<br>增强氧化剂内掺入铝颗粒的固体推进剂的点火和燃烧性能,ACS Applied Materials & Interfaces

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增强氧化剂内掺入铝颗粒的固体推进剂的点火和燃烧性能
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-11-17 , DOI: 10.1021/acsami.3c11961
Ruixuan Xu ₁ , Minghui Yu ₁ , Zhihua Xue ₁ , Haorui Zhang ₁ , Qi-Long Yan ₁

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铝的燃烧效率在高能铝基固体推进剂的燃烧中起着至关重要的作用。对于传统配方，铝粉分散在粘合剂基体中，导致与氧化剂的接触有限，因此通常燃烧不充分，压力指数值较高。本文通过喷雾干燥技术制备了各种核壳结构的Al/氧化剂复合材料，如Al@HMX、Al@AP和AP@Al，在此基础上，Al颗粒与氧化剂之间界面精确控制的固体推进剂被实现了。与对照样品相比，改性推进剂的爆炸热更高，为 5890 J g ^–1 （高出 15%），点火延迟时间缩短为 58 ms（降低 65%）。在不改变组分含量的情况下，推进剂的燃烧速率可以通过调整Al和氧化剂的界面接触来轻松调节，在1 MPa的相同压力下，燃烧速率在4.56–5.79 mm s ^–1的宽范围内变化。引入Al/氧化剂复合材料后，使用Al@HMX和AP@Al复合材料可以在1-15 MPa内实现0.19的最低压力指数。使用Al/氧化剂复合材料也抑制了Al的团聚，并且可以使用经典的“口袋”模型来解释该机制。此外，未反应铝含量的显着降低证实了固体推进剂燃烧效率的提高。

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Enhancing the Ignition and Combustion Performances of Solid Propellants Incorporating Al Particles Inside Oxidizers

The combustion efficiency of Al plays a critical role in the combustion of high-energy aluminum-based solid propellants. For traditional formulations, the Al powders are dispersed in the binder matrix, leading to limited contact with the oxidizers and hence usually insufficient combustion and higher values of the pressure exponent. In this paper, various core–shell structural Al/oxidizer composites such as Al@HMX, Al@AP, and AP@Al have been prepared by a spray-drying technique based on which solid propellants with precise interfacial control between Al particles and oxidizers were realized. Compared to the control sample, the modified propellants have a greater heat of explosion of 5890 J g^–1 (15% higher) and a reduced ignition delay time of 58 ms (65% decrease). Without changing the content of components, the burn rates of propellants can be easily modulated by tuning the interfacial contact of Al and oxidizers, where it varies in a wide range of 4.56–5.79 mm s^–1 at the same pressure of 1 MPa. After introducing Al/oxidizer composites, the lowest pressure exponent of 0.19 within 1–15 MPa could be achieved by using Al@HMX and AP@Al composites. The agglomeration of Al was also inhibited by using Al/oxidizer composites, and the mechanism can be interpreted by using a classical “pocket” model. Moreover, the improved combustion efficiency of the solid propellants was verified by a noticeable reduction in the unreacted Al content.

更新日期：2023-11-17

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