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Passivation of the surface of aluminum nanopowders by protective coatings of the different chemical origin
Authors:Young-Soon Kwon  Julia I Strokova
Institution:a Research Center for Machine Parts and Materials Processing, School of Materials and Metallurgical Engineering, University of Ulsan, San-29, Mugeo-2 Dong, Nam-Ku, Ulsan 680-749, Republic of Korea
b Chemical Technology Department, Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634050, Russia
Abstract:The results of investigation and analysis of electro-exploded aluminum nanopowders, whose surface were passivated with the following substances: liquids - nitrocellulose (NC), oleic acid (C17H33COOH) and stearic acid (C17H35COOH), suspended in kerosene and ethanol, fluoropolymer; solids - boron and nickel; gases - N2, CO2 and air (for a comparison) are discussed. The surface protection for the aluminum nanopowders by coatings of different chemical origins leads to the some advantages of the powders properties for an application in energetic systems, e.g. solid propellants and “green” propellants (Al-H2O). Aluminum nanopowders with a protected surface showed the increased stability to oxidation in air during the storage period and higher reactivity by heating. The TEM-visual diagram of the formation and stabilization of the coatings on the particles has been proposed on the basis of experimental results. The kinetics of the interaction of aluminum nanopowders with air has been discussed. The recommendations concerning an efficiency of the protective “non-Al2O3” layers on aluminum nanoparticles were proposed.
Keywords:ALEX  aluminum explosive (TM)  EEW  electrical explosion of wires  ANP  aluminum nanopowder  Ssp  area of the specific surface (m2/g)  as  mean-surface particle diameter (nm)  TEM  transmission electron microscopy  CAl  metal aluminum content (wt  %)  TG  thermogravimetry  DSC  differential scanning calorimetry  UDP  ultra dispersed powder  EDS  energy dispersive X-ray spectrometry  XRD  X-ray diffraction
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