Calculated Carbon Aromaticity Index: Difference between revisions

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A '''pyrolant''' (from Greek ''pyros'', fire) is an energetic material that generates hot [[flames]] upon [[combustion]]. Pyrolants are metal-based [[pyrotechnic composition]]s containing virtually any oxidizer.
The term was originally coined by Kuwahara in 1992,<ref>T. Kuwahara, T. Ochiachi, Burning Rate of Mg/TF Pyrolants, ''Proceedings of the 18th Int. Pyrotechnics Seminar'', '''1992''', p. 539.</ref> in a paper on [[magnesium/Teflon/Viton]], to distinguish between compositions that serve as propellants and those yielding hot flames which are not necessarily suitable for propellant purposes. 
 
The word ''[[thermite]]'' also refers to metal-oxidizer mixtures, and is used interchangeably with, and more commonly than, "pyrolant".
 
A similar common term is ''[[propellant]]'', which describes either a homogeneous or composite material that generates thrust upon combustion, but which may contain fuels instead of or in addition to the metals contained in [[thermite]]s.
 
Metal-based pyrotechnic compositions, that is to say [[thermite]]s or pyrolants, are generally characterized by high combustion temperatures (> 2000 K) and high amounts of condensed reaction products at equilibrium conditions such as metal [[oxide]]s, [[fluoride]]s and [[soot]].
Typical pyrolants find use as [[pyrotechnic initiator]]s ([[zirconium|Zr]]/[[barium chromate|BaCrO<sub>4</sub>]])<ref>[http://www3.interscience.wiley.com/cgi-bin/abstract/107630230/ABSTRACT] T. Kuwahara, T. Kohno, C. H. Wang, Static Electric Sensitivity Characteristics of Zr/<math> BaCrO_\mathrm{4}</math>, Pyrolants, ''Prop., Explos., Pyrotech. 29'' '''2004''', 56.
</ref> or Zr/[[potassium perchlorate|KClO<sub>4</sub>]],  [[flare|illuminating flare]] ([[magnesium|Mg]]/[[sodium nitrate|NaNO<sub>3</sub>]])<ref>[http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V2B-497SFT6-RS&_user=10&_handle=C-WA-A-BD-BD-MsSWYVW-UUW-U-U-BD-U-U-AADUUDCCDA-AAZDZCZBDA-AYWWUVDWU-BD-U&_fmt=summary&_coverDate=12%2F31%2F1983&_rdoc=13&_orig=browse&_srch=%23toc%235698%231983%23999489999%23445194!&_cdi=5698&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=33b12e7652e2cc50dd01faf32e7683af] J. R. Ward, L. J. Decker, A. W. Barrows, Burning Rates of Pressed Strands of a Stoichiometric Magnesium-Sodium Nitrate Mix, ''Combust. Flame 51'' '''1983''', 121.</ref> and [[flare (countermeasure)|decoy flare]] compositions (Mg/[[teflon|(C<sub>2</sub>F<sub>4</sub>)<sub>n</sub>]])<ref>[http://www3.interscience.wiley.com/cgi-bin/abstract/110531872/ABSTRACT] E.-C. Koch Metal/Fluorocarbon Pyrolants: VI. Combustion Behaviour and Radiation Properties of Magnesium/Poly(Carbon Monofluoride) Pyrolant, Prop''., Explos., Pyrotech. 30'' '''2005''' 209.</ref>
 
==References==
<references/>
 
[[Category:Military technology]]
[[Category:Pyrotechnic compositions]]

Revision as of 18:06, 29 December 2013

A pyrolant (from Greek pyros, fire) is an energetic material that generates hot flames upon combustion. Pyrolants are metal-based pyrotechnic compositions containing virtually any oxidizer. The term was originally coined by Kuwahara in 1992,[1] in a paper on magnesium/Teflon/Viton, to distinguish between compositions that serve as propellants and those yielding hot flames which are not necessarily suitable for propellant purposes.

The word thermite also refers to metal-oxidizer mixtures, and is used interchangeably with, and more commonly than, "pyrolant".

A similar common term is propellant, which describes either a homogeneous or composite material that generates thrust upon combustion, but which may contain fuels instead of or in addition to the metals contained in thermites.

Metal-based pyrotechnic compositions, that is to say thermites or pyrolants, are generally characterized by high combustion temperatures (> 2000 K) and high amounts of condensed reaction products at equilibrium conditions such as metal oxides, fluorides and soot. Typical pyrolants find use as pyrotechnic initiators (Zr/BaCrO4)[2] or Zr/KClO4, illuminating flare (Mg/NaNO3)[3] and decoy flare compositions (Mg/(C2F4)n)[4]

References

  1. ↑ T. Kuwahara, T. Ochiachi, Burning Rate of Mg/TF Pyrolants, Proceedings of the 18th Int. Pyrotechnics Seminar, 1992, p. 539.
  2. ↑ [1] T. Kuwahara, T. Kohno, C. H. Wang, Static Electric Sensitivity Characteristics of Zr/BaCrO4, Pyrolants, Prop., Explos., Pyrotech. 29 2004, 56.
  3. ↑ [2] J. R. Ward, L. J. Decker, A. W. Barrows, Burning Rates of Pressed Strands of a Stoichiometric Magnesium-Sodium Nitrate Mix, Combust. Flame 51 1983, 121.
  4. ↑ [3] E.-C. Koch Metal/Fluorocarbon Pyrolants: VI. Combustion Behaviour and Radiation Properties of Magnesium/Poly(Carbon Monofluoride) Pyrolant, Prop., Explos., Pyrotech. 30 2005 209.
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