基于超声辅助等静压成型含能材料致密度的提升

Improving Compactness of Energetic Materials by Ultrasonic⁃assisted Isostatic Pressing

为了进一步提高含能材料等静压成型的致密度,提出了一种超声辅助的等静压成型方法,设计了试验样机。利用COMSOL对单个超声振子和整个超声辅助成型系统激发的声场进行了分析,研究了包套厚度、10 MPa预压力和超声电源电压幅值对声场分布的影响。仿真结果表明了超声辅助等静压成型的可行性。在有无施加超声、有无10 MPa预压力的条件下进行了高聚物粘结炸药代用材料的成型实验,利用计算机断层扫描和扫描电镜分别对实验样件进行了测试分析,结果表明:施加了超声和10 MPa预压力的材料内部的均匀性和致密度优于未加超声、未加预压力和仅施加超声的材料,并且其内部晶粒更细、分布更均匀。

In order to further improve the compactness of energetic powder materials,an ultrasonic‑assisted isostatic pressing method is proposed,and an experimental prototype is designed and produced.The simulation software COMSOL is used to analyze the sound field of a single ultrasonic vibrator and the whole isostatic ultrasonic assisted molding system,and the influence of the cover thickness,10 MPa pre‑pressure and ultrasonic power voltage amplitude on the sound field distribution is studied.The simulation results show the rationality and feasibility of the ultrasonic‑assisted isostatic pressing.The press molding experiments of polymer‑bonded explosive(PBX)simulants are carried out whether to consider ultrasonic‑assisted and 10 MPa pre‑pressure conditions.The computed tomography(CT)and scanning electron microscope(SEM)are used to test and analyze the sam‑ples.The results show that the internal uniformity and compactness of the materials with ultrasonic‑assisted and 10 MPa pre‑pressure are better than those materials without,and their internal grains are finer and the grain distribution is more uniform.