A method of forming an article includes producing a base powder including a plurality of base particles. Each base particle includes an external surface and a first material. The method further includes removing one or more oxides from the external surface of each base particle to form a cleaned powder including a plurality of cleaned particles. Each cleaned particle includes a cleaned external surface made of the first material. The method further includes coating the cleaned external surface of each cleaned particle with a second material having a greater oxidation resistance than the first material to form a coated powder including a plurality of coated particles. Each coated particle includes an external layer including the second material that fully covers the cleaned external surface made of the first material. The method further includes forming the article using the coated powder.

The present disclosure relates to an iron-based mixed powder having excellent uniformity, fluidity and moldability by applying polyamide as a binder, and a method for manufacturing the same. The iron-based mixed powder according to an embodiment of the present disclosure is composed of a mixture of a raw material of mixed powder in which iron-based powder and additive powder are mixed, and polyamide as a binder, wherein 0.03 to 1.50 parts by weight of the binder is mixed based on 100 parts by weight of the raw material of the mixed powder.

Provided is a soft magnetic powder that can produce a dust core having excellent magnetic properties. The soft magnetic powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of Fe.sub.aSi.sub.bB.sub.cP.sub.dCu.sub.eM.sub.f, where the M is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %≤a≤84.5 at %, 0 at %≤b<6 at %, 0 at %<c≤10 at %, 4 at %<d≤11 at %, 0.2 at %≤e≤0.53 at %, 0 at %≤f≤4 at %, a+b+c+d+e+f=100 at %, a particle size is 1 mm or less, and a median of circularity of particles constituting the soft magnetic powder is 0.4 or more and 1.0 or less.

A method for producing a composite magnetic body includes: pressure molding a metal magnetic material into a predetermined shape, the metal magnetic material being an Fe—Si-based metal magnetic material; performing a primary heat treatment of heating the metal magnetic material in an atmosphere with a first oxygen partial pressure to form an Si oxide coating film on a surface of the metal magnetic material; and performing a secondary heat treatment of heating the metal magnetic material that has undergone the primary heat treatment in an atmosphere with a second oxygen partial pressure, which is higher than the first oxygen partial pressure, to form an Fe oxide layer at least partially on a surface of the Si oxide coating film.

A method for manufacturing a sintered component includes a step of making a green compact having a relative density of at least 88% by compression-molding a base powder containing a metal powder into a metallic die, a step of machining a groove part having a groove width of 1.0 mm or less in the green compact by processing groove with a cutting tool, and a step of sintering the green compact in which the groove part is formed after the step of forming the groove part.

Provided is an alloyed steel powder for powder metallurgy which has excellent compressibility and can be used to produce a sintered body that obtains improved strength simply by sintering. The alloyed steel powder for powder metallurgy contains Cu: 1.0 mass % or more and 8.0 mass % or less, Mo: more than 0.50 mass % and 2.00 mass % or less, and at least one selected from the group consisting of V: 0.05 mass % or more and 0.50 mass % or less, Nb: 0.02 mass % or more and 0.40 mass % or less, and Ti: 0.02 mass % or more and 0.40 mass % or less, with the balance consisting of Fe and inevitable impurities.

The present invention relates to a Fe-based alloy for melt-solidification-shaping containing : 0.05 mass% ≤ C ≤0.25 mass%, 0.01 mass% ≤ Si ≤ 2.0 mass%, 0.05 mass% ≤ Mn ≤ 2.5 mass%, 2.5 mass% ≤ Ni ≤ 9.0 mass%, 0.1 mass% ≤ Cr ≤ 8.0 mass%, and 0.005 mass% ≤ N ≤ 0.200 mass%, with the balance being Fe and unavoidable impurities, and satisfying: 11.5 < 15C+Mn+0.5Cr+Ni < 20.

A method for producing a composite magnetic body includes: pressure molding a metal magnetic material into a predetermined shape, the metal magnetic material being an Fe—Si-based metal magnetic material; performing a primary heat treatment of heating the metal magnetic material in an atmosphere with a first oxygen partial pressure to form an Si oxide coating film on a surface of the metal magnetic material; and performing a secondary heat treatment of heating the metal magnetic material that has undergone the primary heat treatment in an atmosphere with a second oxygen partial pressure, which is higher than the first oxygen partial pressure, to form an Fe oxide layer at least partially on a surface of the Si oxide coating film.

The iron alloy particle is a particle including an iron alloy. The particle includes multiple mixed-phase particles, each including nanocrystals of 10 nm or more and 100 nm or less (i.e., from 10 nm to 100 nm) in crystallite size and an amorphous phase; and a grain boundary layer between the mixed-phase particles. Also, the iron alloy has a composition containing Fe, Si, P, B, C, and Cu.

The iron alloy particle is a particle including an iron alloy. The particle includes multiple mixed-phase particles, each including nanocrystals of 10 nm or more and 100 nm or less (i.e., from 10 nm to 100 nm) in crystallite size and an amorphous phase; and a grain boundary layer between the mixed-phase particles. Also, the iron alloy has a composition containing Fe, Si, P, B, C, and Cu.