Abstract: A sintered gear of annular shape which has a composition including a metal, has a plurality of pores in a surface thereof, and has a relative density of 93% or more and 99.5% or less.

Abstract: A tool main body to which an insert is attachable, in which the tool main body is made of sintered metal material, and the sintered metal material includes a parent phase made of a metal and a plurality of pores present in the parent phase.

Abstract: A sintered gear of annular shape which has a composition including a metal, has a plurality of pores in a surface thereof, and has a relative density of 93% or more and 99.5% or less.

Abstract: A sintered material containing a parent phase composed of a metal and a plurality of pores present in the parent phase, wherein the pores in a cross section have an average cross-sectional area of 500 ?m2 or less, and the sintered material has a relative density in the range of 93% to 99.5%.

Abstract: A method of making a sintered body includes a step of preparing raw material powder containing powder of inorganic material, a step of producing a powder compact having a high-density portion with a relative density of 93% or more and a low-density portion with a relative density of less than 93% by compressing the raw material powder injected into a mold, a step of producing a machined compacted part by machining at least the high-density portion of the powder compact, and a step of sintering the machined compacted part to make a sintered body, wherein a perimeter shape of a cavity constituted by the mold in a cross-section perpendicular to an axial direction of the mold is such than a maximum stress applied to an inner perimeter surface of the mold during a compacting process using the mold is less than or equal to 2.

Abstract: A sintered material with a composition composed of an iron-based alloy and a structure in which the number of compound particles 0.3 ?m or more in size is less than 200 per 100 ?m×100 ?m unit area in a cross section, wherein the sintered material has a relative density of 93% or more.

Abstract: A method for manufacturing a sintered member includes a step of preparing a raw material powder containing an iron-based powder; a step of forming a green compact having a relative density of 97% or more and having a solid cylindrical shape or hollow cylindrical shape by compacting the raw material powder; and a step of sintering the green compact. The raw material powder contains at least one of a mixed powder containing pure iron powder and Ni powder and an iron alloy powder containing Ni as an additive element. The total amount of the Ni powder and Ni serving as the additive element in the raw material powder is 1 mass % or more.

Abstract: A sintered material includes a composition composed of iron-based alloy, and a texture containing 200 or more and 1350 or less of compound particles having a size of 0.3 ?m or more per unit area of 100 ?m×100 ?m in a cross section, and a relative density is 93% or more.

Abstract: A sintered material made of an iron-based alloy is provided, wherein a content of Ni is more than 0.2 mass % and 10 mass % or less in an entire iron-based alloy; a content of C is more than 0 mass % and 2.0 mass % or less in the entire iron-based alloy; at least one element selected from Mo, Mn, Cr B and Si is more than 0 mass % and 5.0 mass % or less in total in the entire iron-based alloy; and a rest of the iron-based alloy is Fe and incidental impurities. A content of Ni in a local region of the iron-based alloy is more than 0.2 mass % and less than 21 mass %. A relative density is 97% or more.

Abstract: A rare-earth magnet containing Sm, Fe, and N contains an Me and B serving as additive elements, the Me representing at least one element selected from elements in groups 4, 5, and 6 of the periodic table, and a nanocomposite microstructure including an Fe phase, a SmFeN phase, and an MeB phase, in which the SmFeN phase includes at least a Sm2Fe17Nx phase selected from the Sm2Fe17Nx phase and a SmFe9Ny phase, the volume percentage of the SmFe9Ny phase in the microstructure is 65% or less by volume, the atomic percentage of the total content of the Me and B is 0.1 at % or more and 5.0 at % or less with respect to the total amount of Sm, Fe, the Me, and B, and the atomic percentage of Fe in all phases of compounds each containing at least one of the Me and B is 20 at % or less.

Abstract: A method for producing a rare-earth magnet includes a provision step of providing a Sm—Fe-based alloy containing a SmFe9+? phase serving as a main phase by rapidly cooling a molten alloy containing Sm and Fe in an atomic ratio of 1:8.75 to 1:12, a hydrogenation-disproportionation step of subjecting the Sm—Fe-based alloy to hydrogenation-disproportionation treatment to allow part of the SmFe9+? phase (?=0.1 to 3.

Abstract: A gas decomposition apparatus having any one of the following structures: 1) a structure wherein an anode and a cathode on a solid electrolyte layer each have extended regions; the extended regions of the anode and those of the cathode are alternately extended to have a gap between the anode and the cathode; the cathode is higher in electric resistance than the anode; and a cathode electroconductive region connected electroconductively to a power source and made of an electroconductive material is extended in a direction crossing the direction in which the extended regions of the cathode are extended, thereby connecting the extended regions of the cathode electroconductively to each other; and (2) a structure which has an electroconductor layer through which the negative electrode of a power source is electroconductively connected to a cathode; and which is a structure wherein the cathode is laminated on the electroconductor layer to contact the layer, laminates each composed of a solid electrolyte layer and

Abstract: A gas decomposition apparatus having any one of the following structures: 1) a structure wherein an anode and a cathode on a solid electrolyte layer each have extended regions; the extended regions of the anode and those of the cathode are alternately extended to have a gap between the anode and the cathode; the cathode is higher in electric resistance than the anode; and a cathode electroconductive region connected electroconductively to a power source and made of an electroconductive material is extended in a direction crossing the direction in which the extended regions of the cathode are extended, thereby connecting the extended regions of the cathode electroconductively to each other; and (2) a structure which has an electroconductor layer through which the negative electrode of a power source is electroconductively connected to a cathode; and which is a structure wherein the cathode is laminated on the electroconductor layer to contact the layer, laminates each composed of a solid electrolyte layer and