Metal treatment – Process of modifying or maintaining internal physical... – Surface melting
Reexamination Certificate
1999-05-24
2001-10-09
Wyszomierski, George (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Surface melting
C148S525000, C219S121820, C219S121850, C427S556000, C427S597000
Reexamination Certificate
active
06299707
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is directed toward a method for enhancing the wear resistance of an aluminum cylinder bore comprising laser alloying of the cylinder bore with selected precursors. The present invention is particularly well suited for enhancing the wear resistance in an aluminum block engine comprising aluminum cylinder bores.
2. Description of the Prior Art
Internal combustion engines comprise cylinder bores which receive reciprocating pistons. These cylinder bores are exposed to harsh environmental conditions, including friction and high temperatures. The harsh environmental conditions result in wear and/or corrosion, thereby reducing the effective life of the aluminum block engine.
SUMMARY OF THE INVENTION
The present invention is directed toward a process or method for producing alloyed aluminum cylinder bores for use in an internal combustion engine. The present invention comprises applying a precursor layer comprising a binder and metallic or ceramic powder to the surface of an aluminum cylinder bore, as shown in Block
10
of FIG.
1
. The precursor layer has a thickness in the range of 50-150 microns.
The invention further comprises irradiating the cylinder bore with a laser beam at a sufficient energy level and for a sufficient time to produce an alloyed layer on the surface of the cylinder bore having enhanced wear characteristics, as shown in Block
12
of FIG.
1
. During irradiation, the cylinder bore and the laser beam are moved relative to each other.
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Bible John Brice
Dahotre Narendra B.
Hopkins John A.
McCay Mary Helen
McCay T. Dwayne
Duane Morris & Heckscher LLP
The University of Tennessee Research Corporation
Wyszomierski George
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