Effect of morphology of boron-potassium nitrate composite powders on their ignition and combustion
Document Type
Article
Publication Date
9-1-2023
Abstract
Composite powders of boron and potassium nitrate (PN) with spherical and irregular particle shapes are prepared by milling, respectively, with and without an emulsion as process control agent. Powders are characterized using electron microscopy, x-ray diffraction and custom ignition and combustion tests. The mixing between boron and PN is more homogeneous for the spherical powders. When coated on an electrically heated filament, spherical powders ignite at lower temperatures and have lower apparent activation energies for ignition. Spherical composite powders also exhibit shorter ignition delays and greater rates of pressure rise when laser-initiated in a closed vessel, while the total pressure rise is similar for both spherical and irregularly-shaped powders. Ignition delays of laser-heated powders increase with ambient air pressure suggesting that, in the present experiments, air does not participate in the reactions leading to ignition, but serves instead as a heat sink.
Identifier
85161034218 (Scopus)
Publication Title
Combustion and Flame
External Full Text Location
https://doi.org/10.1016/j.combustflame.2023.112882
e-ISSN
15562921
ISSN
00102180
Volume
255
Grant
N00014-19-1-2048
Fund Ref
Office of Naval Research
Recommended Citation
Gandhi, Purvam Mehulkumar; McNanna, Jonathan; Schoenitz, Mirko; and Dreizin, Edward L., "Effect of morphology of boron-potassium nitrate composite powders on their ignition and combustion" (2023). Faculty Publications. 1450.
https://digitalcommons.njit.edu/fac_pubs/1450