Abstract: A tungsten-containing material that has an oxygen generation quantity of more than 1 ppm and 20 ppm or less at 2100° C. to 2300° C. as detected by oxygen analysis based on an oxygen separation method, and contains 5 ppm or more and 30 ppm or less of potassium.

Abstract: A rotary dresser has a super-abrasive grain layer including super-abrasive grains bonded in a single layer to a base metal by a plated layer, in which the super-abrasive grains include first super-abrasive grains having a first average grain diameter, and second super-abrasive grains having a second average grain diameter smaller than the first average grain diameter, a plurality of super-abrasive grains exposed at a surface of the super-abrasive grain layer among the first super-abrasive grains and the second super-abrasive grains have working surfaces formed thereon, and in a region with a highest degree of concentration of the super-abrasive grains, a ratio of a total area of the plurality of working surfaces to an area of an imaginary surface smoothly connecting the plurality of working surfaces is 30% or more and 60% or less.

Abstract: A wire drawing die 1 includes a non-diamond material, is provided with a die hole 1h, and has a reduction 1c and a bearing 1d that is positioned downstream of the reduction 1c. A reduction angle ? which is an opening angle of the die hole 1h at the reduction 1c is less than or equal to 17°, and a surface roughness Ra of the die hole 1h within ±20 ?m from a specific position inside the bearing 1d in a circumferential direction of the die hole 1h that is perpendicular to a wire drawing direction is less than or equal to 0.025 ?m.

Abstract: A composite material contains a metallic phase, a non-metallic phase and a specific element. At least 90 mass % of the metallic phase is composed of at least one selected from the group consisting of Ag and Cu. The non-metallic phase includes a coated core material. The coated core material includes a core material and a carbide layer that covers at least a part of a surface of the core material. The core material contains at least one carbon-containing material selected from the group consisting of diamond, graphite, carbon fibers, and silicon carbide. The carbide layer contains a carbide of at least one metal element selected from the group consisting of Ti, Cr, Ta, and V. The specific element is at least one selected from the group consisting of Y and Mg. A total content of the specific element is 0.0004 mass % to 1.3 mass %.

Abstract: A composite material of the present disclosure contains a plurality of diamond particles, copper, and at least one first element selected from the group consisting of silicon, chromium, cobalt, nickel, molybdenum, titanium, vanadium, niobium, tantalum tungsten and aluminum, wherein the content rate of the first element based on the total mass of the copper and the first element is 50 ppm or higher and 2,000 ppm or lower.

Abstract: There is provided an irregularly-shaped diamond die for producing an irregularly-shaped wire, wherein a processing hole is provided, the processing hole having a reduction portion and a bearing portion in this order from an upstream side in a wire drawing direction, a corner portion having a curved shape and a non-corner portion located at a position different from a position of the corner portion are provided in a cross section of the bearing portion perpendicular to the wire drawing direction, and a surface roughness of the corner portion is greater than a surface roughness of the non-corner portion. The surface roughness Sa of the corner portion is equal to or less than 0.30 ?m and the surface roughness Sa of the non-corner portion is equal to or less than 0.20 ?m.

Abstract: A heat radiation member excellent in electrical insulation and better in thermal conduction is provided. The heat radiation member includes a substrate composed of a composite material containing diamond and a metallic phase, an insulating plate provided on at least a part of front and rear surfaces of the substrate and composed of an aluminum nitride, and a single bonding layer interposed between the substrate and the insulating plate, the heat radiation member having thermal conductivity not lower than 400 W/m·K.

Abstract: A composite material has a plate shape and has a first surface and a second surface. The second surface is opposite to the first surface. The composite material includes a plurality of first layers and at least one second layer. The first layers and the second layer are alternately layered along a thickness direction of the composite material such that the first layers are located at the first surface and the second surface. Each of the first layers is a layer including copper. The second layer is a layer of a molybdenum powder compact impregnated with copper. A compressive residual stress of 50 MPa or less acts on each of the first layer located at the first surface and the first layer located at the second surface.

Abstract: A rotary cutting tool includes a first cutting blade, a second cutting blade, a third cutting blade, a fourth cutting blade, and a fifth cutting blade on a circumference, in which a rotation angle from the first cutting blade to the second cutting blade is 60±1°, a rotation angle from the second cutting blade to the third cutting blade is 75±1°, a rotation angle from the third cutting blade to the fourth cutting blade is 60±1°, a rotation angle from the fourth cutting blade to the fifth cutting blade is 75±1°, and a rotation angle from the fifth cutting blade to the first cutting blade is 90±1°.

Abstract: A composite material includes: a first member containing tungsten as a primary component; a second member containing copper as a primary component, the second member being joined to the first member; and a metal containing at least one metal selected from a group consisting of titanium, zirconium, and hafnium, the metal being present in the second member, wherein a concentration of the metal is more than 0 atomic % and less than or equal to 5.0 atomic % at a location of 5 ?m from a joining interface between the first member and the second member toward the second member side.

Abstract: In a case where an FSSS average particle size of a tungsten-containing powder as obtained by an FSSS method is defined as a (?m) and a density TD, which is an inverse number of a tap volume of the tungsten-containing powder, is defined as p (g/cm3), a relational expression of p?0.37a+7.04 is satisfied when a range of the FSSS average particle size a is 0.5 ?m?a?5.0 ?m.

Abstract: A composite member excellent in corrosion resistance of a substrate and excellent in heat radiation property is provided. A composite member includes a substrate composed of a composite material containing magnesium or a magnesium alloy and SiC and a coating layer provided on a surface of the substrate. The coating layer includes an outermost layer provided as an outermost surface and an intermediate layer provided directly under the outermost layer. The outermost layer contains nickel and phosphorus. The intermediate layer is mainly composed of copper. The intermediate layer has a thickness not smaller than 30 ?m.

Abstract: An abrasive tool has an abrasive grain layer comprising a plurality of hard abrasive grains bonded by a binder, with a plurality of the hard abrasive grains each having a working surface formed to contact a workpiece, a ratio of a total area of a plurality of such working surfaces to an area of an imaginary plane smoothly connecting the plurality of working surfaces being 5% or more and 30% or less.

Abstract: A reamer incudes a core and a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material. The core extends from a front end to a rear end. The core is provided with a plurality of flutes from the front end to the rear end. A center-of-gravity adjustment portion, which adjusts a distance from a center of rotation to a center of gravity, is provided at least partially from terminal ends of the plurality of flutes on a rear end side to the rear end of the core. The center-of-gravity adjustment portion causes the deviation of the center of gravity from the center of rotation to be smaller than when no center-of-gravity adjustment portion is provided.

Abstract: A wire drawing die 1 includes a non-diamond material, is provided with a die hole 1h, and has a reduction 1c and a bearing 1d that is positioned downstream of the reduction 1c. A reduction angle ? which is an opening angle of the die hole 1h at the reduction 1c is less than or equal to 17°, and a surface roughness Ra of the die hole 1h within ±20 ?m from a specific position inside the bearing 1d in a circumferential direction of the die hole 1h that is perpendicular to a wire drawing direction is less than or equal to 0.025 ?m.

Abstract: A reamer incudes a core and a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material. The core extends from a front end to a rear end. The core is provided with a plurality of flutes from the front end to the rear end. A center-of-gravity adjustment portion, which adjusts a distance from a center of rotation to a center of gravity, is provided at least partially from terminal ends of the plurality of flutes on a rear end side to the rear end of the core. The center-of-gravity adjustment portion causes the deviation of the center of gravity from the center of rotation to be smaller than when no center-of-gravity adjustment portion is provided.

Abstract: A ratio of an angle of 2 to 15° is 50% or more in an arbitrary surface of the tungsten material, the angle being formed between a specific crystal orientation of a first crystal grain and a specific crystal orientation of a second crystal grain adjacent to the first crystal grain.

Abstract: There is provided a vitrified bond super-abrasive grinding wheel including: a core; and a super-abrasive grain layer provided on the core, wherein the super-abrasive grain layer includes a plurality of super-abrasive grains and a vitrified bond that joins the plurality of super-abrasive grains, and the vitrified bond has a plurality of bond bridges located between the plurality of super-abrasive grains to join the plurality of super-abrasive grains, not less than 80% of the plurality of super-abrasive grains are joined to the super-abrasive grains adjacent thereto by the bond bridges, and not less than 90% of the plurality of bond bridges in a cross section of the super-abrasive grain layer have a thickness equal to or smaller than an average grain size of the super-abrasive grains, and have a length greater than the thickness.

Abstract: A composite member includes: a substrate formed of a composite material containing a plurality of diamond grains and a metal phase; and a coating layer made of metal. The surface of the substrate includes a surface of the metal phase, and a protrusion formed of a part of at least one diamond grain of the diamond grains and protruding from the surface of the metal phase. In a plan view, the coating layer includes a metal coating portion, and a grain coating portion. A ratio of a thickness of the grain coating portion to a thickness of the metal coating portion is equal to or less than 0.80. The coating layer has a surface roughness as an arithmetic mean roughness Ra of less than 2.0 ?m.