| For nano CuO, one of the important uses is to enhance the combustion performance and energy performance of solid propellant as the combustion catalyst. Different dispersion approach were investigated in detail, which made differences with the dispersibility of CuO to the performance of propellant. Characterization technologies of dispersibility were also studied.Firstly, nano CuO/AP composite particles were prepared by using ball milling machine. To compare the dispersibility and catalytic performance, simple mixed sample of nano CuO and ammonium perchlorate (AP) had also been prepared. The dispersion of CuO in two kinds of samples was investigated by Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM). It is discovered that CuO had preferable dispersibility in nano CuO/AP composite particles. Meanwhile, the catalytic effect on AP was investigated via DSC. Compared with the fine AP, the high exothermic peak of simple mixed sample of nano CuO and AP particles and nano CuO/AP composite particles dropd down respectively by 112.49℃and 137.28℃. That is to say CuO/AP composite particles showed better catalytic effect on AP.Secondly, propellant samples had been prepared according to traditional technology (simple mixed sample of CuO and AP) and compound pre-dispersion technology (CuO/AP composite particles). The results of compound pre-dispersion samples indicated that the RSD of explosion heat of different regions decreased, compared to the simple mixed sample. That is to say CuO had preferable dispersibility in the compound sample, which led to a better combustion stability. The test results of the nano-CuO/AP nipping with 2 hours indicated that the burning rate increased respectively by 15.15%,7.79%,6.52% at the pressure of 3.0MPa, 6.0MPa and 8.0MPa, and the pressure exponents decreased by 19.57% compared with the simple mixed sample nipping with 2 hours.The content of copper in ignitionresidue was tested by chemical titration, AAS, ICP after the combustion of solid propellant. Meanwhile, test results of three methods were compared. Compared to the sample of nano CuO/AP nipping with 2 hours, the RSD of the content of copper decreased respectively by 24.00%,63.03% and 9.64% for the sample of nano-CuO/AP nipping with 3 hours. It is illustrated that appropriately increasing kneading time can improve the dispersibility of nano CuO.Finally, the effect of the dispersion of nano CuO on its catalysis to propellant was investigated. The study found, for the same kneading time, the high exothermic peak of CuO/AP dropd down sharply even more than simple mixed sample of CuO and AP. And the high exothermic peak of two samples dropd down respectively by 1.82℃and 12.75℃compared with the standard sample. The results showed that the dispersibility of nano CuO has been enhanced owing to the pre-dispersion technology, which made the thermal decomposition of sample more complete. |
