Studying thermal decomposition properties of the perchlorate-based molecular perovskite energetic materials is essential to facilitate the potential applications. In this work, thermal decomposition properties of potassium perchlorate (KClO4)-based molecular perovskite were investigated. Potassium perchlorate -based molecular perovskite (H 2 dabco)[K(ClO 4 ) 3 ] were prepared by the one-pot reaction of KClO 4 , HClO 4 and triethylenediamine (dabco). The samples were characterized. The results show that (H 2 dabco)[K(ClO 4 ) 3 ] has ternary organic-inorganic perovskite crystal structures. The thermal decomposition results demonstrated that molecular perovskite (H 2 dabco)[K(ClO 4 ) 3 ] has a lower decomposition temperature (383.6 °C) and a higher heat release (2815 J g −1 ) than 607.7 °C and 313 J g −1 of the monocomponent KClO 4 , respectively. The activation energy of thermal decomposition of (H 2 dabco)[K(ClO 4 ) 3 ] had been reduced appreciably from 191.2 kJ mol −1 to 177.7 kJ mol −1 . A synergistic catalysis thermal decomposition mechanism based on unique molecular perovskite structure was proposed. This work offers a novel understanding for thermal decomposition of the molecular perovskite energetic materials.
Yang Fan,Kang Xiaoli,Luo Jiangshan,Yi Zao,Tang Yongjian
In this paper, a solvent/non-solvent synthetic approach has been utilized in preparing a new nanoenergetic material KClO 4 @Al/CuO by coating Al/CuO nanocomposites particles with a layer of nanoscale oxidizer KClO 4 . The coating process and mechanism are discussed. The composites of Al/CuO are uniformly mixed by mechanical ball milling process and CuO acts as a catalytic metallic oxide. The ternary mixtures KClO 4 @Al/CuO were characterized by X-ray diffraction (XRD) and the results reveal that after ball-milling and chemical synthesis process, the phase compositions haven’t changed. Scan electron microscopy (SEM) images show that these energetic nanocomposites consist of small clusters of Al/CuO that are in intimate contact with a continuous and clear-cut KClO 4 layer (100–400 nm). In a Scanning transmission electron microscopy (STEM) elemental map, high K/Cl intensity on the perimeter of the nanoparticles and high Cu/Al content in the interior powerfully demonstrated the KClO 4 @Al/CuO core-shell nanostructure. Electrical ignition experiments and pressure cell test prove that these nanoenergetic composites are more sensitive to ignition with much higher burning rate than traditional formulations (conventional counterparts). To quantify the enhancement of thermal behavior, Thermogravimetry (TG) and Differential scanning calorimetry (DSC) were performed and the results show that the burning rate of these energetic nanocomposites nearly tripled.
Fan Yang,Xiaoli Kang,Jiangshan Luo,Laixi Sun,Handing Xia,Zao Yi,Yongjian Tang
We report the first laser emission from flash ignition of Zr/Al nanoparticles with the addition of strong oxidizer KClO4 using Nd: YAG as a laser medium. The mixture Zr/Al/Kp-45 (mass ratio = 33%Zr: 33%Al: 34%KClO4) has the highest brightness temperature Tb = 4615 K and the adiabatic flame temperature Tf = 4194 K with the duration of 20 ms. At 1064 nm we measured a maximum output energy of 702.5 mJ with the duration of nearly 10 ms by using only 100 mg mixture with an output coupler (transmission T = 10%). Further optimizing the concentration cavity and increasing the mixture content will yield much higher efficiency and output energy.
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