The Kinetics and Thermochemistry of the Pyrotechnic Composition BLC-190 - Boron:Red Lead Oxide (10:90) at Its Ignition Temperature.

Abstract

The thermal decomposition of the important pyrotechnic composition BLC 190 (boron:red lead, 10:90) has been studied by isothermal and nonisothermal differential scanning calorimetry (aluminium sample pans, nitrogen atmosphere). The decomposition has been found to proceed at temperatures around 700 K through a first-order reaction obeying a simple Arrhenius law with an activation energy 434 kj/per mole, pre-exponential log10A/(pers) = 29.7 and heat of reaction 846 J/per g. No change in weight was observed in the reaction mixture, before and after heating and the end-product is a lead borate salt, Lead diborate or lead tetraborate rather than boric oxide. The reaction pathway appears to have a kinetic step similar to that of BPBO (boron: PbO, 10:90). Keywords: Pyrotechnics, Lead compounds, Boron compounds.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1986
Accession Number
ADA178561

Entities

People

  • D. J. Whelan
  • L. De Yong
  • M. Maksacheff

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Calorimetry
  • Chemical Compounds
  • Chemical Reaction Properties
  • Chemical Reactions
  • Chemistry
  • Decomposition
  • Energy
  • Heat Of Activation
  • Heat Of Reaction
  • Law
  • Lead Oxides
  • Materials
  • Oxides
  • Particle Size
  • Physical Chemistry
  • Spectra
  • Thermochemistry

Fields of Study

  • Chemistry

Readers

  • Materials Science and Engineering.
  • Rocket Propulsion.