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.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Tougher valve seats use two hard particles but no cobalt


    Contributors:

    Published in:

    Metal Powder Report ; 60 , 4 ; 20-22


    Publication date :

    2005


    Size :

    3 Seiten, 2 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Hardened valve seats

    Engineering Index Backfile | 1937


    FLEXIBLE EXHAUST VALVE SEATS

    Beall, A. L. / Heron, S. D. | SAE Technical Papers | 1937


    VALVE MODULES FOR INFLATABLE SEATS

    LEM JEROEN / BOLAND BRIAN | European Patent Office | 2019

    Free access

    Sintered materials with new concept for valve seats - with and without cobalt

    Nakata,T. / Hayasaka,T. / Endoh,H. et al. | Automotive engineering | 1981


    Sintered Materials with New Concept for Valve Seats—With and without Cobalt

    Endoh, Hiroyuki / Miyamoto, Osamu / Hayasaka, Tadao et al. | SAE Technical Papers | 1981