METHOD FOR PRODUCING MIXED POWDER FOR POWDER METALLURGY, METHOD FOR PRODUCING SINTERED COMPACT, AND SINTERED COMPACT

Title:

METHOD FOR PRODUCING MIXED POWDER FOR POWDER METALLURGY, METHOD FOR PRODUCING SINTERED COMPACT, AND SINTERED COMPACT

Document Type and Number:

WIPO Patent Application WO/2017/043094

Kind Code:

A1

Abstract:

Provided is a mixed powder for powder metallurgy with which it is possible to obtain a sintered compact that, despite not containing Ni, has an excellent tensile strength and ductility equivalent to or better than those of a sintered compact containing Ni. This method for producing a mixed powder for powder metallurgy includes: a first mixing step, in which a starting material mixed powder is obtained by mixing a Mo-containing powder and a Cu-containing powder into an iron-based powder; a diffusion/adhering step, in which a partially-diffused alloyed steel powder is obtained by diffusing and adhering the Mo and Cu onto the surface of the iron-based powder by heat-treating the starting material mixed powder; and a second mixing step, in which the mixed powder for powder metallurgy is obtained by mixing a graphite powder into the partially-diffused alloyed steel powder. The average grain diameter of the iron-based powder is 30-120 μm. A cuprous oxide powder is used as the Cu-containing powder. The component composition of the mixed powder for powder metallurgy is 0.2-1.5 mass% Mo, 0.5-4.0 mass% Cu, and 0.1-1.0 mass% C, with the remainder comprising Fe and unavoidable impurities.

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Inventors:

KOBAYASHI AKIO (JP)
NAKAMURA NAOMICHI (JP)
MAETANI TOSHIO (JP)
SONOBE AKIO (JP)
SATO ITSUYA (JP)

Application Number:

PCT/JP2016/004150

Publication Date:

March 16, 2017

Filing Date:

September 12, 2016

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

B22F1/10; B22F1/12; C22C33/02; C22C38/00; C22C38/16

Foreign References:

JPH01290702A	1989-11-22
JP2008169460A	2008-07-24
JP2004232004A	2004-08-19
JP2006283177A	2006-10-19
JP2016108651A	2016-06-20

Attorney, Agent or Firm:

SUGIMURA, Kenji (JP)

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