Carbon nanofibers(CNFs)are introduced into the nitroguanidine gun propellant system to investigate its effects on structure and properties of the gun propellant.The structure and composition of the sample are characterized by scanning elec-tron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR)and Raman spectroscopy(Raman).Differential scan-ning calorimetry(DSC)is used to analyze the thermal decomposition behavior and kinetics of the propellant by the Kissinger and the Ozawa methods.The effect of CNFs on the combustion performance of nitroguanidine gun propellant is studied by closed bomb test,and the impact strength tests are carried out.The results show that the structure of nitroguanidine gun pro-pellant modified by CNFs is stable.Compared with the blank sample,the activation energy(Ea)of thermal decomposition of the gun propellant sample containing 1％(mass fraction)CNFs increases from 200.62kJ/mol to 208.65kJ/mol,reflecting the improvement of thermal stability.The gun propellant containing CNFs can burn steadily and appropriate amount of CNFs have a good regulatory effect on its combustion process.In addition,adding appropriate amount of CNFs can effectively improve the impact strength of the propellant.The impact strength of the sample with 0.5％CNFs is improved by 26.03％compared with the blank sample at low temperature.
维普
万方数据