Electric arc spray coating with cored wire
First Claim
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1. A method for applying a metallic coating to a substrate by electric arc spraying of cored wire comprising:
- (a) forming an electric arc between two metallic wires in an arc spray gun, wherein at least one of said wires is a cored wire comprising a powder-filled metallic sheath, thereby forming molten material; and
(b) directing inert gas across said arc to form molten droplets and propel said droplets onto said substrate to solidify and form said metallic coating, wherein the mass ratio of the wire feed rate to the inert gas feed rate is between about 0.055 and about 0.15;
whereby the operation of said arc spray gun at said mass ratio between about 0.055 and about 0.15 maximizes the microhardness of said metallic coating.
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Abstract
A method is disclosed for the electric arc spraying of powder-filled cored wires to apply hard, wear-resistant coatings to various substrates. Inert gas, preferably nitrogen, is supplied to the arc spray gun such that the mass ratio of the wire feed rate to the gas feed rate is preferably between about 0.07 and about 0.11. Operation in this range yields an optimum combination of coating hardness properties and arc spray gun operating characteristics.
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Citations
15 Claims
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1. A method for applying a metallic coating to a substrate by electric arc spraying of cored wire comprising:
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(a) forming an electric arc between two metallic wires in an arc spray gun, wherein at least one of said wires is a cored wire comprising a powder-filled metallic sheath, thereby forming molten material; and (b) directing inert gas across said arc to form molten droplets and propel said droplets onto said substrate to solidify and form said metallic coating, wherein the mass ratio of the wire feed rate to the inert gas feed rate is between about 0.055 and about 0.15; whereby the operation of said arc spray gun at said mass ratio between about 0.055 and about 0.15 maximizes the microhardness of said metallic coating. - View Dependent Claims (2, 3, 4, 5)
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6. A method for applying a metallic coating to a substrate by electric arc spraying of cored wire comprising:
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(a) forming an electric arc between two metallic wires in an arc spray gun, wherein at least one of said wires is a cored wire comprising a power-filled metallic sheath, thereby forming molten material; and (b) directing inert gas across said arc to form molten droplets and propel said droplets onto said substrate to solidify and form said metallic coating, wherein the mass ratio of the wire feed rate to the inert gas feed rate is between about 0.07 and about 0.11; whereby the operation of said arc spray gun at said mass ratio between about 0.07 and about 0.11 maximizes the microhardness of said metallic coating. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification