Title:
SINTERED VALVE GUIDE AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2019/163937
Kind Code:
A1
Abstract:
Provided are: a sintered valve guide which has high strength and exhibits excellent wear resistance and machinability; and a method for producing this sintered valve guide. A sintered valve guide according to the present invention has a matrix and pores that are dispersed in the matrix. The matrix is composed of a pearlite single phase structure or a mixed structure of ferrite and pearlite, in which martensite phases are dispersed. The abundance of the martensite phases is set such that the area ratio of the martensite phases in a cross-section of the structure is 1-10% of the matrix. According to the present invention, a mixed powder which is obtained by adding a copper-phosphorus alloy powder, a nickel powder and a graphite powder into an iron powder such that the mass ratio of the copper-phosphorus alloy powder is 1.0-6.0%, the mass ratio of the nickel powder is 0.1-3.0% and the mass ratio of the graphite powder is 0.5-1.5% is formed into a molded body such that the molded body has a density of 6.8-7.2 Mg/m3; and the thus-obtained molded body is sintered at a temperature of 950-1,200°C.
Inventors:
FUKAE DAISUKE (JP)
KAWATA HIDEAKI (JP)
KAWATA HIDEAKI (JP)
Application Number:
PCT/JP2019/006746
Publication Date:
August 29, 2019
Filing Date:
February 22, 2019
Export Citation:
Assignee:
HITACHI CHEMICAL CO LTD (JP)
International Classes:
B22F3/10; B22F5/00; C22C9/00; C22C38/00; F01L3/08
Foreign References:
| JPS5298607A | 1977-08-18 | |||
| JPH1081943A | 1998-03-31 | |||
| JPS53147608A | 1978-12-22 | |||
| JP2001158934A | 2001-06-12 | |||
| JP2012092441A | 2012-05-17 |
Attorney, Agent or Firm:
MIYOSHI Hidekazu et al. (JP)
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