Abstract
Metal particle size and environment will affect the reaction properties of aluminized polytetrafluoroethylene (Al/PTFE) reactive material. This study experimentally investigated the reaction properties of Al/PTFE with different Al particle sizes through time-resolved self-emitting imaging and emission spectroscopy under nanosecond laser ablation in air and an inert argon environment. The results show that the laser ablation causes a continuous combustion characteristic and a long energy release time in Al/PTFE. Furthermore, the reaction properties of Al/PTFE are closely related to the particle size of Al powder. The emission intensities and durations increase as Al particle size decreases, but it no longer conforms to this rule when Al particle size decreases to nanometers. This inconsistency may be due to the oxidation of Al powder and agglomeration of nano-Al powder. The experiments in different gas environments proved that the reactivity of Al/PTFE in the inert gas environment is not as good as that in air because of the lack of the oxidation reaction between Al and oxygen from the air.
Highlights
Reactive materials are a class of energetic materials formed by molding and sintering the mixture of two or more non-explosive energetic powders such as polymers, metals, alloys, and metallic oxides
This study experimentally investigated the reaction properties of aluminized polytetrafluoroethylene (Al/PTFE) with different Al particle sizes through time-resolved self-emitting imaging and emission spectroscopy under nanosecond laser ablation in air and an inert argon environment
The results show that the laser ablation causes a continuous combustion characteristic and a long energy release time in Al/PTFE
Summary
Reactive materials are a class of energetic materials formed by molding and sintering the mixture of two or more non-explosive energetic powders such as polymers, metals, alloys, and metallic oxides. Different from traditional energetic materials, they have a certain mechanical strength, and they are sufficiently insensitive so as not to be initiated by traditional initiation techniques They can release energy rapidly under highly dynamic loads. The intermediate chemical reactions of the energetic materials can be studied on a small scale (microgram quantities) under laser ablation, avoiding the destruction of large-scale explosion testing, so that time-resolved dynamic measuring technology can be used simultaneously.. This study sets out to investigate the reaction properties of Al/PTFE with different Al particle sizes under nanosecond laser ablation in different environments (argon/air). This is achieved by comparing and analyzing time-resolved selfemitting imaging and emission spectroscopy data collected in the experiment
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