超细HMX的制备与表征研究

Preparation and Characterization of Ultrafine HMX Particles

通过喷雾干燥HMX丙酮溶液,制备了粒径为3μm左右超细粒子,分析了粒径的影响因素,并表征了制备产物。X射线衍射分析(XRD)显示超细粒子的晶型仍为β型,用扫描电镜(SEM)观察发现部分粒子呈壳状,热重.差示扫描量热计联用(TG-DSC)分析表明超细后HMX的转晶温度明显降低。

The fine HMX particles were prepared by spray drying method. HMX was dissolved in acetone and the solution treated by spray dryer ,then the particles with mean size of about 3μm obtained. The factors that affect particle size distribution have been analyzed,and the size distribution of ultrafine HMX particals reduces with flow rates of HMX resolution decreasing and flow rates of air increasing. X-ray diffraction ( XRD ) shows that the fine HMX particles are β-phase, and there is no phase transition in the process of preparation. Scanning Electron Microscopy ( SEM ) photograph indicates that many particles have shapes of hollow. Thermogravimetric and Differential Scanning Calorimetric ( TG-DSC ) spectroscopy displays that structural phase transition of fine HMX takes place at lower temperature comparing to that of gross granule.