含能含氟小分子包覆铝粉的制备及其热分解机理

To investigate the effect of the novel energetic fluorinated small molecule 2-nitro-l, 3-diazet)dinone (2-NCF) on the energy release of aluminum powder, 2-NCF-coated micron aluminum was prepared via physical vapor deposition. The structural, characteristics and thermal decomposition mechanism of the composite were examined using theoretical calculations and multi-ple experimental techniques. The results show that 2-NCF binds to the aluminum surface through coordination between the car-bony I oxygen and surface A 丨3 + ions, with an optimal coating mass ratio of 1: 1. TC-DSC analysis indicates that the coating increases the exothermic enthalpy of aluminum from 6 560J/g to 15 428J/g, a 135% enhancement. Ignition tests reveal that the coating shortens the ignition delay from 3.06ms to 1.23ms and extends the combustion duration from 61.83ms to 126.3ms. Furthermore, active gaseous species (e.g., NO₂HF) released from 2-NCF decomposition react with aluminum to form vola-tile AlFs, promoting sustained oxidation and energy release. Kinetic analysis demonstrates that the thermal decomposition follows the random chain scission model (L2), with a combined kinetic apparent activation energy of 557. 12kJ/mol. This elevated E_aconfirms that 2-NCF optimizes the reaction pathway by reducing the phase transformation energy barrier.