Abstract: There is provided a tool for friction stir welding, which is capable of promoting temperature rise of materials to be joined during joining to achieve friction stir welding in a short time, is excellent in heat insulating property of a coating layer, and is excellent in oxidation resistance and wear resistance. A tool for friction stir welding according to the present invention is a tool for friction stir welding including a base material and a coating layer formed on the base material, wherein the coating layer is formed of one or more layers, and at least one layer of the coating layer has a thermal permeability of 5000 J/s0.5·m2·K or less.

Abstract: A friction stir welding tool of the present invention is used for friction stir welding, and includes: a base material; and a coating layer formed on a surface of at least a portion of the base material that is to be caused to contact workpieces during friction stir welding, the coating layer containing cubic WC1-x.

Abstract: There is provided a tool for friction stir welding, which is capable of promoting temperature rise of materials to be joined during joining to achieve friction stir welding in a short time, is excellent in heat insulating property of a coating layer, and is excellent in oxidation resistance and wear resistance. A tool for friction stir welding according to the present invention is a tool for friction stir welding including a base material and a coating layer formed on the base material, wherein the coating layer is formed of one or more layers, and at least one layer of the coating layer has a thermal permeability of 5000 J/s0.5·m2·K or less.

Abstract: There is provided a tool for friction stir welding having excellent wear resistance and chipping resistance. The tool for friction stir welding according to the present invention is a tool for friction stir welding used in friction stir welding processing, wherein the tool for friction stir welding includes a base material, the base material includes a first hard phase and a binder phase, and has a thermal conductivity of 45 W/m·K or less, the first hard phase is formed by WC particles, and the binder phase is formed by an iron group metal and is included in the base material at a volume ratio of 8% by volume or more and 28% by volume or less.

Abstract: There is provided a tool for friction stir welding, in which a coating layer is less likely to peel off from a base material and excellent wear resistance is achieved. The tool for friction stir welding according to the present invention includes a base material (BM) and a coating layer. The BM includes a first hard phase (FP) formed by WC particles, a second hard phase (SP) and a binder phase (BP). The SP is formed by a compound of one or more metals selected from Ti, Zr, Hf, Nb, Ta, Cr, Mo, and W and one or more elements selected from nitrogen, carbon, boron, and oxygen, and is included in the BM at a volume ratio of 3% to 30%. The BP is included in the BM at a volume ratio of 8% to 28%. The FP is higher than the SP in terms of volume ratio.

Abstract: There is provided a tool for friction stir welding having excellent wear resistance and chipping resistance. The tool for friction stir welding according to the present invention includes a base material, the base material includes a first hard phase, a second hard phase and a binder phase, the first hard phase is formed by WC particles, the second hard phase is formed by a compound of one or more metals selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W and one or more elements selected from the group consisting of nitrogen, carbon, boron, and oxygen, or a solid solution of the compound (except for WC), the binder phase is formed by an iron group metal, and the second hard phase is higher than or identical to the first hard phase in terms of volume ratio.

Abstract: A friction stir welding tool is provided which allows for excellent wear resistance and high joining strength even in a process of joining difficult-joining materials. A friction stir welding tool of the present invention is used for a friction stir welding process and includes a base material. The base material includes a hard phase and a binder phase. The hard phase includes TiCN. The binder phase is made of an iron group metal. A mass ratio Bs of the binder phase to the base material in a region having a thickness of 20 ?m from a surface of the base material is smaller than a mass ratio Bi of the binder phase to the base material in a region beyond the thickness of 20 ?m from the surface of the base material.

Abstract: There is provided a tool for friction stir welding, which is capable of promoting temperature rise of materials to be joined during joining to achieve friction stir welding in a short time, is excellent in heat insulating property of a coating layer, and is excellent in oxidation resistance and wear resistance. A tool for friction stir welding according to the present invention is a tool for friction stir welding including a base material and a coating layer formed on the base material, wherein the coating layer is formed of one or more layers, and at least one layer of the coating layer has a thermal permeability of 5000 J/s0.5·m2·K or less.

Abstract: An amorphous hard carbon film comprising a first amorphous carbon layer substantially consists only of carbon formed on a substrate surface and a second amorphous carbon layer substantially consists only of carbon formed on the surface of the first amorphous carbon layer, wherein the transmission electron microscope image of the first amorphous carbon layer is brighter than that of the second amorphous carbon layer when the cross section is observed.

Abstract: An amorphous hard carbon film comprising a first amorphous carbon layer substantially consists only of carbon formed on a substrate surface and a second amorphous carbon layer substantially consists only of carbon formed on the surface of the first amorphous carbon layer, wherein the transmission electron microscope image of the first amorphous carbon layer is brighter than that of the second amorphous carbon layer when the cross section is observed.

Abstract: An amorphous carbon film is provided with a density of 2.8-3.3 g/cm3. It would be preferable for the film to have: a spin density of 1×1018-1×1021 spins/cm3; a carbon concentration of at least 99.5 atomic percentage; a hydrogen concentration of no more than 0.5 atomic percentage; an inert gas element concentration of no more than 0.5 atomic percentage; and a Knoop hardness of 3000-7000. A mixed layer with a thickness of at least 0.5 nm and no more than 10 nm is formed from a parent material and at least material selected from: B, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W. An amorphous carbon film is disposed on the mixed layer or a metallic intermediate layer formed on the mixed layer, thereby increasing adhesion. This amorphous carbon film is formed with solid carbon using sputtering, cathode-arc ion plating, or laser abrasion.

Abstract: An amorphous carbon film is provided with a density of 2.8-3.3 g/cm3. It would be preferable for the film to have: a spin density of 1×1018-1×1021 spins/cm3; a carbon concentration of at least 99.5 atomic percentage; a hydrogen concentration of no more than 0.5 atomic percentage; an inert gas element concentration of no more than 0.5 atomic percentage; and a Knoop hardness of 3000-7000. A mixed layer with a thickness of at least 0.5 nm and no more than 10 nm is formed from a parent material and at least material selected from: B, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W. An amorphous carbon film is disposed on the mixed layer or a metallic intermediate layer formed on the mixed layer, thereby increasing adhesion. This amorphous carbon film is formed with solid carbon using sputtering, cathode-arc ion plating, or laser abrasion.

Abstract: Disclosed is a shim or a valve lifter for an automotive engine valve driving system that slides against a cam lobe of a camshaft to drive an intake/exhaust valve of an internal combustion engine. The shim or lifter has the top of a sliding surface thereof opposing the cam lobe and being coated with a hard carbon film. The hard carbon film has a surface hardness of 1500 to 4500 kg/mm2 in terms of Knoop hardness, a thickness of 0.3 to 2.0 ?m and a surface roughness Ry (?m) satisfying the following equation (A): Ry<{(0.75?Hk/8000)×h+0.07/0.8}??(A) where h is the thickness (?m) of the hard carbon film; and Hk is the knoop hardness (kg/mm2) of the hard carbon film. By imparting durability, reliability and a low friction coefficient to the hard carbon film that is said to be low in ductility to prevent the hard carbon film from becoming cracked and separated when applied to the sliding portion.

Abstract: Amorphous carbon coated tools include substrates formed from a cubic boron nitride sintered body, a diamond sintered body, a silicon nitride sintered body, or an aluminum oxide-titanium carbide sintered body, and amorphous carbon films thereon to make the cutting edges of the tools. The amorphous carbon films contain hydrogen at 5 atomic percent or below and have a maximum thickness of 0.05 ?m to 0.5 ?m on the cutting edges. The amorphous carbon films are most suitable for applications to cutting tools exemplified by cutters, knives, and slitters, and to indexable inserts used for example in turning tools including drills, endmills, and reamers, and milling cutters.

Abstract: An amorphous carbon coated tool includes a base material of WC base cemented carbide, and an amorphous carbon film formed on this base material. The cobalt content in the base material is at least 12% by mass. The maximum thickness of the amorphous carbon film is at least 0.05 ?m and not more than 0.5 ?m at the cutting edge. The amorphous carbon film is deposited with graphite as the source material by physical vapor deposition in an atmosphere substantially absent of hydrogen. The amorphous carbon film coated tool superior in wear resistance and adhesion resistance is preferably applicable to rotating tools such as drills, end mills and reamers, indexable inserts used for milling cutters and turning tools, and cutting-off tools such as cutters, knives, or slitters.

Abstract: For machine parts, cutting tools and molds used under extremely high contact pressures, an amorphous carbon film is provided which has a sufficient adhesion to a substrate. The amorphous carbon covered member has an interlayer comprising at least one element selected from the group consisting of elements in the IVa, Va, VIa and IIIb groups and the IVb group except carbon in the periodic table, or a carbide of at least one element selected from the group, and an amorphous carbon film formed on the interlayer. The interlayer has a thickness of 0.5 nm or over and less than 10 nm.

Abstract: Disclosed is a shim or a valve lifter for an automotive engine valve driving system that slides against a cam lobe of a camshaft to drive an intake/exhaust valve of an internal combustion engine. The shim or lifter has the top of a sliding surface thereof opposing the cam lobe and being coated with a hard carbon film. The hard carbon film has a surface hardness of 1500 to 4500 kg/mm2 in terms of Knoop hardness, a thickness of 0.3 to 2.

Abstract: Amorphous carbon coated tools having excellent wear-resistant and anti-adhesion features and methods of producing the same are provided.

Abstract: An amorphous carbon coated tool includes a base material of WC base cemented carbide, and an amorphous carbon film formed on this base material. The cobalt content in the base material is at least 12% by mass. The maximum thickness of the amorphous carbon film is at least 0.05 &mgr;m and not more than 0.5 &mgr;m at the cutting edge. The amorphous carbon film is deposited with graphite as the source material by physical vapor deposition in an atmosphere substantially absent of hydrogen. The amorphous carbon film coated tool superior in wear resistance and adhesion resistance is preferably applicable to rotating tools such as drills, end mills and reamers, indexable inserts used for milling cutters and turning tools, and cutting-off tools such as cutters, knives, or slitters.

Abstract: For machine parts, cutting tools and molds used under extremely high contact pressures, an amorphous carbon film is provided which has a sufficient adhesion to a substrate. The amorphous carbon covered member has an interlayer comprising at least one element selected from the group consisting of elements in the IVa, Va, VIa and IIIb groups and the IVb group except carbon in the periodic table, or a carbide of at least one element selected from the group, and an amorphous carbon film formed on the interlayer. The interlayer has a thickness of 0.5 nm or over and less than 10 nm.