Kinetics and thermochemistry of the boron-fuelled pyrotechnic compositions BLC 190 and BLC 181 at their ignition temperatures |
| |
| Authors: | Daniel J Whelan Michael Maksacheff Branka Pletikapa Leo V de Yong |
| |
| Affiliation: | Physical Chemistry Division, Materials Research Laboratories , PO Box 50, Ascot Vale, Victoria, Australia , 3032 |
| |
| Abstract: | Around 700 K, the pyrotechnic compositions BLC 190 (boron : red lead, 10 : 90) and BLC 181 (boron : red lead : chromic oxide, 10 : 80 : 10) undergo exothermic thermal decomposition reactions which follow first order kinetics. The reaction of BLC 190 is faster than that of BLC 181 but the energies of activation, ca. 446 kJ mol?1, and the heat output per unit mass of oxidant, Pb304’ ca. 1000 J g?1, are very similar suggesting that the reactions of each of these formulations follow identical pathways. The product of the reaction from BLC 190 has been identified as lead tetraborate or a closely related compound. |
| |
| Keywords: | |
|
|
