Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Industries, Limited

A.l.m.t. Corporation

Akihiko Ueda

Yoshiki Nishibayashi

Yutaka Kobayashi

Satoru Kukino

Hitoshi Sumiya

Natsuo Tatsumi

Takuya Nohara

Takahiro Imai

Yoshiyuki Yamamoto

Katsumi Okamura

Akito Ishii

Machiko Abe

Michiko Matsukawa

Hisaya Hama

Yuichiro Watanabe

Yoshinori Tanigawa

Yoshiki Asakawa

Takashi Harada

Hironari Moroguchi

Yuichiro Seki

Toshiya Takahashi

Mayuka Segawa

Hirotsugu Iwasaki

Naoki Watanobe

Kiichi Meguro

Nozomi Tsukihara

Gaku Harada

Soichiro Kakinoki

Keita Miyamoto

Makoto Yukawa

Kei Hirai

Bunya Suemitsu

Takuya Kinoshita

Yuki Tsutsumiuchi

Kento Yamada

Shigetoshi Sumimoto

A diamond sintered material includes diamond grains, wherein a content ratio of the diamond grains is more than or equal to 80 volume % and less than or equal to 99 volume % with respect to the diamond sintered material, an average grain size of the diamond grains is more than or equal to 0.1 μm and less than or equal to 50 μm, and a dislocation density of the diamond grains is more than or equal to 8.1×10mand less than 1.0×10m.

Diamond sintered material and tool including diamond sintered material

There is provided a diamond cutting tool including a cutting edge portion containing single crystal diamond or binderless polycrystalline diamond and graphite, wherein when Raman spectroscopy is performed on a surface of the cutting edge portion, a ratio R1 of Ig1 to a sum of Id1 and the Ig1 is equal to or more than 0.5 and equal to or less than 1, where the Id1 represents a peak intensity of first carbon in the surface, the Ig1 represents a peak intensity of second carbon in the surface, the first carbon represents carbon that forms the single crystal diamond or the binderless polycrystalline diamond.

Diamond cutting tool and method for manufacturing the same

A diamond sintered material includes diamond grains, wherein a content ratio of the diamond grains is more than or equal to 80 volume % and less than or equal to 99 volume % with respect to the diamond sintered material, an average grain size of the diamond grains is more than or equal to 0.1 μm and less than or equal to 50 μm, and a dislocation density of the diamond grains is more than or equal to 1.2×10mand less than or equal to 5.4×10m.

A cutting tool comprises a substrate and a coating film disposed on the substrate, wherein the coating film comprises a first layer and a second layer; the first layer has a hardness Hof 25 GPa or more and 40 GPa or less; the second layer has a hardness Hsatisfying 0.5×H≤H≤0.9×H; and at least one of a ratio I/(I+I+I) of Iof (200) plane to a sum of X-ray diffraction intensity Iof (200) plane, X-ray diffraction intensity Iof (111) plane, and X-ray diffraction intensity Iof (220) plane of the coating film, a ratio I/(I+I+I) of Ito the sum, and a ratio I/(I+I+I) of Ito the sum is 0.45 or more.

Cutting tool

A drill includes a blade tip part that is formed of diamond and a trunk part that is formed of diamond and is continuous with the blade tip part, the drill rotating about a drill axis, the blade tip part includes N cutting edges where N is an integer of no less than 4, and a proportion of Sto Sis no less than 30% and no more than 60%, where Sis an area of the drill in a cross-section with the drill axis as a normal line, the cross-section including a boundary between the blade tip part and the trunk part, r is a maximum value of a distance from the drill axis to an outer edge of the drill in the cross-section and Sis an area of a circle with r as a radius.

Drill

A single-crystal diamond includes n types of regions different in total concentration of an impurity, the n types of regions being observed in an observed surface being in parallel to a (110) face. Each of the n types of regions has an area not smaller than 0.1 μm. At least one of a first line, a second line, and a third line on the observed surface crosses a boundary between the n types of regions at least four times. The first line, the second line, and the third line are in parallel to a <−110> direction and have a length of 1 mm. A midpoint of the first line corresponds to the center of gravity of the observed surface. The second line and the third line are distant from the first line by 300 μm in a <001> direction and a <00−1> direction, respectively.

Single-crystal diamond and method of manufacturing the same

A cubic boron nitride sintered material includes cubic boron nitride and a binder. The binder includes a first material and a second material. The first material is one or two or more first chemical species each including at least one first metallic element selected from the group consisting of tungsten, cobalt, and aluminum. Each of the first chemical species is a metal, an alloy, an intermetallic compound, a compound, or a solid solution. The second material is one or two or more second chemical species each including at least one second metallic element selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, and chromium. Each of the second chemical species is a solid solution derived from at least one selected from the group consisting of nitride, carbide, and carbonitride. In each of the second chemical species, 0.1 atom % to 10 atom % of aluminum is dissolved.

Cubic boron nitride sintered material and cutting tool including same

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.

Cubic boron nitride sintered material

A cubic boron nitride sintered material comprises cubic boron nitride particles and a bonding material, wherein the bonding material comprises at least one first metallic element selected from the group consisting of titanium, zirconium, vanadium, niobium, hafnium, tantalum, chromium, rhenium, molybdenum, and tungsten; cobalt; and aluminum; the cubic boron nitride sintered material has a first interface region sandwiched between an interface between the cubic boron nitride particles and the bonding material, and a first virtual line passing through a point 10 nm apart from the interface to the bonding material side; and when an element that is present at the highest concentration among the first metallic elements in the first interface region is defined as a first element, an atomic concentration of the first element in the first interface region is higher than an atomic concentration of the first element in the bonding material excluding the first interface region.

A turning tool includes: a holder portion; and a cutting edge portion fixed to the holder portion, wherein the cutting edge portion is composed of a synthetic single-crystal diamond, and the cutting edge portion has a nose curvature having a curvature radius of more than or equal to 0.1 mm and less than or equal to 1.2 mm, and the nose curvature satisfies at least one of a condition that a direction of a line of intersection between the rake face and a bisecting cross section of a vertex angle of the nose curvature is within ±10° relative to a <110> direction of the synthetic single-crystal diamond, and a condition that the direction of the line of intersection between the rake face and the bisecting cross section of the vertex angle of the nose curvature is within ±10° relative to a <100> direction of the synthetic single-crystal diamond.

Turning tool

A cBN sintered material comprising cBN particles and a binder phase, in which the binder phase contains AlN and AlB, a content proportion of cBN particles is 70 to 97 vol %, cBN sintered material has a volume resistivity up to 5&#xd7;10&#x3a9;cm, a rate of a peak intensity derived from Al with respect to a peak intensity derived from cBN particles is less than 1.0%, cBN particles include fine particles and coarse particles, coarse particles optionally include ultra-coarse particles, with respect to the entire cBN particles, a content proportion &#x3b1; of fine particles is from 10 vol %, a content proportion &#x3b2; of coarse particles is from 30 vol %, a content proportion &#x3b3; of ultra-coarse particles is 25 vol % or less, and a total of the content proportion &#x3b1; of fine particles and the content proportion &#x3b2; of coarse particles is 50 to 100 vol %.

Cubic boron nitride sintered material, tool comprising cubic boron nitride sintered material and method for manufacturing cubic boron nitride sintered material

The cubic boron nitride sintered material is a cubic boron nitride sintered material comprising: cubic boron nitride particles in an amount of 70 vol % or more and less than 100 vol %, and a bonding material, wherein the bonding material includes an aluminum compound, and includes cobalt as a constituent element; the cubic boron nitride sintered material has a first region in which a space between adjacent cubic boron nitride particles is 0.1 nm or more and 10 nm or less; and when the first region is analyzed by using an energy dispersive X-ray analyzer equipped with a transmission electron microscope, the atom % of aluminum in the first region is 0.1 or more.

Cutting edge for drilling tool

A diamond die includes a diamond provided with a hole for drawing a wire material, the diamond being a CVD single-crystal diamond, an axis of the hole being inclined relative to a normal direction of a crystal plane of the diamond.

Growing community of inventors

Itami, Japan

Akihiko Ueda