Abstract: A method for collecting an iron-based powder includes the steps of; preparing a raw material powder containing a first metal powder containing 90% by mass or more of iron; forming a green compact by subjecting the raw material powder to uniaxial pressing using a die; machining the green compact; and collecting a second metal powder having an average particle diameter of 50 ?m or more and 500 ?m or less from machining chips generated in the step of machining.

Abstract: An iron base sintered alloy has a chemical composition including at least Fe, Cu and C, and a sintered structure including a residual austenite and a martensite. The sintered structure includes a precipitated Cu element that was dissolved in the martensite and that has been precipitated from the martensite. A method for manufacturing an iron base sintered alloy includes conducting a Cu precipitation treatment for a sintered alloy that has a chemical composition including at least Fe, Cu and C, and a sintered structure including a residual austenite and a martensite to precipitate Cu element dissolved in the martensite.

Abstract: A sintered body manufacturing method includes: a preparation step of preparing a raw material powder containing an iron-based metal powder; a molding step of subjecting the raw material powder to uniaxial pressing using a die to produce a green compact having an overall average relative density of 93% or more; a machining step of machining the green compact to produce a machined compact; and a sintering step of sintering the machined compact to obtain a sintered body.

Abstract: A soft magnetic material has an iron based powder that has an insulating coating on the surface and an ester wax. The ester wax is added in an amount not less than 0.02% by weight and not more than 0.6% by weight in relation to the soft magnetic material. Consequently, seizure between a metal mold and a material to be molded at the time of molding can be suppressed and the arising of a black residue can be prevented.

Abstract: A soft magnetic material has an iron based powder that has an insulating coating on the surface and an ester wax. The ester wax is added in an amount not less than 0.02% by weight and not more than 0.6% by weight in relation to the soft magnetic material. Consequently, seizure between a metal mold and a material to be molded at the time of molding can be suppressed and the arising of a black residue can be prevented.

Abstract: A mixed powder is obtained by adding at least one kind of solid ester wax to an iron-based powder for powder metallurgy use. The mixed powder is molded. The melting point of the ester wax is 100° C. or lower, the quantity of the ester wax added is in the range of 0.02 wt % or more to 0.6 wt % or less, and the temperature of the mold when the molding is performed is set in a range of (the melting point of the ester wax+10° C.) or more to 200° C. or less. The ester wax thereby liquefies on the surface of the mold and bleeds out when the molding is performed. As a result, molded sintered parts with complex shapes, good surface characteristics, and high densities can be easily obtained.

Abstract: This invention provides a heat-resistant, high-toughness aluminum alloy which has a good balance between strength and ductility at a temperature from room temperature to around 300 degrees C. and has a high fracture toughness, a method of manufacturing the same, and engine parts. The heat-resistant, high-toughness aluminum alloy of this invention contains 10 to 16 mass. % of silicon, 1 to 3 mass % of iron, 1 to 2 mass % of nickel, 0.5 to 2 mass % in total of one or more selected from the group consisting of titanium, zirconium, chromium and vanadium, 0.6 to 3 mass % of copper, and 0.2 to 2 mass % of magnesium, the balance being essentially aluminum, and is obtained by densifying aluminum alloy powder prepared by gas atomizing. The silicon has an average grain diameter of 4 ?m or less.

Abstract: A heat-resistant, creep-resistant aluminum alloy according to the present invention contains at least 10 mass % and not more than 30 mass % of silicon, at least 3 mass % and not more than 10 mass % of at least either iron or nickel in total, at least 1 mass % and not more than 6 mass % of at least one rare earth element in total and at least 1 mass % and not more than 3 mass % of zirconium with the rest substantially consisting of aluminum, while the mean crystal grain size of silicon is not more than 2 ?m, the mean grain size of compounds other than silicon is not more than 1 ?m, and the mean crystal grain size of an aluminum matrix is at least 0.2 ?m and not more than 2 ?m. Thus, an aluminum alloy excellent in heat resistance and creep resistance is obtained.

Abstract: A heat-resistant, creep-resistant aluminum alloy containing from 10 to 30 mass % of silicon, from 3 to 10 mass % of at least either iron or nickel in total, from 1 to 6 mass % of at least one rare earth element in total, and from 1 to 3 mass % of zirconium, preferably excluding titanium, magnesium and copper, with the rest substantially consisting of aluminum, is prepared by a method including providing a rapidly cooled aluminum alloy powder, molding the powder into a pressurized powder compact, and performing hot plastic working on the compact to form a product shape such as a billet. The compact is exposed to a temperature of at least 450° C. for at least 10 seconds and not more than 30 minutes before forming the product shape by the hot plastic working.