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Preparation of Sub‐Micron Sized CL‐20 and Its Mechanical and Thermal Properties
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-09-14 , DOI: 10.1002/prep.202000137 Xiaoxiang Mao 1 , Longfei Jiang 2 , Yifan Li 2 , Xiaoming Wang 3 , Yanchun Li 2
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-09-14 , DOI: 10.1002/prep.202000137 Xiaoxiang Mao 1 , Longfei Jiang 2 , Yifan Li 2 , Xiaoming Wang 3 , Yanchun Li 2
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High sensitivity limits the broad application of CL‐20 despite that it is considered as the most powerful explosive. Numerous efforts and technologies of fabricating CL‐20 with small particle size have been implemented for solving this problem. In this study, CL‐20 with sub‐micron particle size was prepared by superfine comminution technique. The results of impact and friction sensitivities tests showed that the mechanical sensitivities of CL‐20 were improved after ultra‐fine treatment. DSC results showed that the decomposition of CL‐20 advanced with the particle sizes decreased. The sub‐micron sized CL‐20 showed lower activation energy (Eα) compared to that of raw CL‐20, suggesting that particle size reduction is in favour of decreasing the threshold of decomposition. The reaction models of CL‐20 with different particle sizes could all be categorized as n‐th order reactions with autocatalysis. The function of reaction mechanism could be expressed as f(α)=(1‐α)n(1+kcat•α). On aspect of heat sensitivity, the results of deflagration point tests showed that although particle size had little influence on the deflagration point with 5 s delay time (Tb) of CL‐20, apparent activation energy of explosion (Eb) decreased apparently with the particle sizes decreased, which could impact the thermal sensitivity significantly.
中文翻译：
亚微米级CL-20的制备及其力学和热学性能
高灵敏度限制了CL-20的广泛应用，尽管它被认为是最强大的爆炸物。为了解决这个问题，已经进行了许多努力和技术来制造小粒径的CL-20。在本研究中，通过超细粉碎技术制备了亚微米粒度的CL-20。冲击和摩擦敏感性测试的结果表明，CL-20的机械敏感性经过超精细处理后得到了改善。DSC结果表明，CL-20的分解随着粒径的减小而进行。亚微米大小的CL-20显示出较低的活化能（Ë α）与原始CL-20相比，表明减小粒度有利于降低分解阈值。具有不同粒径的CL-20的反应模型都可以归为具有自催化作用的n阶反应。反应机理的函数可以表示为f（α）=（1-α）n（1 + k cat •α）。在热敏性方面，爆燃点试验的结果表明，尽管颗粒尺寸对CL-20的5 s延迟时间（T b）对爆燃点几乎没有影响，但爆炸的表观活化能（E b）明显降低。颗粒尺寸减小，这可能会显着影响热敏性。
更新日期：2020-09-14
中文翻译：
亚微米级CL-20的制备及其力学和热学性能
高灵敏度限制了CL-20的广泛应用，尽管它被认为是最强大的爆炸物。为了解决这个问题，已经进行了许多努力和技术来制造小粒径的CL-20。在本研究中，通过超细粉碎技术制备了亚微米粒度的CL-20。冲击和摩擦敏感性测试的结果表明，CL-20的机械敏感性经过超精细处理后得到了改善。DSC结果表明，CL-20的分解随着粒径的减小而进行。亚微米大小的CL-20显示出较低的活化能（Ë α）与原始CL-20相比，表明减小粒度有利于降低分解阈值。具有不同粒径的CL-20的反应模型都可以归为具有自催化作用的n阶反应。反应机理的函数可以表示为f（α）=（1-α）n（1 + k cat •α）。在热敏性方面，爆燃点试验的结果表明，尽管颗粒尺寸对CL-20的5 s延迟时间（T b）对爆燃点几乎没有影响，但爆炸的表观活化能（E b）明显降低。颗粒尺寸减小，这可能会显着影响热敏性。
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