Correlation of optical emission and pressure generated upon ignition of fully-dense nanocomposite thermite powders

Design and fabrication of energetic superlattice like-PTFE/Al with superior performance and application in functional micro-initiator

“…Moreover, Al and PTFE have an ultrahigh energy density of 21 kJ/cm 3 [27,29]. Second, the reaction of PTFE and Al exhibits a potential gas release because of the low boiling point of reaction product (AlF 3 ) and carbon which would react with oxygen to form oxycarbide in the atmospheric conditions, which is beneficial for the release of energy, combustion rate and many applications [30,31]. Figure 1(d) and (e) shows that energetic superlattice like-PTFE/Al material is composed of oxidant (PTFE), inert layer (Al-F compound) and fuel (Al) assembling in a metastable system.…”

“…Finally, the melting point of Al-F compound (1040 1C) in obtained like-PTFE/Al is significantly low. Particularly, the yielding significant amount of gaseous products such as AlF 2 and AlF 3 have an accelerating effect on the reaction of superlattice like-PTFE/Al [30,31]. Therefore, the special structure and improved interfacial diffusion offer super performance for energetic superlattice like-PTFE/Al to store and convert energy.…”

Sub-fragmentation of structural reactive material casings under explosion

“…Ignition temperature is another key parameter for hot spot material reaction. For arrested-reactive-milled nanocomposites 2Al⋅3CuO, 4Al⋅Fe 2 O 3 , 8Al⋅MoO 3 and 2.35Al⋅Bi 2 O 3 in vacuum, ignition temperatures were found to be similar in a range of 800-950 K [4]. Under charge detonation conditions, the bulk shocked temperature in the casing may not reach the thermite ignition temperature.…”

Correlating ignition mechanisms of aluminum-based reactive materials with thermoanalytical measurements

“…The thermal decomposition of metal oxide (e.g., CuO, MoO 3 , or others) is observed to occur and produce gas phase oxygen [127]. The gas release was quantified at high heating rates, typical for ignition [148]. The thermal contact between the powder particles and the filament is disrupted when oxygen is released by the decomposing oxide.…”