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AssigneeThe Johns Hopkins University
InventorsTimothy P. Weihs, Michael Reiss, Omar Knio, Albert Joseph Swiston, Jr., David van Heerden, Todd Hufnagel
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Reactive foils and their uses are provided as localized heat sources useful, for example, in ignition, joining and propulsion. An improved reactive foil is preferably a freestanding multilayered foil structure made up of alternating layers selected from materials that will react with one another in an exothermic and self-propagating reaction. Upon reacting, this foil supplies highly localized heat energy that may be applied, for example, to joining layers, or directly to bulk materials that are to be joined. This foil heat-source allows rapid bonding to occur at room temperature in virtually any environment (e.g., air, vacuum, water, etc.). If a joining material is used, the foil reaction will supply enough heat to melt or soften the joining material, which upon cooling will form a strong bond, joining two or more bulk materials. If no joining material is used, the foil reaction supplies heat directly to at least two bulk materials, melting or softening a portion of each bulk, which upon cooling, form a strong bond. Additionally, the foil may be designed with openings that allow extrusion of the joining (or bulk) material through the foil to enhance bonding.
A layered structure for bonding together two bodies comprising a freestanding reactive multilayer foil and a layer of joining material, wherein a product of stress in the foil and the foil thickness is less than or equal to 1000 N/m.
A layered structure for bonding together two bodies comprising a reactive multilayer foil and a layer of joining material, wherein the reactive multilayer foil is scored or perforated to facilitate cracking after ignition.
A layered structure for bonding together two bodies comprising a reactive multilayer foil and a layer of joining material, wherein the reactive multilayer foil has a plurality of openings for the passage of the joining material after heating.
A layered structure for bonding together two bodies comprising a reactive multilayer foil and a layer of joining material, wherein the joining material comprises an amorphous material.
A layered structure for bonding together two bodies comprising a reactive multilayer foil and a layer of joining material, wherein the joining material comprises a metallic glass.
A layered structure for bonding together two bodies comprising a reactive multilayer foil and a layer of joining material, wherein the joining material comprises a crystalline metallic material that cools to a material comprising amorphous material after heating by ignition of the reactive foil.
A layered structure for bonding together two bodies comprising a reactive multilayer foil and a layer of joining material, wherein the joining material comprises a crystalline metallic material that cools to a fully or partially quasicrystalline state after heating by the reactive foil.
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method for bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
A method of bonding a first body to a second body comprising the steps of:
Dependencies are inferred from the claim text.