六硝基六氮杂异戊兹烷自催化分解特性与热安全性研究

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

六硝基六氮杂异戊兹烷(CL-20)是一种十分重要的新型单质炸药,其热分解安全性一直备受关注。利用动态差示扫描量热(DSC)仪进行实验,初步研究了CL-20的热行为;利用中断回归法、瑞士方法研究了CL-20的自催化反应特性,并用等温DSC实验进行了验证;基于CL-20的动态DSC曲线数据,采用Friedman法求得其活化能E_α与ln[Af(α)]值随转化率α的变化曲线,并结合热平衡方程计算了其绝热诱导期TMR_(ad).结果表明:CL-20的起始分解温度为233.5~255.7℃,其分解反应为自催化反应,热履历显著降低了其起始分解温度和峰温;在反应的不同阶段,CL-20具有不同的活化能,其绝热诱导期8 h和24 h对应的温度T_(D8)和T_(D24)分别为162.3℃和152.8℃.

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 ＂interruptionrescanning＂ 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（TMRad）.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.TD8 and TD24 of CL-20 were obtained to be 162.3 ℃ and 152.8℃,respectively.