"Effect of morphology of boron-potassium nitrate composite powders on t" by Purvam Mehulkumar Gandhi, Jonathan McNanna et al.
 

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

This document is currently not available here.

Share

COinS