HIGHLY WEAR-RESISTANT VALVE SEAT FOR USE IN INTERNAL COMBUSTION ENGINE AND MANUFACTURING METHOD THEREFOR

Title:

HIGHLY WEAR-RESISTANT VALVE SEAT FOR USE IN INTERNAL COMBUSTION ENGINE AND MANUFACTURING METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2014/119720

Kind Code:

A1

Abstract:

A highly wear-resistant valve seat for use in an internal combustion engine is provided. A feedstock powder for forming a valve-contacting-side layer is obtained by mixing an iron powder, a hard-particle powder, and a graphite powder. Said feedstock powder may also contain an alloy-element powder and/or a solid-lubricant-particle powder. The feedstock powder is formulated such that after sintering, a base part contains 0.3-2.0 mass% carbon and a total of up to 70 mass% of one or more of the following elements, with the remainder comprising iron and unavoidable impurities: cobalt, silicon, nickel, molybdenum, chromium, manganese, sulfur, tungsten, and vanadium. Some or all of the hard-particle powder has a mean particle diameter between 15 and 50 µm, inclusive, and the iron powder also has a mean particle diameter between 15 and 50 µm, inclusive, such that after sintering, the structure of the base part is such that hard particles constitute 10-65% of the total mass of the valve-contacting-side layer and are dispersed with a density of at least 1,000 particles/mm2. This makes it possible to uniformly disperse a hard-particle phase throughout a base phase of a sintered body, yielding an iron-based sintered valve seat that exhibits excellent wear resistance and strength.

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JP4013395	Iron-based mixed powder for high-strength sintered parts
JPH108184	PRODUCTION OF TETRA-IRON NITRIDE MAGNETIC MATERIAL

Inventors:

IKEMI SATOSHI (JP)
OSHIGE HIROSHI (JP)
SATO KENICHI (JP)

Application Number:

PCT/JP2014/052241

Publication Date:

August 07, 2014

Filing Date:

January 31, 2014

Export Citation:

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Assignee:

NIPPON PISTON RING CO LTD (JP)

International Classes:

C22C33/02; B22F1/052; B22F1/105; B22F7/00; C22C30/00; C22C38/00; F01L3/02

Foreign References:

JP2005248234A	2005-09-15
JPH05202451A	1993-08-10
JP2008030071A	2008-02-14

Attorney, Agent or Firm:

OCHIAI KENICHIRO (JP)
Ken-ichiro Ochiai (JP)

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