The Supercritical Gas Ultrafine Graded Experimental Study And Mechanism Of Nto Discussed

In the paper,the development in preparing ultrafine explosive at home and abroad is comprehensively analyzed,and a disquisitive content was set up by consulting the domestic and overseas correlative datum,that is NTO ultrafine and particle gradation with using supercritical CO2 anti-solvent. The mechanism of nucleation and crystal-growth in GAS process is analyzed.The material scheme was made up of two parts, namely ultrafine and particle gradation of NTO by GAS.First, the effect of initial temperature, pressure and rate of pressure rise on the particle size and morphology of explosives produced by GAS recrysallization process is studied from experiment and analyzed from the view of recrystallization.The results show that the effect of temperature on particle size is much smaller than that of pressure,the crystal morphology is cube when the experimental temperature is 53℃,and small particle size with narrow size distribution can be obtained in low pressure and high rate of pressure rise ,otherwise big particle size with wide size distribution can be obtained. Study showed that particle gradation can be obtained by controlling pressure and rate of pressure rise in differential stage of one experiment, and the main effect on the ratio of particle size and quantity is discussed in the particle gradation. The particle gradation is good when pressure is 3MPa,10MPa and the rate of pressure rise is 5MPa/min,5MPa/h respectively, which will establish experimental and theoretical foundation for future work.