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Title: Ignitable heterogeneous stratified structure for the propagation of an internal exothermic chemical reaction along an expanding wavefront and method of making same

A multilayer structure has a selectable, (i) propagating reaction front velocity V, (ii) reaction initiation temperature attained by application of external energy and (iii) amount of energy delivered by a reaction of alternating unreacted layers of the multilayer structure. Because V is selectable and controllable, a variety of different applications for the multilayer structures are possible, including but not limited to their use as ignitors, in joining applications, in fabrication of new materials, as smart materials and in medical applications and devices. The multilayer structure has a period D, and an energy release rate constant K. Two or more alternating unreacted layers are made of different materials and separated by reacted zones. The period D is equal to a sum of the widths of each single alternating reaction layer of a particular material, and also includes a sum of reacted zone widths, t.sub.i, in the period D. The multilayer structure has a selectable propagating reaction front velocity V, where V=K(1/D.sup.n).times.[1-(t.sub.i /D)] and n is about 0.8 to 1.2.
Inventors:
 [1];  [2]
  1. (Palo Alto, CA)
  2. (Menlo Park, CA)
Issue Date:
OSTI Identifier:
870523
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5538795
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
ignitable; heterogeneous; stratified; structure; propagation; internal; exothermic; chemical; reaction; expanding; wavefront; method; multilayer; selectable; propagating; front; velocity; ii; initiation; temperature; attained; application; external; energy; iii; amount; delivered; alternating; unreacted; layers; controllable; variety; applications; structures; including; limited; ignitors; joining; fabrication; materials; smart; medical; devices; period; release; rate; constant; separated; reacted; zones; equal; widths; single; layer; particular; material; zone; times; 1-; release rate; reaction layer; multilayer structures; medical applications; chemical reaction; multilayer structure; propagating reaction; reaction front; particular material; front velocity; rate constant; reaction initiation; energy release; external energy; temperature attained; ignitable heterogeneous; heterogeneous stratified; initiation temperature; /428/228/