Study Of Preparation And AP/RDX Catalytic Properties Of New Nitro Complexes Particles

It is one of the most effective method to adding catalyst to improve the combustion performance of oxidant and energetic materials (AP and RDX) in solid propellant. In the present work, two new catalysts were synthesized by two different methods mainly for the thermal decomposition characteristics of AP and RDX, and studied thermal decompositionan and catalytic properties of these two catalysts systematically. The main research contents are as follows.Firstly, potassium lead hexanitrocuprates(Ⅱ) (K22Pb[Cu(NO2)6]) and potassium lead hexanitrocobaltate(II) (K2Pb[Co(NO2)6]) with different particle size and morpHology were synthesized by reverse microemulsion method and co-precipitation method which dispersed by PVP, and discussing the different experimental factors on particle size and morpHology of products.K2Pb[Cu(NO2)6] and K2Pb[Co(NO2)6] particles with hexagonal appearances when synthesized with the presence of PVP, and particle size was decreased with the increasing in the amount of PVP and the decreasing of reactant concentration. Both of these products became smaller with cubic morpHology when synthesized by reverse microemulsion method. The products were also identified as monoclinic structure by XRD and XPS, thermal decomposition characteristics were identified by DSC-TG-IR.Secondly, thermal decomposition characteristics of AP and RDX were tested under the influence of the two catalysts. The results show that the low-temperature decomposition peak and high-temperature decomposition peak of AP decreased simultaneously, and the heat release was also increased greatly, The high-temperature decomposition of AP reduced by 137.16℃under the catalysis of K2Pb[Co(NO2)6] (d0.5=0.8μm) with cubic morphology. The melting endothermic peak of RDX was increased slightly and heat release increased under the influence of the catalysts. The catalytic effect became better with the particles size decreased, and K2Pb[Co(NO2)6] has a better catalytic effect compared to K2Pb[Cu(NO2)6].Finnally, catalytic mechanism of K2Pb[Cu(NO2)6] and K2Pb[Co(NO2)6] were investigated, it indicated that the nitrogen oxides played a decisive role in pre-thermal decomposition. Co-catalyst of variety of metal oxides has a great impact on high-temperature decomposition. The concept of gas catalytic was proposed for the fist time.