The Johns Hopkins University

Reactive Nanotechnologies, Inc.

Nanofoil Corporation

David Van Heerden

Timothy P Weihs

Omar Knio

Michael Reiss

Timothy Ryan Rude

Todd Hufnagel

Ramzi Vincent

Dale Deger

Ronald L Spraker

Jesse E Newson

Howard S Feldmesser

Ellen Heian

Etienne Besnoin

Somasundaram Valliappan

Yuping Lin

Albert Joseph Swiston, Jr

A method for bonding an LED assembly () or other electronic package () to a substrate PCB containing a heat-sink (), which utilizes layers of reactive multilayer foil () disposed between contacts () of the electronic packageand the associated contact pads () on the supporting substrate PCB. By initiating an exothermic reaction in the reactive multilayer foil (), together with an application of pressure, sufficient heat is generated between the contacts () and the associated contact pads () to melt adjacent bonding material () to obtain good electrically and thermally conductive bonds between the contactsand contact pads () without thermally damaging the electronic package (), heat-sensitive components () associated with the electronic package (), or other the supporting substrate PCB.

Method for low temperature bonding of electronic components

Applicants have discovered that electrostatic discharge (ESD) may, in some circumstances, result in current densities sufficient to ignite unprotected reactive composite materials. They have further discovered that a reactive composite material (RCM) can be protected from ESD ignition without adversely affecting the desirable properties of the RCM by the application of conducting and/or insulating materials at appropriate locations on the RCM. Thus ESD-protected RCM structures can be designed for such sensitive applications as ignition of propellants, generation of light bursts, and structural materials for equipment that may require controlled self-destruction.

Reactive composite material structures with electrostatic discharge protection and applications thereof

The invention includes a method of joining two components. The method includes providing at least two components to be joined, a reactive multilayer foil, and a compliant element, placing the reactive multilayer foil between the at least two components, applying pressure on the two components in contact with the reactive multilayer foil via a compliant element, and initiating a chemical transformation of the reactive multilayer foil so as to physically join the at least two components. The invention also includes two components joined using the aforementioned method.

Methods and device for controlling pressure in reactive multilayer joining and resulting product

Embodiments of the invention include a method for sealing a container. The method includes, providing at least two components of the container, positioning a crushable material between the at least two components, positioning a reactive multilayer material between the at least two components, deforming the crushable material so as to form a seal between the at least two components, chemically transforming the reactive multilayer material so as to join the at least two components.

Hermetically sealing a container with crushable material and reactive multilayer material

Container hermetically sealed with crushable material and reactive multilayer material

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.

Methods of making and using freestanding reactive multilayer foils

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 the joining materials, which upon cooling will form a strong bond, joining two or more bulk materials.

Reactive multilayer foil with conductive and nonconductive final products

Composite reactive multilayer foil

Freestanding reactive multilayer foils

Growing community of inventors

Baltimore, MD, United States of America

David Van Heerden