Currently,
synthesizing a “green” alternative for
primary explosives has become a new challenge for researchers, therefore
the feasibility of sulfate-based nanothermite n-Al/CuSO4·5H2O was investigated in this work. n-Al/CuSO4·5H2O was prepared by electrostatic spraying
(ES), which formed unified microspheres; CuSO4·5H2O particles were coated with n-Al particles. The reactivity
was initially evaluated using thermogravimetry (TG) and differential
scanning calorimetry (DSC), and the results show that the heat release
of n-Al/CuSO4·5H2O (ES) is 1.6 kJ/g more
than that of n-Al/CuSO4·5H2O (PM). A high-speed
camera and ignition experiments in a confined bomb were used to assess
the combustion performance of the two samples. Results show that n-Al/CuSO4·5H2O (ES) exhibited outstanding performance
for flame, peak pressure, and pressurization rate. The combustion
in the confined bomb experiment also demonstrates that a molar ratio
up to 8:1 can be the optimum ratio for the reaction between the fuel
and the oxidizer. To compare the performance of metallic oxide nanothermite,
n-Al/CuO was prepared by physical mixing. The n-Al/CuSO4·5H2O nanothermite shows more gas release and it
is safer than that of n-Al/CuO nanothermite, which was confirmed by
the results of combustion in the confined bomb and electrostatic sensitivity
experiments. Moreover, in this investigation n-Al/CuSO4·5H2O (ES) was used to directly initiate RDX which
is a feasible design for replacing lead-based primary explosives.
Abstract:Heat is considered to play an important role in Semiconductor Bridge (SCB) plasma ignition. Nevertheless, in this paper a non-heat effect is reported for SCB ignition of primary explosives. An initial comparison showed that there is no reasonable correlation between the ease of plasma ignition and the 5-s explosion temperature. Meanwhile the addition of Pb3O4 was found to make lead styphnate (LS) more active to SCB plasma ignition whereas the heat decomposition of this mixture was not accelerated. In terms of the phenomena mentioned above and the response of primary explosives to SCB plasma, we propose an effect of light in SCB plasma ignition. The free radical concentration change indicates that light enhances the activity of primary explosives in SCB plasma ignition. Regarding the mixture of LS and Pb3O4, the additive itself does not make LS sensitive to the SCB plasma. However, the supplement makes LS active under light exposure. As a result, the effect of light on SCB plasma ignition was confirmed by the experiments conducted in this study. This paper provides a new understanding of SCB plasma ignition from the viewpoint of explosives, which is of importance for the design of SCBs.
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