Catalytic effects of nano additives on decomposition and combustion of RDX-, HMX-, and AP-based energetic compositions

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In this work, the preparation and combustion catalysis effects of Cu 2 OÀPbO/GO and CuOÀBi 2 O 3 /GO nanocomposites were systematically investigated. It was shown that the burning rate of the DB propellants can be significantly enhanced by both the nanocomposite catalysts, with reduced pressure exponent. In particular, the Cu 2 OÀPbO/GO induced a burn rate enhancement for DB propellant in pressure range of 2-14 MPa, with the maximum catalytic efficiency of 3.87 at 2 MPa. More interestingly, it resulted in "mesa" burning of DB propellant in the pressure range of 12-20 MPa (n =-0.05). The CuOÀBi 2 O 3 /GO have the same effect with a burning rate increasing from 2.15 to 8.57 mm s À1 at 2 MPa. Similarly, for the RDX-CMDB propellant, the GO-based composites of Cu 2 OÀPbO/GO and CuOÀBi 2 O 3 /GO showed evident catalytic activities. Plateau combustion was achieved in their presence, which is of great importance for practical applications. The catalysis effects of the two composites are closely related to the high dispersion of metal oxide particles and GO with excellent thermal conductivity.

Section: Introductionmentioning

confidence: 99%

Preparation and Evaluation of Effective Combustion Catalysts Based on Cu(I)/Pb(II) or Cu(II)/Bi(II) Nanocomposites Carried by Graphene Oxide (GO)

Zhao²,

Yan

et al. 2018

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“…Fe 2 O 3 could reduce activation energy and reaction temperature. For APbased aluminized composite propellants, the mixture of Fe 2 O 3 as a high-energy ingredient and micro/nano aluminum could form Al/Fe 2 O 3 thermites, which could contribute more energy release and further improve the burning rate of the propellants [20]. However, it is easy for micro/nano the viscosity of solid propellant during processing.…”

Section: Introductionmentioning

confidence: 99%

Study on Burning and Thermal Decomposition Properties of HTPB Propellant Containing Synthesized Micro‐nano Ferric Perfluorooctanoate

Zhen

Zhou

Wang

et al. 2019

A novel micro‐nano ferric perfluorooctanoate [Fe(PFO)3] was prepared and added in AP/Al/HTPB composite solid propellant as a catalyst to study its effects on burning and thermal decomposition properties of the propellant. To further discuss the possible thermal mechanism of the propellant containing Fe(PFO)3, the major effects of Fe(PFO)3 catalyst on Al were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and X‐ray diffraction (XRD). Results show that By adding 3 w.t.% Fe(PFO)3, the burning rate could increase by 27.8 % at 3 MPa, meanwhile, the pressure exponent decreased. The aggregation/agglomeration process of the propellant containing Fe(PFO)3 efficiently suppressed, and the particle size of condensed combustion products decreased clearly. In addition, Fe(PFO)3 could reduce the thermal decomposition temperature of the propellant and enhance the heat release. Thermite reaction between decomposition products of Fe(PFO)3 and Al was triggered at 635 °C, resulting in heat release and formation of α‐Al2O3.

“…Its content is about 70-90 % by mass, the thermal decomposition of AP has been widely investigated [5][6][7][8]. The addition of burning catalyst is identified as the most efficient method to improve the combustion performance of composite propellants [9][10][11][12][13][14][15]. However, adding inert catalysts will reduce the energy of composite propellants.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Energetic Complexes [Co(en)(H₂BTI)₂]₂ ⋅ en, [Cu₂(en)₂(HBTI)₂]₂ and Catalytic Study on Thermal Decomposition of Ammonium Perchlorate

Liu

Qiu

Han

et al. 2019

A nitrogen‐rich compound 4,5‐bis(1H‐tetrazol‐5‐yl)‐1H‐imidazole (H3BTI) with high energy density has been reported as ligand to make metal‐organic energetic catalysts to improve the energy of catalysts for the first time. The high energetic catalysts [Co(en)(H2BTI)2]2 ⋅ en and [Cu2(en)2(HBTI)2]2 were successfully synthesized and the structures of the complexes were confirmed by X‐ray single‐crystal diffraction. The catalytic effects of complexes on the thermal decomposition of ammonium perchlorate (AP) have been investigated separately by differential scanning calorimetry (DSC). The DSC results show that the AP can be completely decomposed at the temperature of 333.7 °C and 336.1 °C, respectively, which indicates that the pristine “two‐step” thermal decomposition of AP was transformed to a “one step” route upon addition of the copper catalysts. Besides the excellent catalytic performance of AP decomposition, the high energetic ligand HnBTI can also release a large number of heats in the decomposition process, which can significantly enhance the total released heat of the mixture of AP.