Title:
IRON-BASED SINTERED ALLOY VALVE SEAT FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2023/002986
Kind Code:
A1
Abstract:
Provided is an iron-based sintered alloy valve seat having excellent wear resistance. The present invention provides an iron-based sintered alloy valve seat for an internal combustion engine, wherein: Si-Cr-Ni-Fe-based and Mo-based intermetallic compound particles that have a hardness of 700-1300 HV in terms of the Vickers hardness and that have a composition containing, in terms of mass%, 1.5-3.5% of Si, 7.0-9.0% of Cr, 35.0-45.0% of Mo, and 5.0-20.0% of Ni, with the remainder consists of Fe and inevitable impurities are dispersed in a base phase as hard particles; and a base part containing the base phase, the hard particles, solid lubricant particles, etc. has a composition containing, in terms of mass%, 0.5-2.0% of C, 0.2-2.0% of Si, 5% or less of Mn, 0.5-15% of Cr, 3-20% of Mo, and 1-10% of Ni and additionally containing 0-5% of V, 0-10% of W, 0-2% of S, and 0-5% of Cu, with the remainder consists of Fe and inevitable impurities. Accordingly, the occurrence of cracks and chips in the hard particles is avoided even with a composition that does not contain Co, and thus, it is possible to prevent wear resistance deterioration and to obtain a valve seat having wear resistance that is equivalent to or greater than the case in which a conventional Co-containing composition is employed.
Inventors:
NAGAOKA YUJI (JP)
IKEMI SATOSHI (JP)
SATO KATSUAKI (JP)
IKEMI SATOSHI (JP)
SATO KATSUAKI (JP)
Application Number:
PCT/JP2022/028064
Publication Date:
January 26, 2023
Filing Date:
July 19, 2022
Export Citation:
Assignee:
NIPPON PISTON RING CO LTD (JP)
International Classes:
B22F5/10; B22F5/00; B22F7/00; C22C27/04; C22C38/00; C22C38/60; F01L3/02
Foreign References:
| JP2003119542A | 2003-04-23 | |||
| JP2016216762A | 2016-12-22 | |||
| JP2016060922A | 2016-04-25 |
Attorney, Agent or Firm:
OCHIAI Kenichiro (JP)
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