Jfe Steel Corporation

Masato Oya

Shigeru Unami

Provided is a powder mixture for powder metallurgy that has excellent fluidity, can be ejected from a green compacting die with little force, and can suppress die galling in forming. The powder mixture comprises: a raw material powder; a copper powder; a binder; a graphite powder; and carbon black. The raw material powder contains an iron-based powder in an amount of 90 mass % or more with respect to the raw material powder. An average particle size of the graphite powder is less than 5 μm. Additive amounts of the binder, the graphite powder, the copper powder, and the carbon black are in specific ranges. A surface of the raw material powder is coated with at least part of the binder. A surface of the binder is coated with at least part of the graphite powder, at least part of the copper powder, and at least part of the carbon black.

Powder mixture for powder metallurgy and method for producing powder mixture for powder metallurgy

The powder mixture for powder metallurgy includes a raw material powder, a binder, and a graphite powder, where the raw material powder contains an iron-based powder in a content of 90 mass % or more of the raw material powder, the graphite powder has an average particle size of less than 5 &#x3bc;m, a ratio in mass of the binder to the sum the raw material powder and the graphite powder is 0.10 mass % to 0.80 mass %, a ratio of mass of the graphite powder to the sum of mass of the raw material powder and mass of the graphite powder is 0.6 mass % to 1.0 mass %, surface of the raw material powder is covered with at least a part of the binder, and surface of the binder covering the surface of the raw material powder is covered with at least a part of the graphite powder.

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Tokyo, Japan

Masato Oya