초록 ▼

Titanium and titanium alloy surfaces can be diffusion coated, and portions of the surface protected against such coating by localized powdered masking layer of about 43% titanium, aluminum in an amount equal to the aluminum content of the surface masked, as well as other metals in an amount about on

Titanium and titanium alloy surfaces can be diffusion coated, and portions of the surface protected against such coating by localized powdered masking layer of about 43% titanium, aluminum in an amount equal to the aluminum content of the surface masked, as well as other metals in an amount about one-fifth of their content in the surface masked. Diffusion coating can be speeded by high heat input. Diffusion coating packs can be made with chemically reduced metal content of sludges. Diffusion aliminizing 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.

대표청구항 ▼

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, iron and nickel which is then heated to cause the powders to inter-react without materially degradin

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, iron and nickel which is then heated to cause the powders to inter-react without materially degrading the foil, to form iron and nickel aluminides having at least twice as many aluminum atoms as nickel and iron atoms and sintered to the foil, and the resulting foil is leached to remove some of the aluminum from the aluminides and thus to develop pyrophoricity.