Email this article Specific features of combustion of nanothermites based on nanoaluminum at laser initiation
- Authors: Kirilenko V.G.1, Grishin L.I.2,3, Dolgoborodov A.Y.1,2,3, Brazhnikov M.A.1, Kuskov M.L.1, Valyano G.E.2
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Affiliations:
- N. N. Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences
- Joint Institute for High Temperatures of the Russian Academy of Sciences
- National Research Nuclear University MEPhI
- Issue: Vol 15, No 1 (2022)
- Pages: 82-97
- Section: Articles
- URL: https://journal-vniispk.ru/2305-9117/article/view/288296
- DOI: https://doi.org/10.30826/CE22150110
- ID: 288296
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Abstract
The work deals with thermites based on mixtures of nanosized Al with oxides of copper, bismuth, molybdenum, and nickel. New data have been obtained on the minimum initiation energy and burning rate depending on the density and the ratio of the components. The thermites were initiated by a laser diode pulse with a wavelength of 808 nm and a radiation power density of up to 700 W/cm2. The parameters of ignition and burning were recorded using a multichannel pyrometer and high-speed video camera. The brightness temperature of nanothermite combustion products has been measured. The effect that inert light-absorbing nanosized additives have on the threshold parameters of laser-induced initiation and on the burning rate of the mixtures has been studied. Based on the results obtained, the assumptions were made regarding the mechanism of initiation and the reaction process induced by laser pulse radiation.
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About the authors
Vladimir G. Kirilenko
N. N. Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences
Author for correspondence.
Email: vladkiril@gmail.com
Candidate of Science in physics and mathematics, senior research scientist
Russian Federation, 4 Kosygin Str., Moscow 119991Leonid I. Grishin
Joint Institute for High Temperatures of the Russian Academy of Sciences; National Research Nuclear University MEPhI
Email: lenya-grishin@mail.ru
junior research scientist, Ph.D. student
Russian Federation, 13-2 Izhorskaya Str., Moscow 125412; 31 Kashirskoe Sh., Moscow 115409Alexander Yu. Dolgoborodov
N. N. Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences; Joint Institute for High Temperatures of the Russian Academy of Sciences; National Research Nuclear University MEPhI
Email: aldol@ihed.ras.ru
Doctor of Science in physics and mathematics, chief research scientist, head of laboratory, teacher
Russian Federation, 4 Kosygin Str., Moscow 119991; 13-2 Izhorskaya Str., Moscow 125412; 31 Kashirskoe Sh., Moscow 115409Michael A. Brazhnikov
N. N. Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences
Email: birze@inbox.ru
Candidate of Science in pedagogy, senior research scientist
Russian Federation, 4 Kosygin Str., Moscow 119991Michael L. Kuskov
N. N. Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences
Email: mkuskov72@gmail.com
Candidate of Science in physics and mathematics, senior research scientist
Russian Federation, 4 Kosygin Str., Moscow 119991Georgii E. Valyano
Joint Institute for High Temperatures of the Russian Academy of Sciences
Email: gev06@bk.ru
senior research scientist
Russian Federation, 13-2 Izhorskaya Str., Moscow 125412References
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Supplementary files
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Figure 1 The SEM images of nAl (a), nBi2O3 (b), nMoO3 (c) and nanothermite (NT): Al/CuO 19/81 (d), Al/Bi2O3 15/85 (e), and Al/MoO3 30/70 (f)
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Figure 2 Surface structure of Al/CuO (Ψ = 1.1) samples of different porosity: (a) ε = 90%; and (b) ε = 78%
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Figure 3 Schematic of the experimental setup: 1 — control computer; 2 — power supply and control unit; 3 — laser diode; 4 — focusing lenses; 5 — camcorder Phantom Miro LC-310; 6 — protective glass plates; 7 — target with sample; 8 — optical fiber; 9 — pyrometer; and 10 — digital oscilloscope
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Figure 4 Oscillograms: 1 — laser pulse (timp = 1820 μs); and 2 — TTL pulse (timp = 1900 μs)
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Figure 5 Characteristic records of radiation at NT ignition: signals from the rear (1) and front (2) surfaces
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Figure 6 Critical energy density of NT Al/CuO (Ψ = 1.1) ignition on porosity: 1 — 207 W/cm2; and 2 — 650 W/cm2
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Figure 7 Burning velocity vs. porosity for NT Al/CuO (Ψ = 1.1): 1 — data of the present authors; 2 — data [12]; and 3 — data [18]
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Figure 8 Effect of carbon black content on time delay and critical energy of NT Al/CuO (Ψ = 1.1, ε = 89%) initiation
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Figure 9 Brightness temperature of combustion products: 1 — Al/CuO (Ψ = 1.1); 2 — Al/CuO (Ψ = 1.1) +1% carbon black; 3 — Al/MoO3 (Ψ = 1.2); and 4 — Al/Bi2O3 (Ψ = 1.6)
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Figure 10 Initial stage of NT laser ignition
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Figure 11 Reaction development after laser pulse completion: signals from the front (1) and rear (2) surfaces
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Figure 12 Frames of high-speed shooting of reaction propagation over the sample surface at laser initiation of NT at ε = 89%
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Figure 13 Frames of high-speed shooting of reaction propagation over the sample surface of NT at ε = 52%
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Figure 14 Burning velocity vs. tube length for NT Al/CuO (Ψ = 1.1, ε = 87%)
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Figure 15 Frames of high-speed shooting of reaction propagation of NT Al/CuO (Ψ = 1.1, ε = 87%) in a glass tube of 450 millimeter length
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Figure 16 Change in the burning velocity of NT Al/CuO (Ψ = 1.1, ε = 87%) along the axis of the tube of 450 millimeter length
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