The Preparation Of Nanometer Metal Oxide And Its Application In Delay Composition

In this paper, nano-CuO, NiO and Fe2O3were prepared by methods commonly used in the preparation of nanometer metal oxides including liquid and solid-phase and characterized by XRD,TEM analytical techniques. The test result shows that nano-CuO prepared by different materials and methods at35.552°,38.692°,48.939°,61.598°have great peaks intensity. This indicates nano-CuO has a good crystalline. The TEM images show the dispersion of prepared CuO nanoparticles is preferable, spherical particle size distribution, average particle size are20-30nm,30-40nm,10nm,30nm. Nano-NiO at37.189°,43.162°,62.538°have strong diffraction peaks and intensity. The TEM images show that the average particle in the nano-NiO was20-30nm, spherical. Nano-Fe203in the corresponding angles also have strong diffraction peaks. The TEM images show that the Fe2O3nanoparticles prepared by homogeneous precipitation method is better than the solid-phase method. Its best calcined is500℃and the particle size is within100nm.In order to study the effect on the burning performance of the tungsten type delay composition, the smaller particle size and uniform distribution of nano-CuO, NiO, Fe2O3and their pairwise mixture were choosed to add into tne tungsten type delay composition in this experiment. Experimental results show that1%,6%,8%nano-CuO improved the average burning rate and8%nano-CuO increased the maximum extension of the tungsten type delay composition.2%,4%nano-CuO reduced the burning rate; Nano-NiO and nano-Fe2O3both improved the burning rate and combustion stability of the tungsten type delay composition; Adding4%NiO and Fe2O3,4%NiO and CuO nanoparticles mixture, the average burning rate is higher than adding6%NiO and Fe2O3,6%NiO and CuO, but adding6%CuO and Fe2O3, the average burning rate is higher than adding4%CuO and Fe2O3.In order to study the impact of the thermal decomposition of the tungsten type delay composition, using TG-DSC or DSC thermal analysis methods to characterize them. Experimental results indicate that the decomposition temperature of the tungsten type delay composition obviously changes after adding nano-CuO and NiO. And with the increasing amount of nano-CuO, the greater the changes. The impact of nano-NiO on the endothermic peak of the tungsten type delay composition is great. The endothermic peak of the tungsten type delay composition slightly ahead after the addition of nano-Fe2O3and the second exthermic peak became sharp. The effect of nano mixture on the thermal performance of the tungsten type delay composition mainly reflects the exothermic peak numbers and decomposition temperature. And the influence of nano-CuO and Fe2O3mixture on the thermal decomposition temperature is the most obvious.