Topic
Ammonium perchlorate
About: Ammonium perchlorate is a research topic. Over the lifetime, 2359 publications have been published within this topic receiving 33412 citations. The topic is also known as: AP.
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TL;DR: In this paper, the catalytic activity of as-synthesized material was examined for thermal decomposition of ammonium perchlorate (AP) using differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA).
Abstract: Nickel cobalt bimetallic nanoparticles (NiCo NPs) with different molar ratios were stabilized over three-dimensional nitrogen-doped graphene [3D-(N)G] by a chemical coreduction method. Various spectroscopic and microscopic analysis techniques were employed to characterize the resulting NiCo@3D-(N)G samples. The catalytic activity of as-synthesized material was examined for thermal decomposition of ammonium perchlorate (AP) using differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA). In presence of NiCo@3D-(N)G nanocomposite, the decomposition temperature was decreased by 140.9 °C and the high-temperature decomposition peak of AP disappeared. Also, the total heat release during decomposition of AP was significantly increased to about 1176.6 J g−1. The presented catalyst exhibits an impressive catalytic effect for thermal decomposition of AP, due to its unique properties including porous structure, good dispersion of NiCo NPs over 3D-(N)G, consolidated interaction between 3D-(N)G and NiCo NPs, and synergistic effect between two metals.
17 citations
TL;DR: In this article , the synergistic effect of polydopamine interface layer, polytetrafluoroethylene (PTFE) and ammonium perchlorate (AP) on the combustion performance and agglomeration of nano-aluminum powders was studied in the lean oxygen environment.
17 citations
TL;DR: Friction sensitivity of ammonium perchlorate (AP) composite propellants has been studied experimentally by means of thermal analysis and micro-thermocouple techniques as mentioned in this paper, and the results of friction sensitivity test show that the samples are sensitized when the concentration of catalysis which are used for high burning rate propellants is increased.
Abstract: Friction sensitivity of ammonium perchlorate (AP) composite propellants has been studied experimentally by means of thermal analysis and micro-thermocouple techniques. Several types of catalysts were mixed with AP in order to examine the effect of the reactivity on the sensitivity. The results of friction sensitivity test show that the samples are sensitized when the concentration of catalysis which are used for high burning rate propellants is increased. Metal contents within the catalysts tend to give some effects on the friction sensitivity. Based on the results of the temperature profile measurements in combustion waves, it is found that the friction sensitivity is correlated with the burning surface temperature of the propellants. The catalysts which accclerate the AP decomposition are responsible for the friction sensitivity but not for the fallhammer sensitivity.
17 citations
TL;DR: In this paper, a thermocouple traverses in the combustion zones revealed that the flame structure of the RDX/AP propellants consists of two types of flames: one type is the diffusion flame streams produced by the decomposed gases of the AP particles and the binder; the other type is a premixed flame produced by either the deconditioned gases of RDX particles and/or binder.
Abstract: The burning rate characteristics of RDX (cyclotrimethylene trinitramine)/AP (ammonium perchlorate) composite propellants were intermediate between the characteristics of RDX and AP composite propellants. Fine thermocouple traverses in the combustion zones revealed that the flame structure of the RDX/AP propellants consists of two types of flames: one type is the diffusion flame streams produced by the decomposed gases of the AP particles and the binder; the other type is the premixed flame produced by the decomposed gases of the RDX particles and/or the binder. Thus, the flame structure above the burning surface appeared to be very heterogeneous. The heat feedback from the gas phase to the burning surface was significantly reduced by the reduced reaction rate of the RDX premixed flame. Therefore the burning rate of the RDX/AP propellants was lower than that of the AP propellants. The burning rate of the RDX/AP propellants was also affected by the type of binder used. The effect of the binder on the physical and chemical processes of the RDX/AP propellant burning was the alteration of the burning surface structure and the alteration of the burning rate of the AP particles in the propellants.
17 citations
TL;DR: In this article, the authors showed that capture is dependent on antisol- vent-to-solvent ratio; increased quantities of antisolvent lead to faster nucleation rates, smaller crystals, and proved capture, while the crystal habit formation is modified by the addition of nanoparticles, resulting in highly uniform rod-like crystal structures.
Abstract: Energetic crystals with nanoparticle inclusions were preparated and characterized, focusing on the nano- sized iron(III) oxide-ammonium perchlorate system, gener- ated using an ethyl acetate/acetone antisolvent:solvent system. It is shown that capture is dependent on antisol- vent-to-solvent ratio; increased quantities of antisolvent lead to faster nucleation rates, smaller crystals, and im- proved capture. Additionally, the crystal habit formation is modified by the addition of nanoparticles, resulting in highly uniform rod-like crystal structures. Results with nanoaluminum-ammonium perchlorate and nanoalumi- num-cyclotrimethylenetrinitramine (RDX) systems have shown similar capture behavior.
17 citations