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.

Abstract: A rotary cutting tool includes a tool body and a cutting edge tip provided at the tool body. At least one first groove is provided in a rake face of the cutting edge tip, the first groove has a portion inclined with respect to a rotation axis, and a front end of the first groove is provided at a front cutting edge. A rear end of the first groove is provided on an inner side with respect to an outer peripheral cutting edge, and an irregularity of the outer peripheral cutting edge is 30 ?m or less.

Abstract: A composite material includes: an iron-based alloy layer; an intermediate layer provided on the iron-based alloy layer; and a tungsten-containing layer provided on the intermediate layer, wherein the intermediate layer is composed of pure nickel or is an alloy that contains at least one selected from a group consisting of copper, cobalt, and iron at more than 0 mass % and less than or equal to 71 mass % in total, and that contains nickel at more than or equal to 29 mass % and less than 100 mass %.

Abstract: A single-crystal diamond cutting tool is provided with a flank and a rake face, a cutting edge being provided at a boundary between the flank and the rake face, an inclined surface being provided at a location distant from the cutting edge, the inclined surface being contiguous to the rake face and inclined at 0.05 degrees or more and 80 degrees or less with respect to the rake face, the rake face having a roughness Ra of 1 µm or less, the cutting edge being provided with a chamfered surface or round honing having a width of 1 µm or less, the cutting edge having projections and depressions having a width of 100 nm or less and smaller than that of the chamfered surface or round honing.

Abstract: A reamer includes a core, a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material, and a margin provided on a rear side of each the plurality of outer-circumference cutting edges in a rotational direction. A distance from an axis of rotation to a position of a center of gravity of the reamer is greater than 0.01 mm and not greater than 0.5 mm.

Abstract: Provided is a plating film containing Au and Tl, including Tl oxides including Tl2O on a surface of the plating film, a ratio of Tl atoms constituting Tl2O to a total of Tl atoms constituting the Tl oxides and Tl atoms constituting Tl simple substances on the surface being 40% or more.

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 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: Provided is a tungsten carbide powder satisfying such a condition that when the Fsss particle size thereof is represented by a (?m) and the BET particle size thereof converted from the BET specific surface area is represented by b (?m), a is 0.40 ?m or more and 1.50 ?m or less, and b/a is 0.17 or more and 0.35 or less.

Abstract: A powder containing tungsten carbide has an Fsss particle size of greater than or equal to 0.3 ?m and less than or equal to 1.5 ?m, and a content rate of the tungsten carbide of greater than or equal to 90% by mass. The powder has a crystallite size (average particle diameter) Y satisfying a relational expression of Y?0.1×X+0.20 (X: the Fsss particle size of the power containing tungsten carbide).

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 member having an excellent heat resistance is provided. The composite member includes: a substrate composed of a composite material including a non-metal phase and a metal phase; and a metal layer that covers at least a portion of a surface of the substrate, wherein a metal included in each of the metal phase and the metal layer is mainly composed of Ag, and a ratio of a content of Cu to a total content of Ag and Cu in a boundary region of the metal layer with the substrate is less than or equal to 20 atomic %.

Abstract: A composite member includes a substrate composed of a composite material containing a metal and a non-metal. One surface of the substrate has spherical warpage of which radius of curvature R is not smaller than 5000 mm and not greater than 35000 mm. A sphericity error is not greater than 10.0 ?m, the sphericity error being defined as an average distance between a plurality of measurement points on a contour of a warped portion of the substrate and approximate arcs defined by the plurality of measurement points. The substrate has a thermal conductivity not lower than 150 W/m·K and a coefficient of linear expansion not greater than 10 ppm/K.

Abstract: A super-abrasive grinding wheel includes a core and a super-abrasive grain layer provided on a surface of the core, the super-abrasive grain layer including diamond abrasive grains and CBN abrasive grains, the diamond abrasive grains and the CBN abrasive grains being fixed to the core in a single layer by a binder. The diamond abrasive grains and the CBN abrasive grains have projecting tips acting on a workpiece, the projecting tips having a variation in height of 10 ?m or less, the diamond abrasive grains having their projecting tips with irregularities of 0.1 ?m or more in height.

Abstract: A reamer includes a core, a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material, and a margin provided on a rear side of each the plurality of outer-circumference cutting edges in a rotational direction. A distance from an axis of rotation to a position of a center of gravity of the reamer is greater than 0.01 mm and not greater than 0.5 mm.

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 polycrystalline abrasive grain includes: a plurality of cBN particles; and a binder that binds the plurality of cBN particles, wherein the binder includes at least one of nitride, carbide, and carbonitride of one selected from a group consisting of a group 4a metal, a group 5a metal, and a group 6a metal in a periodic table, and a content of the binder in the polycrystalline abrasive grain is more than or equal to 5 volume % and less than or equal to 50 volume %.

Abstract: 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.