Development of warm compacted and high temperature sintered P/M sprockets for silent chain system of DIG (Direct Injection Gasoline) automotive engines

Akira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takaya Watanabe, Yoshimi Sugaya, Makoto Iwakiri, Takashi Sibano

Research output: Contribution to journalArticle

Abstract

The authors have previously reported on the warm compacted and normal temperature (1140°C) sintered P/M sprockets of the roller chain system of non-DIG (normal MPI gasoline) engines. In this new development, the mechanical properties of several warm-compacted and high-temperature sintered P/M steels were investigated. A wear test was also conducted to examine the anti-wear characteristics of these material using dummy engines. Finally, sprockets of silent chain system of DIG engines were developed that can endure sever wear conditions. The base powder used was a hybrid material (Distaloy DC1). It was 2mass%Ni (nickel) and was diffusion bonded to pre-alloy Fe-1.5mass%Mo (molybdenum) powder. The warm compaction was conducted with the powder, die and tools at 130°C. The sintering temperature was 1190°C and heat treatment was also applied to the sprockets.

Original languageEnglish
Pages (from-to)438-443
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume49
Issue number5
DOIs
Publication statusPublished - 2002 May

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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