Passivation of Metal Nanopowders

Abstract

Results of investigation and chemical analysis of electro-exploded metal nanopowders passivated and/or coated with the non-inert reagents and air (for a comparison) are discussed. Surface protection of aluminum nanopowders by coatings of different origin results in significant advantages in the energetic properties of the powders. Aluminum nanopowders with a protecting surface show increased stability to oxidation in nitrogen, air and in water during storage period. On the basis of experimental results, diagram of the formation and stabilization of the coatings on particles has been proposed. Kinetics of interaction of aluminum nanopowders with nitrogen, air and water has been discussed. Recommendations concerning efficiency of non-inert reagent passivation are proposed on a basis of comprehensive analysis of the experimental data

The Resource-Saving Technology of Aluminum Nitride Obtaining During Combustion of Aluminum Nanopowder in Air

“…The aluminum nanopowder was obtained with the help of UDP-4G machine, developed in National Research Tomsk Polytechnic University [16]. The concept scheme of the machine for nanopowders production is shown in Fig.…”

Progress in Additive Manufacturing of Energetic Materials: Creating the Reactive Microstructures with High Potential of Applications

“…The most prominent result observed was the decrease in the ignition time and increase in the burning rate for compositions containing nano-Al [38,155,156]. However, the wide utilization of nanometals is limited by several factors, i. e., (i) the reduced metal content and associated performance losses [160] (note the surprising positive effect of the oxide layer [165]), (ii) stability issues, e. g., oxidation during storage [166], (iii) coalescence prior to reaction, diminishing the effects of nanosize [167,168], (iv) the gradual increase in viscosity for compositions with a binder [169], and (v) the difficulty of obtaining a uniform composite mixture with nanocomponents [156,170].…”

Monitoring of Aluminum Nanopowder Combustion Ignited by Laser Radiation

“…Particularly, aluminum-based materials offer a number of interesting and potentially high impact commercial opportunities [1][2][3][4][5]. Ceramic materials on AlN basis are among the most promising materials used as heat-removing dielectric substrates in microelectronics and optoelectronics [3].…”

“…A phenomenon of self-heating of aluminum nanoparticles and the resulting hydrogen is an interesting solution for pure hydrogen production. At the same time, AlN is an undesirable product in the combustion of solid propellants, thermites and explosives [1].…”