Mitigating the negative catalytic effect of CuO by FAS-17 coated Al nanopowder:Isothermal ageing of Al/CuO nanothermite at 71°C and 60%relative humidity  

作　　者：Fuwei Li Qian Wang Jian Cheng Zehua Zhang Yuxuan Zhou Keer Ouyang Jianbing Xu Yinghua Ye Ruiqi Shen 

机构地区：[1]School of Chemistry and Chemical Engineering,Nanjing University of Science&Technology,Nanjing 210094,China [2]Micro-Nano Energetic Devices Key Laboratory,Ministry of Industry and Information Technology,Nanjing 210094,Jiangsu,China [3]Institute of Space Propulsion,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Defence Technology（防务技术）》2024年第4期156-167,共12页Defence Technology

基　　金：supported by the National Natural Science Foundation of China(Grant No.22275092)。

摘　　要：The safety and reliability of weapon systems would be significantly affected by changes in the performance of energetic materials due to ambient temperature and humidity.Nanothermites have promising applications due to their excellent reactivity.Therefore it becomes extremely important to understand their aging and failure process in the environment before using them.Here,the aging and failure process of Al/CuO in 71°C/60%RH were investigated,and showed that CuO nanoparticles negatively catalyze Al nanopowders,resulting in rapid hydration.The anti-aging effect of FAS-17-coated Al nanopowder was also examined.The aging process of Al,Al/CuO,and Al@FAS-17/CuO in high humidity and heat environment were revealed by quasi-in situ SEM and TEM methods.Compared with the aging of pure Al,the Al nanopowder in the nanothermites strongly agglomerated with the CuO nanopowder and hydrated earlier.This may be caused by CuO catalyzed hydration of Al nanopowder.The energy release experiments showed that the performance of Al/CuO decreased rapidly and failed to ignite after 4 h of aging.In contrast,the Al@FAS-17/CuO thermite can achieve long-term stability of up to 60 h in the same environment by simple cladding of FAS-17.It is found that FAS-17 coated Al nanopowder can prevent both particle agglomeration and water erosion,which is an effective means to make nanothermites application in high humidity and heat environment.

关 键 词：Al/CuO nanothermite FAS-17 coating Aging and failure process 

分 类 号：TQ560.1[化学工程—炸药化工]