Metal treatment
AssigneeAlloy Surfaces Company, Inc.
InventorAlfonso L. Baldi
Life of this patent
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Abstract
Diffusion coating can be speeded by high heat input. Diffusion coating packs can be made with chemically reduced metal content of sludges. Diffusion aluminizing followed by caustic leaching to remove much of the diffused-in aluminum, yields catalytically and pyrophorically active porous surface that also accepts top coatings. Mixtures of aluminum powder with nickel and/or iron powders react when heated to form Raney-like product that can be leached to become pyrophoric, and when held on a metal foil or gauze web will adhere to the web so that leached product can be used as pyrophoric foil for decoying heat-seeking missiles. Such adhesion is improved by addition of small amount of copper.
Claims11
The process for production of nickel and iron aluminides which comprises pouring onto an iron foil a mixture of powdered aluminum and powdered nickel and/or iron, which mixture also contains about 1/30 to about 1/3 atom copper for every atom of nickel and iron, and in a suitable atmosphere heating the mixture to cause the powdered metals to interact.
The process of preparing a pyrophorically modified foil, in which process a metal foil about 0.02 to about 0.05 millimeters thick has applied to its surface a layer of a mixture of powdered aluminum with iron, nickel or both iron and nickel which is then heated to cause the powders to inter-react without materially degrading the foil, to form aluminides of iron or nickel or iron-nickel having at least twice as many aluminum atoms as nickel and iron atoms, sintered to the foil, thereafter the resulting foil is leached to remove some of the aluminum from the aluminides and thus to develop pyrophoricity.
Dependencies are inferred from the claim text.