The development of a cobalt-free exhaust valve seat insert

Hiroki Fujitsuka, Hideaki Kawata, Mitsushi Oyanagi, Tomonori Miyazawa, Akira Fujiki

研究成果: Conference contribution

1 被引用数 (Scopus)


Generally, cobalt-contained sintered materials have mainly been applied for exhaust valve seat inserts (VSI). However, there is a trend to restrict the use of cobalt as well as lead environmental law, and cobalt is expensive. To solve these problems, a new exhaust VSI on the assumption of being cobalt and lead free, applicable for conventional engines, having good machinability, and with a reduced cost was developed. The new exhaust VSI is a material dispersed with two types of hard particles, Fe-Cr-C and Fe-Mo-Si, in the matrix of an Fe-3.5mass%Mo at the ratio of 15 mass % and 10 mass % respectively.

ホスト出版物のタイトル2004 SAE World Congress
出版社SAE International
ISBN(印刷版)0768013194, 9780768013191
出版ステータスPublished - 2004 1 1
イベント2004 SAE World Congress - Detroit, MI, United States
継続期間: 2004 3 82004 3 11


Conference2004 SAE World Congress
CountryUnited States
CityDetroit, MI

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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