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: 0.28 SNIP: 0.421 CiteScore™: 0.9

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:

NOZZLE EROSION CHARACTERIZATION IN A NON-METALLIZED SOLID-PROPELLANT ROCKET MOTOR SIMULATOR
International Journal of Energetic Materials and Chemical Propulsion, Vol.7, 2008, issue 3
Jeffrey D. Moore, Brian Evans, Patrick Kutzler, Eric Boyd, Peter J. Ferrara
PLASMA SPRAYING OF A PEROVSKITE SUSPENSION FOR SOFC CATHODES
Progress in Plasma Processing of Materials, 2003, Vol.0, 2003, issue
C. Monterrubio Badillo, T. Chartier, J. F. Coudert, Helene Ageorges, Pierre Fauchais
THERMAL EXPLOSION SYNTHESIS OF TITANIUM HYDRIDE POWDERS
International Journal of Energetic Materials and Chemical Propulsion, Vol.12, 2013, issue 4
Alon Gany, Valery Rosenband
A FLEXIBLE LOW PRESSURE PLASMA PROCESS FOR THE DEPOSITION OF COMPLEX THICK OXIDE COATINGS
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.13, 2009, issue 3-4
Daniel Morvan, F. Rousseau, S. Awamat
OXIDATION AND DECOMPOSITION OF N2O BY GLIDING DISCHARGE COMBINED WITH A BED OF CATALYST
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.5, 2001, issue 3
Michal Mlotek, Krzysztof Krawczyk, Krzysztof Schmidt-Szalowski