Method of making reactive multilayer foil and resulting product
AssigneeThe Johns Hopkins University
InventorsTimothy P. Weihs, Michael Reiss
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Abstract
In accordance with the invention a reactive multilayer foil is fabricated by providing an assembly (stack or multilayer) of reactive layers, inserting the assembly into a jacket, deforming the jacketed assembly to reduce its cross sectional area, flattening the jacketed assembly into a sheet, and then removing the jacket. Advantageously, the assembly is wound into a cylinder before insertion into the jacket, and the jacketed assembly is cooled to a temperature below 100° C. during deforming. The resulting multilayer foil is advantageous as a freestanding reactive foil for use in bonding, ignition or propulsion.
Claims32
A method of fabricating a reactive multilayer foil comprising the steps of:
- providing an assembly of alternating layers of materials that can exothermically react;
- inserting the assembly into a jacket;
- deforming the jacketed assembly to reduce its cross sectional area;
- flattening the deformed jacketed assembly;
- and
- removing the jacket.
A reactive multilayer foil comprising a deformed and laminated stack of alternating layers of materials that can exothermic ally react, the stack deformed by pressure into a sheet with the layers laminated by cold welding;
- the reactive multilayer foil further comprising one or more layers of joining material adhered to the sheet.
A reactive multilayer foil comprising a deformed and laminated stack of alternating layers of materials that can exothermically react, the stack deformed by pressure into a sheet with the layers laminated by cold welding;
- the reactive multilayer foil further comprising layers of joining material adhered to the top and the bottom of the sheet.
A reactive multilayer foil comprising a deformed and laminated stack of alternating layers of materials that can exothermically react, the stack deformed by pressure into a sheet with the layers laminated by cold welding;
- the reactive multilayer foil further comprising a plurality of openings through the sheet, the openings having effective diameters in the range 10 to 10,000 micrometers.
A reactive multilayer foil comprising a deformed and laminated stack of alternating layers of materials that can exothermically react, the stack deformed by pressure into a sheet with the layers laminated by cold welding;
- wherein the alternating layers react by reduction-oxidation.
A reactive multilayer foil comprising a deformed and laminated stack of alternating layers of materials that can exothermically react, the stack deformed by pressure into a sheet with the layers laminated by cold welding;
- wherein the alternating layers react by reduction-formation.
A reactive multilayer foil comprising a deformed and laminated stack of alternating layers of materials that can exothermic ally react, the stack deformed by pressure into a sheet with the layers laminated by cold welding;
- wherein the alternating layers comprise layers of aluminum or aluminum alloy alternating with layers of copper oxide.
A reactive multilayer foil comprising a deformed and laminated stack of alternating layers of materials that can exothermically react, the stack deformed by pressure into a sheet with the layers laminated by cold welding;
- wherein the stack of alternating layers includes diluent material that absorbs energy, thereby lowering the reaction temperature.
A method of bonding a first body to a second body comprising the steps of:
- disposing between the first body and the second body, a free standing reactive multilayer foil comprising a deformed assembly of materials that can exothermically react, the materials laminated together by deformation;
- pressing the bodies against the reactive foil;
- and
- igniting the foil.
An article comprising a deformed and laminated stack of alternating layers of materials that can exothermically react, the stack deformed by pressure into a sheet with the layers laminated by cold welding.
Dependencies are inferred from the claim text.