Tuning the reactivity of Al-Ni by fine coating of halogen-containing energetic composites  

作　　者：Su-lan Yang Ke-juan Meng Wu-xi Xie Hong-qi Nie Qi-Long Yan 

机构地区：[1]Science and Technology on Combustion,Internal Flow and Thermo-Structure Laboratory,Northwestern Polytechnical University,Xi'an,710072,China [2]b Xi'an Modern Chemistry Research Institute,Xi'an,710065,China

出　　处：《Defence Technology（防务技术）》2022年第10期1810-1821,共12页Defence Technology

基　　金：supported by the Nation Natural Science Foundation of China(Grant No.51776176);the Fundamental Research Funds for the Central Universities,China(Grant No.G2017KY0301);partially funded by NSAF project(Grant No.2030202);sponsored by Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(Grant No.CX2021048)。

摘　　要：In this paper,various core-shell structured Al—Ni@ECs composites have been prepared by a spray-drying technique.The involved ECs refer to the energetic composites(ECs)of ammonium perchlorate/nitrocellulose(AP/NC,NA)and polyvinylidene fluoride/hexanitrohexaazaisowurtzitane(PVDF/CL-20,PC).Two Al—Ni mixtures were prepared at atomic ratios of 1:1 and 1:3 and named as Al/Ni and Al/3Ni,respectively.The thermal reactivity and combustion behaviors of Al—Ni@ECs composites have been comprehensively investigated.Results showed that the reactivity and combustion performance of Al—Ni could be enhanced by introducing both NA and PC energetic composites.Among which the Al/Ni@NA composite exhibited higher reactivity and improved combustion performance.The measured flame propagation rate(v=20.6 mm/s),average combustion wave temperature(T_(max)=1567.0°C)and maximum temperature rise rate(γ_(t)=1633.6°C/s)of Al/Ni@NA are higher than that of the Al/Ni(v=15.8 mm/s,T_(max)=858.0°C,andγ_(t)=143.5°C/s).The enhancement in combustion properties could be due to presence of the acidic gaseous products from ECs,which could etch the Al_(2)O_(3)shell on the surface of Al particles,and make the inner active Al to be easier transported,so that an intimate and faster intermetallic reaction between Al and Ni would be realized.Furthermore,the morphologies and chemical compositions of the condensed combustion products(CCPs)of Al—Ni@ECs composites were found to be different depending on the types of ECs.The compositions of CCPs are dominated with the Al—Ni intermetallics,combining with a trace amount of Al_(5)O_(6)N and Al_(2)O_(3).

关 键 词：Arrested high energy ball milling Intermetallic alloy Combustion performance Energetic composites Reactivity control 

分 类 号：TJ04[兵器科学与技术—兵器发射理论与技术] TQ560.1[化学工程—炸药化工]