamond layer and the substrate to allow the light absorbing layer to absorb the light and cause the light absorbing layer to be broken up.

Method of manufacturing diamond, diamond, diamond composite substrate, diamond joined substrate, and tool

A wear-resistant tool includes composite polycrystalline diamond as a core, the composite polycrystalline diamond being composed of polycrystalline diamond in which particulate diamond is directly bonded and non diamond carbon. The polycrystalline diamond in the composite polycrystalline diamond is three-dimensionally continuous in composite polycrystal and primary particles have an average particle size from 10 to 500 nm.

Wear-resistant tool

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

Growing community of inventors

Itami, Japan

Hitoshi Sumiya