| 초록 |
In the case of high explosives, it is essential to manufacture these substances with micron sized particles in order to enhance their performance. This study examined the effect of urea as an additive for the habit modification of energetic materials such as cyclotrimethylenetrinitramine (RDX) and cyclotetramethylenetetranitramine (HMX) crystals using supercritical antisolvent (SAS) process. The effect of solution concentration,urea concentration, temperature, and pressure on crystal habit was investigated, and the obtained products were characterized by scanning electron microscopy (SEM), particle size analyzer (PSA), powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR) spectroscopy and differential scanning calorimetry (DSC). Despite the use of urea as an additive, no detectable urea residue was found in the crystals, because urea is soluble in carbon dioxide and is effectively removed during the washing step with CO2. |
