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

• DOI: 10.1021/acsami.3c11961
• Publication Date: 2023-11-17T15:42:23Z
• Authors: Ruixuan Xu; Minghui Yu; Zhihua Xue; Haorui Zhang; Qi-Long Yan
• Keywords: Burn rate (chemistry); Autoignition temperature; Thermite

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