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International Journal of Energetic Materials and Chemical Propulsion

Выходит 6 номеров в год

ISSN Печать: 2150-766X

ISSN Онлайн: 2150-7678

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 0.7 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00016 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.18 SJR: 0.313 SNIP: 0.6 CiteScore™:: 1.6 H-Index: 16

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

Том 5, Выпуск 1-6, 2002, pp. 985-993
DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.1000
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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.

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