Thermally Induced Polymorphic Transformation of Hexanitrohexaazaisowurtzitane (HNIW) Investigated by in-situ X-ray Powder Diffraction

• Autorzy: Liu Y. , Li S. , Wang Z. , Xu J. , Sun J. , Huang H.

Identyfikatory

DOI

10.22211/cejem/62349

• Języki publikacji: EN

Abstrakty

EN

The ε→γ phase transition of HNIW induced by heat was investigated with in situ X-ray powder diffraction (PXRD). The effects of purity, particle size, insensitive additives and the time of isothermal heat treatment on the phase transition were evaluated. It was found that the phase transition is irreversible with changes in temperature, and the two phases can coexist in a certain temperature range. Moreover, the initial phase transition temperature increases with increasing purity and decreasing particle size of HNIW, and thus with the approximate crystal density. The addition of graphite and paraffin wax to HNIW as insensitive additives leads to a decrease in the initial phase transition temperature, but the addition of TATB does not affect the initial phase transition temperature. Thus, TATB is a suitable insensitive additive. Moreover, at the critical temperature, the isothermal time determined the efficiency of the ε- to γ-phase transition. This work lays the foundations for the choice of molding technologies, performance test methods, ammunition storage options, as well as the manufacture of HNIW-based explosive formulations.

Słowa kluczowe

EN

HNIW; polymorphism; in situ X-ray diffraction; phase transition; heat stimulation

• Czasopismo: Central European Journal of Energetic Materials
• Rocznik: 2016
• Tom: Vol. 13, no. 4
• Strony: 1023--1037
• Opis fizyczny: Bibliogr. 39 poz., rys., tab.

Twórcy

autor

Liu Y.

• School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, People’s Republic of China
• Insitute of Chemical Materials, Chinese Academy of Engineering Physics (CAEP), Mianyang 621900, People’s Republic of China

autor

Li S.

• Insitute of Chemical Materials, Chinese Academy of Engineering Physics (CAEP), Mianyang 621900, People’s Republic of China

autor

Wang Z.

• School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, People’s Republic of China

autor

Xu J.

• Insitute of Chemical Materials, Chinese Academy of Engineering Physics (CAEP), Mianyang 621900, People’s Republic of China

autor

Sun J.

• Insitute of Chemical Materials, Chinese Academy of Engineering Physics (CAEP), Mianyang 621900, People’s Republic of China

autor

Huang H.

• Insitute of Chemical Materials, Chinese Academy of Engineering Physics (CAEP), Mianyang 621900, People’s Republic of China

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).