Abstract:
Provided are a method for producing sodium tungstate by supplying an oxidant made of sodium nitrate or sodium nitrite to bring a tungsten containing material and the oxidant into contact with each other in an atmosphere containing oxygen to thereby continuously produce a reaction product; a method for collecting tungsten using the method; and an apparatus for producing sodium tungstate. Also provided are a method for producing a sodium tungstate aqueous solution in which a reductant is introduced into a melt containing the above-described reaction product which is then dissolved in water; and a method for collecting tungsten using the method.
Abstract:
There is provided a vitrified bond super-abrasive grinding wheel having a super-abrasive grain layer, wherein the super-abrasive grain layer 6 includes a super-abrasive grain 3, a pore 5 and a vitrified bond 2, and in the super-abrasive grain layer 6, an area ratio of a coarse vitrified bond grain having an area of 30 μm2 or larger is 10% or less.
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 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 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 μm from a joining interface between the first member and the second member toward the second member side.
Abstract:
FIG. 1 is a front view of a rotary cutting tool in accordance with Embodiment 1 of the present design; FIG. 2 is a back view thereof; FIG. 3 is a right view thereof; FIG. 4 is a left view thereof; FIG. 5 is a top view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is a perspective view thereof; FIG. 8 is a partial enlarged view of portion 8 of FIG. 1; FIG. 9 is a partial enlarged view of portion 9 of FIG. 2; FIG. 10 is an enlarged left view thereof; FIG. 11 is a partial enlarged view of portion 11 of FIG. 5; FIG. 12 is a partial enlarged view of portion 12 of FIG. 6; FIG. 13 is a partial enlarged view of portion 13 of FIG. 7; FIG. 14 is a cross sectional view taken along line 14-14 of FIG. 1; FIG. 15 is a front view of a rotary cutting tool in accordance with Embodiment 2 of the present design; FIG. 16 is a back view thereof; FIG. 17 is a right view thereof, FIG. 18 is a left view thereof; FIG. 19 is a top view thereof; FIG. 20 is a bottom view thereof; FIG. 21 is a perspective view thereof; FIG. 22 is a partial enlarged view of portion 22 of FIG. 15; FIG. 23 is a partial enlarged view of portion 23 of FIG. 16; FIG. 24 is an enlarged left view thereof; FIG. 25 is a partial enlarged view of portion 25 of FIG. 19; FIG. 26 is a partial enlarged view of portion 26 of FIG. 20; FIG. 27 is a partial enlarged view of portion 27 of FIG. 21; FIG. 28 is a cross sectional view taken along line 28-28 of FIG. 15; FIG. 29 is a front view of a rotary cutting tool in accordance with Embodiment 3 of the present design; FIG. 30 is a back view thereof; FIG. 31 is a right view thereof; FIG. 32 is a left view thereof; FIG. 33 is a top view thereof; FIG. 34 is a bottom view thereof; FIG. 35 is a perspective view thereof; FIG. 36 is a partial enlarged view of portion 36 of FIG. 29; FIG. 37 is a partial enlarged view of portion 37 of FIG. 30; FIG. 38 is an enlarged left view thereof; FIG. 39 is a partial enlarged view of portion 39 of FIG. 33; FIG. 40 is a partial enlarged view of portion 40 of FIG. 34; FIG. 41 is a partial enlarged view of portion 41 of FIG. 35; and, FIG. 42 is a cross sectional view taken along line 42-42 of FIG. 29. The broken lines shown in the drawings represent portions of the rotary cutting tool that form no part of the claimed design.
Abstract:
A composite material includes a plurality of first layers and a plurality of second layers. The total number of the first and second layers is 5 or more. The first and second layers are stacked alternately in the thickness direction of the composite material, such that the first layer is located at each of the first and second surfaces. The first layers are formed from a metal material containing copper as a main component. The second layer includes a molybdenum plate and a coper filler. The molybdenum plate has first and second faces that are each an end face in the thickness direction, and a plurality of openings extending through the molybdenum plate from the first face to the second face.
Abstract:
A coated super-abrasive grain comprises: a body composed of cubic boron nitride; and a coating film coating at least a portion of a surface of the body, the body having a dislocation density of 9×1014/m2 or less, the coating film including one or more types of compounds composed of at least one type of element selected from the group consisting of a group 4 element, a group 5 element and a group 6 element of the periodic table, aluminum and silicon, and at least one type of element selected from the group consisting of oxygen, nitrogen, carbon, and boron.
Abstract:
A super-abrasive grain comprises a body composed of cubic boron nitride or diamond, and a coating film including aluminum and oxygen and coating at least a portion of a surface of the body of the abrasive grain.
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.