Sumitomo Electric Industries, Limited

Sumitomo Electric Sintered Alloy, Ltd.

Takayuki Tashiro

Tomoyuki Ishimine

Shigeki Egashira

Kazunari Shimauchi

Munehiro Noda

Kosuke Tominaga

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 μm or more per unit area of 100 μm×100 μm in a cross section, and a relative density is 93% or more.

Sintered material and method of manufacturing sintered material

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 2.6 times an imaginary maximum stress that is applied to an inner perimeter surface of an imaginary mold during a compacting process using the imaginary mold, the imaginary mold having an imaginary cavity that has a same area as the cavity and that has a circular perimeter shape.

Method of making sintered body, and powder compact

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.

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Osaka, Japan

Takayuki Tashiro