Stability and Ignition of a Siloxane-Coated Magnesium Powder

Document Type

Article

Publication Date

4-1-2020

Abstract

Magnesium powders are used widely in reactive and energetic composite materials, such as pyrotechnic formulations, solid fuels and explosives, as a vital ignition source. However, magnesium powders are highly reactive with atmospheric oxygen and moisture, forming the inert magnesium oxide and hydroxide. These reactions limit their shelf life, decrease their potency and affects the overall stability of these materials. In order to increase their long-term stability, protective magnesium coatings are desired. In this work, a method for coating magnesium powders using tetramethylcyclotetrasiloxane (D4 H) through a vapor-solid interface reaction is described. This reaction requires no solvents, little material, and does not produce any corrosive byproducts. Coated powders demonstrate increased stability when exposed to elevated temperatures and high humidity conditions, with no oxidation of the magnesium observable. Despite improved stability, the coatings do not negatively impact ignition temperature and dynamics for magnesium powders.

Identifier

85073947608 (Scopus)

Publication Title

Propellants Explosives Pyrotechnics

External Full Text Location

https://doi.org/10.1002/prep.201900272

e-ISSN

15214087

ISSN

07213115

First Page

621

Last Page

627

Issue

4

Volume

45

Grant

FA9550‐16‐1‐0266

Fund Ref

Air Force Office of Scientific Research

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