Thermally-sprayed, composite coatings have been developed and sprayed on aluminum engine heads to replace powdered metal valve seat inserts. The process uses a conventional two-wire arc (TWA) gun with nickel and iron-based wire feedstocks. A unique surface preparation technique was developed to assure excellent coating adhesion. A composite Fe/Fe3O4/Ni/NiO/CrO coating was dynamometer tested using a single-cylinder Rotax engine, and showed improved wear performance over a conventional powdered-metal insert. Details of surface preparation, coating development, tribological properties and engine testing are described in this work.
Process and Materials Development for Adherently Sprayed Valve Seats on Aluminum Engine Heads
Sae Technical Papers
International Congress & Exposition ; 1998
23.02.1998
Aufsatz (Konferenz)
Englisch
Process and Materials Development for Adherently Sprayed Valve Seats on Aluminum Engine Heads
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