Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.1000
pages 985-993

DEVELOPMENT OF PASSIVATED PYROPHORIC METAL POWDERS (HAFNIUM AND ZIRCONIUM) WITH REDUCED ELECTROSTATIC DISCHARGE (ESD) SENSITIVITY

W. Douglas Bates
MACH I, Inc., King of Prussia, PA 19406, USA
Carl Gotzmer
NAVSEA-lndian Head Division, USA

RÉSUMÉ

High density metals such as hafnium and zirconium are of interest to the propellant, explosive, and pyrotechnic industry due to their high oxidation enthalpies; however, these metal fuels suffer from electrostatic discharge (ESD) complications creating safety concerns. Previous attempts to passivate these powders have failed due to abrasion of the protective coatings. Two novel methods for desensitizing hafnium powder based on technology developed by MACH I, Inc. were successfully demonstrated in a Phase I SBIR project: both approaches negate abrasion complications. First, Reactive-Milling (RM) of hafnium powder with NH4OH to 800 °C in a N2 atmosphere produces a thin protective coating of HfN on hafnium. The olive-gold material exhibited elevated ESD thresholds. The second method, RM of hafnium and aluminum powders in an Ar atmosphere to 700 °C followed by nitridation at 610 °C, generated a protective intermetallic coating (Al2Hf) on hafnium, which also exhibited excellent passivation levels. All reactions studied were carried out at atmospheric pressures. These materials were fully characterized by optical, SEM, and XRD analyses.


Articles with similar content:

PLASMA SYNTHESIS OF ULTRAFINE SIC/TIC-COMPOSITE POWDERS
Progress in Plasma Processing of Materials, 1997, Vol.1, 1997, issue
R. Mach, H.-D. Klotz, F. Oleszak, I. Dorfel , H. Drost, E. Schierhorn
LOW TEMPERATURE PLASMA ENHANCED CHEMICAL VAPOR DEPOSITION OF CARBON FILMS ON DIFFERENT SUBSTRATES
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.10, 2006, issue 3
A. B Ustinov, A. S. Smirnov, A. Ya. Vinogradov, A. N. Andronov, K. E. Orlov
VITREOUS SILICA LAYERS SYNTHESIZED BY AN INDUCTIVELY COUPLED PLASMA TORCH (ICPT) WORKING AT ATMOSPHERIC PRESSURE: DEPOSITION AND CHARACTERIZATION
Progress in Plasma Processing of Materials, 1999, Vol.1, 1999, issue
P. Cocito, Cristina Panciatichi, M.C.N. De Leo
IGNITER COMPOSITIONS FOR LOVA AND DOUBLE-BASE PROPELLANTS CONTAINING KDN
International Journal of Energetic Materials and Chemical Propulsion, Vol.18, 2019, issue 2
E. Roth, Stefan Kelzenberg, Sebastian Knapp, Volker Weiser, A. Koleczko
INFLUENCE OF DC PLASMA PREHEATING ON OXIDE LAYERS FORMED BY FURNACE HEATING ON LOW CARBON STEEL SUBSTRATES AND RESULTING ADHESION/COHESION OF ALUMINA COATINGS
Progress in Plasma Processing of Materials, 2003, Vol.0, 2003, issue
Pierre Lefort, S. Valette, Alain Denoirjean, Pierre Fauchais