Results 141 to 150 of about 1,071 (193)

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

Enhancing the Energy Release Performance of Al/CuO Nanothermites through Hierarchical Structure

Combustion Science and Technology
The objective of this study is to enhance the mixing uniformity and contact efficiency between nano-Al and oxidizers through structural control, while suppressing the “pre – ignition fusion” effect of nanothermites.
Qi-Hui Wang, Xiaofeng Sun, Ruozhou Wang, Li Liu, Qi Zhang, Yi Sun, Zhitao Yan, Xueming Li   +7 more
semanticscholar   +1 more source

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.
Yunjun Luo, Guoping Li
exaly   +2 more sources

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

Melt dispersion mechanism for fast reaction of nanothermites

Applied Physics Letters, 2006
An unexpected mechanism for fast oxidation of Al nanoparticles covered by a thin oxide shell (OS) is proposed. The volume change due to melting of Al induces pressures of 0.1–4GPa and causes spallation of the OS. A subsequent unloading wave creates high tensile pressures resulting in dispersion of liquid Al clusters, oxidation of which is not limited ...
Valery I. Levitas, Blaine W. Asay, Steven F. Son, Michelle Pantoya   +3 more
openaire   +1 more source

A comparative study of thermal kinetics and combustion performance of Al/CuO, Al/Fe2O3 and Al/MnO2 nanothermites

Vacuum, 2020
The performance of energetic materials is mainly reflected in two aspects, thermal performance and combustion performance. To figure out the differences in reaction performance, in this paper, thermal and combustion properties of Al/CuO, Al/Fe2O3 and Al ...
Jia-Xing Song, Tao Guo, M. Yao, Jialin Chen, Wen Ding, Feng-Li Bei, Yi-Ming Mao, Zhongshen Yu, Junyi Huang, Xiao-nan Zhang, Qin Yin, Shuo Wang   +11 more
semanticscholar   +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

Layered Double Hydroxide-Mediated Heterogeneous Growth of Metal-Organic Frameworks on Nanoaluminum for Highly Efficient Nanothermites.

ACS Applied Materials and Interfaces
Nanothermites offer the dual advantages of high energy density and exceptional reactivity, making them highly promising for advanced energetic applications such as aerospace and microelectromechanical systems (MEMS).
Momang Tian, Kunyu Xiong, Xin-Wen Ma, Ke-Juan Meng, Ruixuan Xu, Iftikhar Hussain, Kai-Li Zhang   +6 more
semanticscholar   +1 more source