Process and Materials Development for Adherently Sprayed Valve Seats on Aluminum Engine Heads

Paper #:
  • 980329

Published:
  • 1998-02-23
Citation:
Popoola, O., Reatherford, L., and McCune, R., "Process and Materials Development for Adherently Sprayed Valve Seats on Aluminum Engine Heads," SAE Technical Paper 980329, 1998, https://doi.org/10.4271/980329.
Pages:
10
Abstract:
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.
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