Title:
内燃機関用鉄基焼結合金製バルブシートおよびその製造方法
Document Type and Number:
Japanese Patent JP6827683
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an iron-based sintered alloy-made valve sheet for internal combustion engine having excellent abrasion resistance and excellent dropout resistance, and a manufacturing method therefor.SOLUTION: There is provided a valve sheet having a structure in which a tempered martensite phase having fine carbide with major axis:30 μm or less of 27 area% deposited is a matrix phase, and further hard particle in the matrix phase is dispersed with 31 to 80 area%, and a composition in which a matrix part containing the matrix phase, the hard particle or further a solid lubricant particle contains, by mass%, C:0.5 to 1.8%, further one or more kind selected from Mo, Cr, V and W of 10 to 50% as total, further one or more kind selected from Ni, Co, Cu, Si, S, Ca, F of 10 to 80% as total, and the balance Fe with inevitable impurities. Thereby, there is provided a valve sheet excellent in abrasion resistance and dropout resistance, and containing a large amount of hard particle at density:7.3 to 8.2 g/cm, radial strength:400 MPa or more.SELECTED DRAWING: None
Inventors:
Atsushi Yamamoto
Kenichi Sato
Koji Oshige
Kiyoshi Suwa
Keiyo Yamanaka
Kenichi Sato
Koji Oshige
Kiyoshi Suwa
Keiyo Yamanaka
Application Number:
JP2017081234A
Publication Date:
February 10, 2021
Filing Date:
April 17, 2017
Export Citation:
Assignee:
Nippon Piston Ring Co., Ltd.
International Classes:
B22F5/00; B22F3/10; B22F3/17; B22F3/24; B22F7/06; C22C19/07; C22C27/04; C22C33/02; C22C38/00; C22C38/24; C22C38/44; F01L3/02; F01L3/04
Domestic Patent References:
| JP2006299404A | ||||
| JP2005248234A | ||||
| JP2003166025A |
Foreign References:
| WO2014119720A1 |
Attorney, Agent or Firm:
Kenichiro Ochiai