Combustion of Aluminum-Metal Fluoride Reactive Composites in Different Environments

Siva Kumar Valluri, Mirko Schoenitz, Edward Dreyzin

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Combustion of two nanocomposite powders comprising equal mass fractions of aluminum and a metal fluoride, BiF3 or CoF2, is characterized experimentally. The powders were prepared by arrested reactive milling; earlier work showed that they are readily ignited upon heating and are insensitive to ignition by electrostatic discharge. Here, powder particles were ignited in air by passing through a focused CO2 laser beam. They were also ignited and burned in oxygen-starved environments produced in the combustion products of an air-acetylene and air-hydrogen flames. Burn times and color temperatures of the particles were measured optically. Combustion products were collected and examined using electron microscopy. Correlations of burn times with particle sizes showed that the composites containing BiF3 burned faster than those containing CoF2. In air, the burn rates of both composite powders exceeded that of pure Al; in the oxygen-starved environments the burn rates of the prepared composites were comparable to that of Al. The flame temperatures of the CoF2-containing composite were limited by the Al boiling point while BiF3 containing composites burned at higher temperatures. Combustion mechanisms for the prepared materials are discussed qualitatively.

Original languageEnglish (US)
Pages (from-to)1327-1336
Number of pages10
JournalPropellants, Explosives, Pyrotechnics
Volume44
Issue number10
DOIs
StatePublished - Oct 1 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Keywords

  • energetic materials
  • metal combustion
  • metallized propellants.
  • reactive materials
  • thermites

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