Surface preparation of nickel base alloys for brazing
AssigneeAvco Corporation
InventorsJule A. Miller, Jack W. Lee, Jeffrey Thyssen
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Abstract
A method is disclosed for the removal of undesirable oxides from the surface of nickel-base or nickel-iron base alloys containing oxidizable aluminum and/or titanium prior to brazing. The alloy is heated in air at an elevated temperature for a time sufficient to form on the alloy surface a bilayered film comprised of a first oxide top layer containing at least titanium or aluminum and a second layer beneath the first comprised of the alloy composition substantially depleted of aluminum and/or titanium. The surface of the alloy is cleaned to remove the first oxide layer whereupon the remaining surface is in condition for brazing.
Claims5
A method for preparing for brazing the surface of nickel-base or nickel-iron base alloys containing at least one oxidizable metal selected from the group consisting of aluminum and titanium, the method comprising heating the alloy, prior to brazing, in air at an elevated temperature for a time sufficient to form on the alloy surface a bilayered film comprised of a first oxide top layer containing at least titanium or aluminum and a second layer beneath the first comprised of the alloy composition substantially depleted of the oxidizable metal and then cleaning the surface of the alloy to remove the first oxide layer.
Dependencies are inferred from the claim text.