Composite reactive multilayer foil

A thin, reactive technology, applied in the field of freestanding multi-layer thin sheets, which can solve the problems of detachment, failure to successfully combine, and material difficulties.

Inactive Publication Date: 2009-07-15
THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, many materials pose great difficulty and have not previously been successfully combined
In addition, methods that use r

Method used

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  • Composite reactive multilayer foil
  • Composite reactive multilayer foil
  • Composite reactive multilayer foil

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0067] The reactive flakes of aluminum and nickel were formed by cold rolling a number of 5 μm nickel and aluminum flakes stacked together. Figure 6 Stack 61 is shown passing through press rollers 62A and 62B to make sheet 60 . The sheet can be cold rolled several times until the thickness of the layers is reduced to the desired value.

example 2

[0069] Rather than using a sheet composed of multiple layers of the same thickness, a composite sheet is used, where responsive multilayers of nanolayers are deposited on reactive microlayer sheets. Such as Figure 7 As shown, some portions of the layer 70 in the reactive flake 71 will be nanoscale (nanolayers) and other portions 72 will be micron-thick layers (microlayers). As noted above, the nanolayer will readily react and once the reaction begins, will self-diffuse along the length of the sheet without being snapped by melting of surrounding brazing layers or loose components. Thus, nanolayers can be considered as igniters of microlayers. The portion 72 with the microlayers cannot sustain a self-diffusion reaction at room temperature, but when heated by the adjacent nanolayer portion 70, it will maintain the reaction. The flakes may consist of alternating layers of aluminum and nickel.

example 3

[0071] In making these composite sheets, sheets of aluminum and nickel are calendered to form microlayer sections, and then nanolayer sheets are vapor deposited on either surface of the microlayer structure. Fabrication can also be done by vapor deposition of the entire composite, where microlayers are deposited at a higher rate without igniting the flakes or causing unacceptable mixing in alternating layers during deposition.

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Abstract

Reactive flakes and their use are provided as localized heat sources for ignition, connection and propulsion. An improved reactive sheet (14) preferably has a multi-layer sheet structure consisting of alternating layers (16, 18) selected from materials that can react with each other in exothermic and self-diffusion reactions. Upon reaction, these sheets provide high localized heat that can be used, for example, to join layers, or to join loose materials directly. This sheet heat source can produce rapid connections at room temperature in various environments (eg, air, vacuum, water, etc.). If a joining material is used, the sheet reaction will provide enough heat to melt the joining material. If no connecting material is used, the sheet reaction provides heat directly to at least two loose materials, melting a portion of each, forming a strong bond upon cooling. In addition, the sheet (14) can also be designed with openings that allow joining (or loose) material to pass through the sheet to increase join strength.

Description

[0001] government concern [0002] This invention was made with Government support under Licenses DMR-9702546 and DMR-9632526, and through Military Laboratory / Advanced Materials Characterization Program Award No. 019620047. The government has certain rights in this invention. [0003] Cross references to related applications [0004] This application claims the benefit of US Provisional Application Serial No. 60 / 201,292, filed May 2, 2002, by the applicant and entitled "Reactable Multilayer Sheets." It is co-filed with U.S. Application Serial No. _____ by M.E. Reiss et al. and entitled "Methods of Making Reactive Multilayer Sheets and Producing Products," and U.S. Application Serial No. _____ by T.P. Weiths et al. Application Serial No. _____ and entitled "Reactive Multilayer Structures for Ease of Handling and Enhanced Ductility" are related. These three related applications are hereby incorporated by reference. technical field [0005] The present invention relates to...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K20/00B23K20/06B23K20/08B23K35/02B23K35/34B32B15/01C06B21/00C06B45/14F24J1/00H05K3/34B21C37/00B23K28/00B32B18/00B32B37/00C04B37/02C06B33/00C06C7/00C06C7/02C23C14/14F24V30/00
CPCC04B2237/68C04B2237/124Y10S228/902C04B2237/40B23K20/06B32B15/01C04B37/006B32B15/017B32B18/00C04B2237/368C04B37/026H05K3/3463C04B2237/72B23K35/34C04B2237/708B23K1/0006F24J1/00C04B2237/78C04B2237/402C04B2237/121H05K3/3494B32B2311/24C04B2237/123H05K2203/1163B23K20/08C06B45/14B23K35/0233B23K28/00Y10S428/94C23C14/14C06B21/0083C21D2211/008C04B2237/122C04B2237/341B23K20/00B23K20/165C04B2237/60B23K35/0238H05K2203/0405Y10S72/70C04B2235/6562C04B2235/6565F24V30/00Y10T29/49925Y10T428/25Y10T428/12632Y10T428/1275Y10T428/12438Y10T428/265Y10T428/12076Y10T428/2993Y10T29/49929Y10T428/12361Y10T428/12069Y10T428/12028Y10T428/1259Y10T428/12944Y10T428/12451Y10T428/12063Y10T428/12903Y10T428/1209Y10T428/12229Y10T428/12819Y10T428/12493B32B15/04
Inventor 蒂莫西·P·魏斯迈克尔·莱斯奥马尔·科尼奥戴维·范希尔登托德·赫弗纳格尔霍华德·菲尔德迈塞
Owner THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
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