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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN En Línea: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2015011266
pages 295-306

PREPARATION AND CHARACTERIZATION OF ULTRAFINE ε-HEXANITROHEXAAZAISOWURTZITANE PARTICLES

Chongwei An
School of Chemical and Environmental Engineering, North University of China, Taiyuan, Shanxi 030051, P.R. China
Binshuo Yu
Chemical Industry and Ecology Institute, North University of China, Taiyuan, Shanxi 030051, P.R. China
Hequn Li
School of Chemical and Environmental Engineering, North University of China, Taiyuan, Shanxi 030051, P.R. China
Wenjian Guo
Chemical Industry and Ecology Institute, North University of China, Taiyuan, Shanxi, 030051, China
Jing-Yu Wang
School of Chemical and Environmental Engineering, North University of China, Taiyuan, Shanxi 030051, P.R. China

SINOPSIS

In this study, ultrafine ε-hexanitrohexaazaisowurtzitane (CL-20) particles were prepared by the high-pressure jet assisted precipitation method. The CL-20 samples were characterized by scanning electron microscopy (SEM), particle size analyzer, X-ray diffraction (XRD), and Fourier transformation infrared spectroscopy (FT-IR). Furthermore, the safety properties of samples under impact and thermal stimulus were tested and investigated. The results of SEM and particle size analysis indicate that ultrafine CL-20 particles, with a narrow particle size distribution, are about 300 nm in size and elliptical in shape. The XRD patterns and FT-IR spectra indicate that the polymorphic phase of ultrafine CL-20 particles are mainly ε-type. The differential scanning calorimetry results indicate that compared with those of raw CL-20, the exothermic decomposition peak temperature of ultrafine CL-20 decreases by about 5°C at different heating rates. The apparent activation energy of ultrafine CL-20 is about 10 kJ/mol higher than that of raw CL-20. However, the ultrafine samples have the lower thermal explosion critical temperature and higher decompose rate constant at 230° C. Compared with that of raw CL-20, the impact sensitivity of ultrafine CL-20 has been decreased significantly, for the drop height (H50) is increased from 12.8 to 32.1 cm.


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