Preparation And Study Of Micro - Bubble Blowing Ball

The oblate spherical gun propellants have been commonly used in small arms in many countries which improve the ballistic performance obviously. Using the oblate spherical gun propellants can lower the temperature of the weapon system, improve the charge density and the burning performance of the system effectively. Based on a large number of articles about the oblate spherical gun propellants, this article uses supercritical CO₂ as physical foaming agent to prepare the oblate spherical gun propellants with micro cells through the temperature-induced foaming method. Research the influence of the foaming process conditions on the inner morphology and the burning characteristics of the porous oblate spherical gun propellants. The main research contents and results are summarized as follows:（1） Combined with the diffusion theory of the supercritical CO₂ liquid and the dissolved quantity measurement principle in oblate spherical propellants, this article researches the effect of the saturation pressure and the saturation temperature on the amount of the supercritical CO₂ dissolved in the propellants. The results indicate that the amount of dissolved increases with the increase of the saturation pressure and decreases with the increase of the saturation temperature. The conclusion is that the conditions of saturation process is high pressure and low temperature.（2） Preparing the oblate spherical gun propellants with micro cells through the temperature-induced foaming method to research the effects of desorption time and the addition of the solvent. The results indicate that the foaming density and diameter of the foamed propellants decrease with the increase of desorption time, and the skins of the foamed propellants become thicker when desorption time increases.（3） This article shows that the foaming temperature and the foaming time can adjust the morphology of the cells. With the increase of the foaming time, the cell density of the foamed propellants decreases and the cell diameter gets larger. The cell density and diameter increase when the foaming temperature get higher. The addition of solvent with high polarizability improves the cell density and diameter of the foamed propellants.（4） The quenched combustion experiment showed that the foamed propellants obey the parallel-layer combustion. The closed vessel experiments were used to explore the burning process of porous propellants, the results showed that the foamed propellants burn faster than the unfoamed samples.