Science and Technology on Combustion, Internal Flow and Thermo-structure Laboratory, Northwestern Polytechnical University, Xi'an 710072, China.
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
Langmuir. 2023 Jun 6;39(22):7863-7875. doi: 10.1021/acs.langmuir.3c00711. Epub 2023 May 23.
Aluminum hydride (AlH) is a promising fuel component of solid propellant, but its stabilization is still challenging. Herein, surface functionalization of hydrophobic perfluoropolyether (PFPE) followed by ammonium perchlorate (AP) coating has been implemented. In particular, AlH@PFPE@AP ( = 10, 30, 50, or 64.21%) composites (AHFPs) were prepared by a spray-drying technique. The PFPE-functionalized AlH with a hydrophobic surface shows an increased water contact angle (WCA) from 51.87° to 113.54°. Compared with pure AlH, the initial decomposition temperatures of AHFPs were increased by 17 °C, and the decomposition properties of AP in the AHFPs were also enhanced with significantly decreased peak temperature and fairly increased energy output. Moreover, the decomposition induction time of AHFPs-30% was improved by almost 1.82 times that of raw AlH, which indicates that the coatings of PFPE and AP could improve the stability of AlH. The maximum flame radiation intensity of AHFPs-30% was 21.6 × 10, which is almost 7.71 times that of pure AlH (2.8 × 10).
氢化铝（AlH）是固体推进剂中很有前途的燃料成分，但它的稳定性仍然具有挑战性。本文采用疏水全氟聚醚（PFPE）表面功能化，然后进行高氯酸铵（AP）涂层，实现了其稳定化。特别地，采用喷雾干燥技术制备了 AlH@PFPE@AP（ = 10、30、50 或 64.21%）复合材料（AHFPs）。具有疏水性表面的 PFPE 功能化 AlH 的水接触角（WCA）从 51.87°增加到 113.54°。与纯 AlH 相比，AHFPs 的初始分解温度提高了 17°C，并且 AHFPs 中 AP 的分解性能也得到了增强，峰值温度显著降低，能量输出相当增加。此外，AHFPs-30%的分解诱导时间提高了近 1.82 倍，表明 PFPE 和 AP 的涂层可以提高 AlH 的稳定性。AHFPs-30%的最大火焰辐射强度为 21.6×10，几乎是纯 AlH（2.8×10）的 7.71 倍。
