Bimetal Al–Ni nano-powders for energetic formulations

Ani Abraham, Hongqi Nie, Mirko Schoenitz, Alexander B. Vorozhtsov, Marat Lerner, Alexander Vasilievich Pervikov, Nikolay Rodkevich, Edward L. Dreizin

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Four bimetal Al–Ni nano-powders with compositions varied from 5 to 45 at% of nickel were synthesized by explosion of electrically heated twisted pure Al and Ni wires in argon. The nano-powders were characterized using electron microscopy, x-ray diffraction, and thermal analysis. Materials were ignited using an electrically heated filament coated with powder and electrostatic discharge (ESD). The results were compared to those for pure nano-aluminum powder (n-Al) prepared using the same wire explosion technique. The nano-powders with high nickel concentrations contain fully reacted intermetallic phases, which are difficult to oxidize making them unattractive for energetic formulations. Nano-powders with lower nickel concentrations do not contain significant amounts of the intermetallic phases. No intermetallics were detected in the powder with 5 at% Ni, which oxidized qualitatively similar to n-Al. The overall mass gain during oxidation for the bimetal powder was nearly identical to that of n-Al, suggesting the same heat release anticipated from their combustion. Oxidation kinetics assessed for this material accounting directly for the measured particle size distribution was compared to that of n-Al. The bimetal powder oxidized slower than n-Al, indicating its greater stability during handling and storage. The bimetal powder was less ESD-ignition sensitive than n-Al, but generated a stronger emission signal when ignited. Therefore, the bimetal powder with 5 at% Ni is an attractive replacement of n-Al for advanced energetics with lower ESD sensitivity, better stability, and improved combustion performance.

Original languageEnglish
Pages (from-to)179-186
Number of pages8
JournalCombustion and Flame
Volume173
DOIs
Publication statusPublished - 1 Nov 2016

Keywords

  • Aluminum ignition
  • Combustion temperature
  • Electro-static discharge
  • Nano-aluminum aging
  • Nano-aluminum sensitivity
  • Thermal analysis

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Bimetal Al–Ni nano-powders for energetic formulations'. Together they form a unique fingerprint.

  • Cite this

    Abraham, A., Nie, H., Schoenitz, M., Vorozhtsov, A. B., Lerner, M., Pervikov, A. V., Rodkevich, N., & Dreizin, E. L. (2016). Bimetal Al–Ni nano-powders for energetic formulations. Combustion and Flame, 173, 179-186. https://doi.org/10.1016/j.combustflame.2016.08.015