Combustion characteristic and aging behavior of bimetal thermite powders  

作　　者：Hong-qi Nie Hay Yee Chan Sreekumar Pisharath Huey Hoon Hng 

机构地区：[1]Energetics Research Institute,Nanyang Technological University,Singapore

出　　处：《Defence Technology（防务技术）》2021年第3期755-762,共8页Defence Technology

摘　　要：Nanothermites have been employed as fuel additives in energetic formulations due to their higher energy density over CHNO energetics. Nevertheless, sintering and degradation of nanoparticles significantly limit the practical use of nanothermites. In this work, combustion characteristic and aging behavior of aluminum/iron oxide(Al/Fe2O3) nanothermite mixtures were investigated in the presence of micron-scale nickel aimed to produce bimetal thermite powders. The results showed that the alumina content in the combustion residue increased from 88.3% for Al/Fe2O3 nanothermite to 96.5% for the nanothermite mixture containing 20 wt% nickel. Finer particle sizes of combustion residue were obtained for the nanothermite mixtures containing nickel, indicative of the reduced agglomeration. Both results suggested a more complete combustion in the bimetal thermite powders. Aging behavior of the nanothermite mixture was also assessed by measuring the heat of combustion of the mixture before and after aging process. The reduction in heat of combustion of nanothermite mixtures containing nickel was less severe as compared to a significant decrease for the nanothermite mixture without nickel, indicating better aging resistance of the bimetal thermite powders.

关 键 词：Nanothermite BIMETAL Combustion efficiency AGING Thermochemical calculations 

分 类 号：TQ560.1[化学工程—炸药化工]