Thermally-Driven Changes to Porosity in TATB-Based High Explosives,Propellants, Explosives, Pyrotechnics

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Thermally-Driven Changes to Porosity in TATB-Based High Explosives
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-05-21 , DOI: 10.1002/prep.202100022
Christopher L. Armstrong ₁ , Joseph T. Mang ₁

Affiliation

Ultra-small- and small-angle neutron scattering techniques were employed to quantify thermally driven changes to the microstructure of the TATB-based composite high explosive, PBX 9502. Samples of PBX 9502 were studied in-situ at temperatures ranging from 25 to 220 °C and after re-equilibration at ambient temperature. Significant changes to the void size and morphology within the PBX 9502 microstructure were observed upon heating and are consistent with the known increase in the shock sensitivity of thermally-treated PBX 9502. More extensive microstructural changes were found after the thermally treated samples were re-equilibrated at ambient temperature. Utilizing a model of ramified porosity, the size and the volume and surface dimensions of voids in the PBX 9502 microstructure were quantified as a function of temperature. The temperature dependence of the void radius of gyration is well correlated with the known increase in the shock sensitivity of PBX 9502 with increasing temperature, providing a microstructural origin for the increased shock sensitivity of PBX 9502 at elevated temperatures.

中文翻译：

基于 TATB 的高爆炸药中孔隙度的热驱动变化

采用超小和小角度中子散射技术来量化基于热驱动的 TATB 复合高炸药 PBX 9502 微观结构的变化。 PBX 9502 样品在 25 到 220° 的温度范围内进行了原位研究C 和在环境温度下重新平衡后。加热后观察到 PBX 9502 微观结构内的空隙大小和形态发生显着变化，这与热处理 PBX 9502 的冲击敏感性的已知增加一致。热处理样品重新平衡后发现更广泛的微观结构变化在环境温度下。利用分枝孔隙率模型，PBX 9502 微观结构中空隙的大小、体积和表面尺寸被量化为温度的函数。

更新日期：2021-05-21

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