首页|Micro-aluminum powder with bi-or tri-component alloy coating as a promising catalyst:Boosting pyrolysis and combustion of ammonium perchlorate

Micro-aluminum powder with bi-or tri-component alloy coating as a promising catalyst:Boosting pyrolysis and combustion of ammonium perchlorate

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A novel design of micro-aluminum(μAl)powder coated with bi-/tri-component alloy layer,such as:Ni-P and Ni-P-Cu(namely,Al@Ni-P,Al@Ni-P-Cu,respectively),as combustion catalysts,were intro-duced to release its huge energy inside Al-core and promote rapid pyrolysis of ammonium perchlorate(AP)at a lower temperature in aluminized propellants.The microstructure of Al@Ni-P-Cu demonstrates that a three-layer Ni-P-Cu shell,with the thickness of～100 nm,is uniformly supported by μAl carrier(fuel unit),which has an amorphous surface with a thickness of～2.3 nm(catalytic unit).The peak temperature of AP with the addition of Al@Ni-P-Cu(3.5％)could significantly drop to 316.2 ℃ at high-temperature thermal decomposition,reduced by 124.3 ℃,in comparison to that of pure AP with 440.5 ℃.It illustrated that the introduction of Al@Ni-P-Cu could weaken or even eliminate the obstacle of AP pyrolysis due to its reduction of activation energy with 118.28 kJ/mol.The laser ignition results showed that the ignition delay time of Al@Ni-P-Cu/AP mixture with 78 ms in air is shorter than that of Al@Ni-P/AP(118 ms),decreased by 33.90％.Those astonishing breakthroughs were attributed to the synergistic effects of adequate active sites on amorphous surface and oxidation exothermic reactions(7597.7 J/g)of Al@Ni-P-Cu,resulting in accelerated mass and/or heat transfer rate to catalyze AP py-rolysis and combustion.Moreover,it is believed to provide an alternative Al-based combustion catalyst for propellant designer,to promote the development the propellants toward a higher energy.

Micro-aluminum powder(μAl)Nano-sized alloy coatingCombustion catalystAmmonium perchloratePyrolysis behaviorlgnition and combustion

Chao Wang、Ying Liu、Mingze Wu、Jia Li、Ying Feng、Xianjin Ning、Hong Li、Ningfei Wang、Baolu Shi

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School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China

School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China

State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China

National Natural Science Foundation of China,ChinaNational Natural Science Foundation of China,ChinaNational Natural Science Foundation of China,China

U20B2018U21B208611972087

2024

10.1016/j.dt.2023.06.001

防务技术
中国兵工学会

防务技术

CSTPCD
影响因子：0.358
ISSN：2214-9147
年,卷(期)：2024.33(3)
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