Thermally sprayed aluminum-bronze coatings on aluminum engine bores
AssigneeGeneral Motors Corporation
InventorsMartin S. Kramer, Chester J. Rivard, Frank A. Koltuniak
Life of this patent
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Abstract
This specification describes the thermal spraying of an aluminum-bronze alloy coating onto aluminum alloy cylinder bores or piston skirts to provide a scuff- and wear-resistant surface.
Claims5
A method of making a cast hypoeutectic aluminum-silicon alloy engine block with a wear-resistant coating on the surface of the cylinder wall portions thereof comprising casting an aluminum engine block of such an aluminum composition with the cylinder wall portions slightly oversized, applying a coating of an aluminum-bronze alloy to the cylinder wall portions of such castings by melting the aluminum-bronze composition in a high velocity stream of an oxygen hydrocarbon fuel gas and propelling the molten aluminum-bronze alloy onto the surface of the cylinder walls in a uniform layer, the thickness of which is greater than the desired final coating, and
- machining the aluminum-bronze coating to a desired finished dimension.
An aluminum automotive engine block cast of a hypoeutectic aluminum-silicon alloy and containing a dense, thermally sprayed coating of aluminum-bronze alloy applied to the cylinder wall portions of the cast block.
An aluminum automotive engine block cast of a hypoeutectic aluminum-silicon 319 alloy and containing a thermally sprayed coating of aluminum-bronze alloy applied to the cylinder wall portions of the cast block.
A method of applying a wear-resistant coating of aluminum-bronze alloy to an aluminum alloy automotive piston comprising melting the aluminum-bronze alloy in a high velocity stream of an oxygen-hydrocarbon fuel gas and propelling the molten alloy onto a surface of the piston in a dense, uniform layer, the thickness of which is greater than the desired final coating, and
- machining the coating to a desired finished dimension.
An aluminum alloy automotive piston having a dense, thermally sprayed coating of aluminum-bronze alloy applied to cylinder wall engaging surfaces of the piston.
Dependencies are inferred from the claim text.