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Title:
SINTERED BODY PRODUCTION METHOD AND GREEN COMPACT
Document Type and Number:
WIPO Patent Application WO/2020/218069
Kind Code:
A1
Abstract:
The sintered body production method comprises: a step for preparing a raw powder containing a powder of an inorganic material; a step for loading the raw powder into a mold and compressing the same to produce a green compact having a high-density region having a relative density of 93% or higher and a low-density region having a relative density of lower than 93%; a step for machining at least the high-density region of the green compact to produce a machined compact; and a step for sintering the machined compact to obtain a sintered body. In a cross-section orthogonal to an axial direction of the mold, the circumferential edge of a cavity formed by the mold is shaped such that the maximum stress applied to an inner circumferential surface of the mold when the mold is used for molding is 2.6 times or less of the virtual maximum stress which would be applied to an inner circumferential surface of a virtual mold, which is provided with a virtual cavity having a circular circumferential edge and the same area as that of the cavity, when the virtual mold is used for molding.

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Inventors:
ISHIMINE TOMOYUKI (JP)
EGASHIRA SHIGEKI (JP)
NODA MASAHIRO (JP)
TASHIRO TAKAYUKI (JP)
SHIMAUCHI KAZUNARI (JP)
Application Number:
PCT/JP2020/016336
Publication Date:
October 29, 2020
Filing Date:
April 13, 2020
Export Citation:
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Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
SUMITOMO ELECTRIC SINTERED ALLOY LTD (JP)
International Classes:
B22F3/02; B22F3/10; B30B11/02; C22C38/00
Domestic Patent References:
WO2018216461A12018-11-29
WO2012077750A12012-06-14
Foreign References:
JPH10166188A1998-06-23
JP2006161070A2006-06-22
JP2005336608A2005-12-08
JP2007262536A2007-10-11
Other References:
GERMAN , RANDALL M. ET AL., POWDER METALLURGY SCIENCE, 25 June 1996 (1996-06-25), pages 244 - 247, ISBN: 4-7536-5091-X
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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