Title:
【発明の名称】Fe基焼結合金製バルブシート
Document Type and Number:
Japanese Patent JP2773747
Kind Code:
B2
Abstract:
An Fe-base sintered alloy for valve seats for use in internal combustion engines and a method of manufacturing the same are provided. The alloy consists essentially of 0.6 to 1.3% C, 1 to 5% Cr, 4 to 15% Mo, 0.5 to 2% Ni, 2 to 8% Co, 0.2 to 2% Nb, 0.2 to 2% at least one lubricating component selected from the group consisting of a CaF2 and BaF2 and the balance of Fe and inevitable impurities. Starting powders are blended into the same composition as above, and mixed into a mixed powder. The mixed powder is pressed into a green compact. Then, the green compact is presintered, hot forged, sintered, and, if required, further heat treated, in sequence to be formed into an Fe-base sintered alloy having a structure wherein particles of the at least one lubricating component and hard particles of other components are dispersed in a matrix formed principally of a pearlite phase. The resulting alloy possesses a density of at least 7.3 g/cm3 and Rockwell handness of 30-50 in Rockwell Scale C, and hence exhibits excellent abrasion resistance as well as excellent lubricity.
Inventors:
Osamu Mayama
Tomomi Ishikawa
Tomomi Ishikawa
Application Number:
JP5762687A
Publication Date:
July 09, 1998
Filing Date:
March 12, 1987
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
C22C33/02; C22C38/00; C22C38/12; F01L3/02; (IPC1-7): C22C38/12; C22C38/00
Domestic Patent References:
| JP5141607A | ||||
| JP5163310A | ||||
| JP5344410A | ||||
| JP5620143A | ||||
| JP54119321A | ||||
| JP5941451A |
Attorney, Agent or Firm:
Kazuo Tomita