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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN 印刷: 2150-766X
ISSN オンライン: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2012001364
pages 123-134

THERMAL REACTIVITY OF AL/FE CORE−SHELL NANOCOMPOSITES

Wei Jiang
National Special Superfine Powder Engineering Research Center, Nanjing University of Science & Technology, Nanjing, 210094, China
Fengsheng Li
National Special Superfine Powder Engineering Research Center, Nanjing University of Science & Technology, Nanjing, 210094, China
Yi Wang
School of Materials Science and Engineering, North University of China, Taiyuan 030051, People's Republic of China
Xiaode Guo
National Special Superfine Powder Engineering Research Center, Nanjing University of Science & Technology
Other research areas:Nanomaterials, Energetic Materials
Zhipeng Cheng
National Special Superfine Powder Engineering Research Center, Nanjing University of Science & Technology, Nanjing 210094, China
Xiaojuan Zhang
National Special Superfine Powder Engineering Research Center, Nanjing University of Science & Technology, Nanjing 210094, China
Shixi Wu
National Special Superfine Powder Engineering Research Center, Nanjing University of Science & Technology, Nanjing 210094, China

要約

To improve the thermal reactivity of aluminum micro-particles, Al/Fe nanocomposites with core-shell structure were prepared by a displacement method, in which Al micro-particles were coated by Fe nanoparticles. The reactivity of Al before and after coating was examined via thermal analysis. Moreover, to demonstrate the significant role of surface coating a mixture consisting of micro-Al and nano-Fe was also tested. Two oxidizers (O2 and CuO) were employed to react with the fuels. The parameters derived from thermogravimetric (TG), differential scanning calorimetric (DSC), and differential thermogravimetric (DTG) curves of each sample were compared. It was obvious that the reaction involving Al/Fe exhibited the highest integrated heat (in DSC), the highest weight increase (in TG), and the largest reaction rate (in DTG). Only Al/Fe-O2 and Al/Fe-CuO exhibited a distinct low-temperature reaction adjacent to the Al melting point, which may be significant in their ignition at high heating rates. Moreover, Al/Fe fueled systems manifested the lowest apparent activation energy comparing with systems using [Al+Fe] and raw Al as the fuels. All these results affirmed augmentation in thermal reactivity arising from surface coating with nano-Fe.


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