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Shock compression of reactive powder mixtures

机译：反应性粉末混合物的冲击压缩

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The shock compression of reactive powder mixtures can yield varied chemical behaviour with occurrence of mechanochemical reactions in the timescale of the high pressure state, or thermochemical reactions in the timescale of temperature equilibration, or simply the creation of dense packed highly reactive state of material. The principal challenge has been to understand the processes that distinguish between mechanochemical (shock induced) and thermochemical (shock assisted) reactions, which has broad implications for the synthesis of novel metastable or non-equilibrium materials, or the design of highly configurable next generation energetic materials. In this paper, the process of shock compression in reactive powder mixtures and the associated role of various intrinsic and extrinsic characteristics of reactants in the triggering of ultrafast shock induced chemical reactions are discussed. Experimental techniques employing time resolved diagnostics and results which identify the occurrence of shock induced reactions are reviewed. Conceptual and numerical models used to describe the heterogeneous nature of such reactions through mesoscopic details of shock compression are presented. Finally, a discussion of the application of recent results for the design of reactive material systems with controlled reaction initiation and energy release characteristics is provided.
机译：反应性粉末混合物的冲击压缩可产生变化的化学行为，其中在高压状态的时间尺度内发生机械化学反应，在温度平衡的时间尺度内发生热化学反应，或仅形成材料的密堆积高反应性状态。主要的挑战是要理解区分机械化学反应（电击诱导）和热化学反应（电击辅助）的过程，这对合成新的亚稳态或非平衡材料或设计高度可配置的下一代高能材料具有广泛的意义。材料。在本文中，讨论了反应性粉末混合物中冲击压缩的过程以及反应物的各种内在和外在特性在触发超快冲击诱导的化学反应中的相关作用。审查了采用时间分辨诊断方法的实验技术和鉴定冲击诱发反应发生的结果。提出了概念和数值模型，用于通过冲击压缩的介观细节描述此类反应的异质性。最后，讨论了最近结果在设计具有受控反应引发和能量释放特性的反应性材料系统中的应用。

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