Tougher valve seats use two hard particles but no cobalt

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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Japanese researchers have produced a new material for internal combustion engine valve seats inserts (VSI) of cobalt, and which is more environmentally friendly, and cheaper. Nissan Motor Co. and Hitachi Powdered Metals have developed and used a high-speed steel based sintered material for exhaust VSI which is both cobalt and lead free. A new exhaust VSI fulfill the needs such as sufficient wear resistance in conventional engines, cobalt and lead free, good machinability characteristics and reduced production costs. To obtain a sufficient adhesive resistance, it is necessary to select a matrix and hard particles with superior strength and hardness at high temperatures, good lubrication, and the capability to form an oxide film.

Original languageEnglish
Pages (from-to)20-22
Number of pages3
JournalMetal Powder Report
Volume60
Issue number4
DOIs
Publication statusPublished - 2005 Apr
Externally publishedYes

Fingerprint

Cobalt
Die casting inserts
Machinability
Steel
Internal combustion engines
Oxide films
Lubrication
Wear resistance
Adhesives
Metals
Hardness
Engines
Costs
Temperature

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Tougher valve seats use two hard particles but no cobalt. / Fujiki, Akira; Oyanagi, Mitsushi; Miyazawa, Tomonori; Fujitsuka, Hiroki; Kawata, Hideaki.

In: Metal Powder Report, Vol. 60, No. 4, 04.2005, p. 20-22.

Research output: Contribution to journalArticle

Fujiki, A, Oyanagi, M, Miyazawa, T, Fujitsuka, H & Kawata, H 2005, 'Tougher valve seats use two hard particles but no cobalt', Metal Powder Report, vol. 60, no. 4, pp. 20-22. https://doi.org/10.1016/S0026-0657(05)00393-0
Fujiki, Akira ; Oyanagi, Mitsushi ; Miyazawa, Tomonori ; Fujitsuka, Hiroki ; Kawata, Hideaki. / Tougher valve seats use two hard particles but no cobalt. In: Metal Powder Report. 2005 ; Vol. 60, No. 4. pp. 20-22.
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