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Electric arc spray coating with cored wire

  • US 5,294,462 A
  • Filed: 11/12/1992
  • Issued: 03/15/1994
  • Est. Priority Date: 11/08/1990
  • Status: Expired due to Fees
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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