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, 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, 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.