Passivation of the surface of aluminum nanopowders by protective coatings of the different chemical origin |
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Authors: | Young-Soon Kwon Julia I Strokova |
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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 |
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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. |
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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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