WEAR RESISTANT PISTON RING COATING
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United States of America Patent
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Mar 13, 2014
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Mar 13, 2013
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A method of manufacturing a coated piston ring includes applying a layer of an aluminum-based material to an outside surface of a ring body formed of an iron-based material, such as steel. The layer of an aluminum-based material is applied by thermal spraying. The method further includes an environmentally friendly heat treatment process causing the aluminum-based material to combine with the iron-based material of the ring body and form a wear resistant coating of aluminum iron (Al5Fe2). The heat treatment process can include heating to a temperature of about 550° C. for 20 minutes so that the wear resistant coating achieves a hardness of HV 1000.
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