Preparation and Properties of RDX/Al/SiO_2 Nano-composite Energetic Materials
ZHANG Dong-dong;HUANG Yin-sheng;LI Rui;LI Meng;WANG Jun-jie;GE Meng-zhu;ZHANG Hui-jian;HE Ya-li;School of Chemical Engineering,Nanjing University of Science and Technology;Ministerial Key Laboratory of ZNDY,Nanjing University of Science and Technology;
To reduce the mechanical sensitivity of RDX and improve its thermal decomposition performance,three kinds of RDX/Al/SiO_2 nano-composite energetic materials of RDX/Al mass fraction as 30%,50% and 70% respectively(the mass ratio of RDX to Al is6 ∶ 1) were prepared by sol-gel method using tetramethoxysilane as precursor and fluorine boric acid as catalyst. Their morphology and structurre were characterized by scanning electron microscopy(SEM),energy dispersive spectrometer(EDS) and X-ray diffraction(XRD). Thermal performances of the samples were investigated by thermogravimetric analysis(T G) and differential scanning calorimetry(DSC). The mechanical sensitivity of the samples was measured according to GJB772A-1997 method. The results show that the RDX/Al/SiO_2 is the nano-composite energetic material formed by the Al and RDX into the skeletonn of gel as SiO_2. The minimum particle size of RDX in composite material is 65.09 nm,with increasing the RDX-Al content,its average particle size increases.When the mass fraction of RDX-Al is 30%,compared with the pure RDX,the decomposition temperature of RDX in the composite material decreases by 22.4 ℃,compared with the raw material RDX,the characteristic drop height(H50) of the sample increases by 108.6 cm and the percentage of explosion decreases by 60%.
【CateGory Index】： TQ560.1