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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN En Línea: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2013005289
pages 511-528

FINE PATTERNING OF THERMITES FOR MECHANISTIC STUDIES AND MICROENERGETIC APPLICATIONS

Kyle T. Sullivan
Lawrence Livermore National Laboratory, Livermore, CA, 94551
J. D. Kuntz
Lawrence Livermore National Laboratory, Livermore, CA, 94551
Alex E. Gash
Lawrence Livermore National Laboratory, Livermore, CA, 94551

SINOPSIS

Electrophoretic deposition (EPD) was combined with lithographic patterning techniques to deposit well-mixed thermites onto fine-featured (10−1000 µm) conductive substrates. It was found that thin thermite films using nano- and micronsized Al, with nanosized CuO as the oxidizer, were able to turn corners up to 150 deg with ease. Both nano- and micron-Al thermites exhibited jumping behavior, which ranged from 0 to almost 10 mm, and which increased with film thickness. This behavior is attributed to pressure buildup and unloading, which serves to rapidly advect micronscale particles at high velocity, and ahead of the reaction zone. For the quench studies, we found that very thin films (<10 µm) were needed before any quenching occurred, and even then, some systems did not quench down to 46 × 13 µm dimensions. The results of the mechanistic studies were used to examine a potential application as multichannel igniter. Delays from 6 to 18 ms were made by changing the stoichiometry, and by using both nano- and micron-Al thermites. The deposit thickness was kept above the quench value, and below the thickness corresponding to material jumping. Also, several 90 deg turns were included to reduce the overall size of the device, and to highlight the ability to include nonlinear pathways. For the deposition conditions used, it was found that the arrival time for a six-channel igniter has <5% uncertainty in timing, and <4% reproducibility between identical samples. This precision at such fine length scales is directly attributed to EPD, a low-cost and repeatable technique that allows for the deposition of energetic materials onto arbitrary fine-featured conductive substrates.


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