Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Reexamination Certificate
2006-05-10
2008-12-02
McMahon, M. (Department: 3741)
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
Reexamination Certificate
active
07458358
ABSTRACT:
A piston (120) and method for making a piston (120) for a fuel-injected diesel engine adapted to withstand the damaging effects of fuel injection plume-induced oxidation in the regions of the piston bowl (134) and rim (130). The surfaces of the piston crown (126) targeted by the fuel injection plume (138) are first coated with a corrosion-resistant and oxidation-resistant composition applied as a slurry or by a thermal spraying technique, such as HVOF or plasma spraying. Thereafter, a high energy industrial laser beam irradiates the as-sprayed coating to increase its density, while simultaneously reforming its microstructure so as to fuse, alloy, and materially bond the coating material with the underlying steel substrate, thereby resulting in a durable protective surface for the steel piston crown (126).
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Azevedo Miguel
Lineton Warran
Dickinson Wright PLLC
Federal - Mogul World Wide, Inc.
McMahon M.
Stearns Robert L.
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