Research on Autocatalytic Thermal Decomposition Properties and Thermal Safety of CL-20

doi:10.3969/j.issn.1000-1093.2018.01.006

Abstract

Abstract: Hexanitrohexaazaisowurtzitane (CL-20) is a very important type of explosive, and its thermal decomposition safety has been paid attention. Differential scanning calorimetry (DSC) technique is employed to study the thermal decomposition and safety parameters of CL-20. The “interruption-rescanning ” and Swiss methods are further applied to evaluate the autocatalytic effect of CL-20 during thermal decomposition, which is verified by isothermal DSC experiments. The decomposition kinetic parameters of CL-20 are determined by using the Friedman isoconversional method. The kinetic parameters with heat balance are analyzed and used to simulate the time to the maximum reaction rate under adiabatic conditions (TMR_ad). It is indicated that the initial thermal decomposition temperature is in the range from 233.5 to 255.7 ℃ at the heating rates of 2, 5, 10 and 20 ℃/min. Thermal history significantly influences the thermal stability of CL-20, where the preheating decreases its initial thermal decomposition temperature and the peak temperature. T_D8 and T_D24 of CL-20 were obtained to be 162.3 ℃ and 152.8 ℃, respectively. Key

Key words: hexanitrohexaazaisowurtzitane, autocatalysis, interruptionandre-scanningmethod, Swissmethod, thetimetothemaximumreactionrateunderadiabaticcondition

CLC Number:

TQ564.4⁺2

WANG Kai， XIAO Song， SHEN Xiao-li， GUO Tian-ji， TU Jian， LIU Da-bin. Research on Autocatalytic Thermal Decomposition Properties and Thermal Safety of CL-20[J]. Acta Armamentarii, 2018, 39(1): 57-62.

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第39卷
第1期2018 年1月兵工学报ACTA
ARMAMENTARIIVol.39No.1Jan.2018

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