Results 131 to 140 of about 581 (155)

Combustion Features of Nanothermites in Pyrotechnic Heaters

Russian Journal of Physical Chemistry B, 2019
Several thermite systems (Al/Fe2O3 and Mg/Fe2O3) with promising applications in sealed pyrotechnic heat sources under space conditions have been reported earlier. Experiments have found excellent propagation of the combustion reaction of these thermites inside sealed steel tubes. Outer tube surfaces have been heated up to 700–1000°C.
K. A. Monogarov, D. B. Meerov, Yu. V. Frolov, A. N. Pivkina   +3 more
openaire   +1 more source

Aluminum Hydride as a Fuel Supplement to Nanothermites

Journal of Propulsion and Power, 2014
PressurizationratesincreasebyafactorofabouttwowiththeadditionofAlH3,whereasburntubevelocitiesincrease by about 25%. The enhancement in pressurization rate appears to primarily be a result of the increased pressure associated with the AlH3 decomposition in the nanocomposite thermite system and an enhancement in convective heat transfer.
G. Young, K. Sullivan, N. Piekiel, M. R. Zachariah   +3 more
openaire   +1 more source

Preparation and characterization of n-Al/FeF3 nanothermite

Chemical Engineering Journal, 2018
Abstract A new type of nanothermite composed of n-Al (metal fuel) and FeF3 (oxidizer) was investigated in this paper. The thermal behavior and combustion properties of the n-Al/FeF3 nanothermite were compared with that of n-Al/Fe2O3 nanothermite by TG/DSC-MS, XRD, SEM and high-speed camera.
Pan Liu, Xiangyu Li, Long Cheng, Xuqiang Zhu, Yanchun Li, Dongming Song   +5 more
openaire   +1 more source

Direct Writing of a 90 wt% Particle Loading Nanothermite

Advanced Materials, 2019
AbstractThe additive manufacturing of energetic materials has received worldwide attention. Here, an ink formulation is developed with only 10 wt% of polymers, which can bind a 90 wt% nanothermite using a simple direct‐writing approach. The key additive in the ink is a hybrid polymer of poly(vinylidene fluoride) (PVDF) and hydroxy propyl methyl ...
Haiyang Wang, Jinpeng Shen, Dylan J. Kline, Noah Eckman, Niti R. Agrawal, Tao Wu, Peng Wang, Michael R. Zachariah   +7 more
openaire   +2 more sources

Semi-Empirical Model for Reaction Progress in Nanothermite

Journal of Propulsion and Power, 2010
Calculations of thermite reaction progress were made using the Cheetah thermochemistry package. Progress was modeled by fractionally substituting reactants with an inert species with identical thermodynamic properties. The results of this model have been used to create a semi-empirical model of regression rate.
Adam Trebs, Timothy J. Foley
openaire   +1 more source

Thermo-Kinetic Study of Core-Shell Nanothermites

AIP Conference Proceedings, 2006
This article presents the formulation of a new nano‐thermite mixture (Al/KMnO4) for application in energetic materials. Reactivities of different thermite mixtures have been compared by a constant volume combustion experiment and the results indicate that the reactivity of the new formulation is two orders of magnitude greater than the traditional ...
openaire   +1 more source

Processing and characterization of aluminum-based nanothermites

Journal of Thermal Analysis and Calorimetry, 2009
During the past several years, a significant effort has been on investigation of reaction front propagation and the rate of energy release in heterogeneous systems consisting of nanopowder reactants. Substantial size reduction of each reactant powder (e.g.
openaire   +1 more source

Combustion of 3D printed 90 wt% loading reinforced nanothermite

Combustion and Flame, 2020
Abstract The use of Al-based nano-energetic materials has been limited in part due to difficulties in fabrication of high-density composites. In this paper, free-standing energetic composites with loading of up to 90 wt% Al-CuO were fabricated by 3D printing. A polymer hybrid of 3 wt% hydroxy propyl methyl cellulose (HPMC), 3.5 wt% nitrocellulose (NC)
Jinpeng Shen, Haiyang Wang, Dylan J. Kline, Yong Yang, Xizheng Wang, Miles Rehwoldt, Tao Wu, Scott Holdren, Michael R. Zachariah   +8 more
openaire   +1 more source

Sulfates‐Based Nanothermites: An Expanding Horizon for Metastable Interstitial Composites

Angewandte Chemie International Edition, 2015
AbstractMetal sulfates (Ba, Bi, Ca, Cu, Mg, Mn, Na, Zn, Zr) were used as oxidizers in reactive compositions with Al nanopowder. These new kinds of nanothermites have outstandingly high reaction heats (4–6 kJ g−1) compared to conventional Al/metal oxides (1.5–4.8 kJ g−1) and also have good combustion velocities (200–840 m s−1 vs 100–2500 m s−1).
Marc, Comet, Geoffrey, Vidick, Fabien, Schnell, Yves, Suma, Bernard, Baps, Denis, Spitzer   +5 more
openaire   +2 more sources

Preparation and characterization of Al/B/Fe2O3 nanothermites

Science China Chemistry, 2014
A sol-gel synthetic approach combined with an ultrasonic method was utilized to prepare Al/B/Fe2O3 nanothermites. The structure and properties of the prepared nanothermites were characterized by thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy, X-ray diffraction, and an impact sensitivity test.
LianHua Shen, GuoPing Li, YunJun Luo, Kun Gao, Zhen Ge   +4 more
openaire   +1 more source