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Title: Desensitizing ignition of energetic materials when exposed to accidental fire

Abstract

Composite energetic materials combine fuel and oxidizers for high energy density exothermic reactions and are used for ordnance, industrial and localized power generation applications. This study focuses on examining an additive to a mixture of aluminum (Al) and copper oxide (CuO) to decrease ignition sensitivity under accidental fire exposure conditions. Ammonium nitrate (AN) was incorporated into Al+CuO, as a 1:1 replacement for CuO, for varied equivalence ratios and examined for ignition and combustion when exposed to slow and fast heating rate ignition conditions. The goal was to develop an Al+CuO+AN formulation that would perform comparable to Al+CuO when intentionally ignited, but would not ignite in an accidental fire. Experimental results show that Al+CuO+AN with an equivalence ratio (ER) ranging from 4.0–5.5 inerts the reactants when exposed to slow heating conditions, yet ignites with comparative combustion performance to the baseline Al+CuO mixture when exposed to fast heating conditions. These results are consistent with thermochemical simulations of the heat of combustion and adiabatic flame temperature for the respective reactions. In conclusion, this study presents a new approach for tailoring composite energetic materials toward accidental fire safety by exploiting the early stage decomposition kinetics of AN, which are activated only by slow heatingmore » ignition conditions.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [2];  [2]
  1. Texas Tech Univ., Lubbock, TX (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1470329
Report Number(s):
INL/JOU-16-40271-Rev000
Journal ID: ISSN 0379-7112
Grant/Contract Number:  
AC07-05ID14517
Resource Type:
Accepted Manuscript
Journal Name:
Fire Safety Journal
Additional Journal Information:
Journal Volume: 76; Journal Issue: C; Journal ID: ISSN 0379-7112
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; fire; energetic materials; ignition; thermites; desensitization; safety; aluminum; ammonium nitrate; ignition sensitivity; combustion

Citation Formats

Poper, Kade, Clark, Billy R., Pantoya, Michelle L., Heaps, Ronald J., and Daniels, Michael A.. Desensitizing ignition of energetic materials when exposed to accidental fire. United States: N. p., 2015. Web. doi:10.1016/j.firesaf.2015.06.003.
Poper, Kade, Clark, Billy R., Pantoya, Michelle L., Heaps, Ronald J., & Daniels, Michael A.. Desensitizing ignition of energetic materials when exposed to accidental fire. United States. doi:10.1016/j.firesaf.2015.06.003.
Poper, Kade, Clark, Billy R., Pantoya, Michelle L., Heaps, Ronald J., and Daniels, Michael A.. Fri . "Desensitizing ignition of energetic materials when exposed to accidental fire". United States. doi:10.1016/j.firesaf.2015.06.003. https://www.osti.gov/servlets/purl/1470329.
@article{osti_1470329,
title = {Desensitizing ignition of energetic materials when exposed to accidental fire},
author = {Poper, Kade and Clark, Billy R. and Pantoya, Michelle L. and Heaps, Ronald J. and Daniels, Michael A.},
abstractNote = {Composite energetic materials combine fuel and oxidizers for high energy density exothermic reactions and are used for ordnance, industrial and localized power generation applications. This study focuses on examining an additive to a mixture of aluminum (Al) and copper oxide (CuO) to decrease ignition sensitivity under accidental fire exposure conditions. Ammonium nitrate (AN) was incorporated into Al+CuO, as a 1:1 replacement for CuO, for varied equivalence ratios and examined for ignition and combustion when exposed to slow and fast heating rate ignition conditions. The goal was to develop an Al+CuO+AN formulation that would perform comparable to Al+CuO when intentionally ignited, but would not ignite in an accidental fire. Experimental results show that Al+CuO+AN with an equivalence ratio (ER) ranging from 4.0–5.5 inerts the reactants when exposed to slow heating conditions, yet ignites with comparative combustion performance to the baseline Al+CuO mixture when exposed to fast heating conditions. These results are consistent with thermochemical simulations of the heat of combustion and adiabatic flame temperature for the respective reactions. In conclusion, this study presents a new approach for tailoring composite energetic materials toward accidental fire safety by exploiting the early stage decomposition kinetics of AN, which are activated only by slow heating ignition conditions.},
doi = {10.1016/j.firesaf.2015.06.003},
journal = {Fire Safety Journal},
number = C,
volume = 76,
place = {United States},
year = {2015},
month = {6}
}

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