By Kenneth L. Kosanke, B. J. Kosanke, Clive Jennings-White
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Extra info for Lecture Notes for Pyrotechnic Chemistry (Pyrotechnic Reference)
12 *v? 0 Potassium Dichromate (Percent) Adding 4% potassium dichromate doubled burn rate.
Easily ignited (Ea is low). • Generates abundant thermal energy (AHr is high). • Not overly sensitive to accidental ignition (Ea is not too low). AHr = Heat of reaction, the amount of energy produced by a tiny sample of pyrotechnic composition. Ef Activation Energy Heat of Reaction = Energy feedbackJ the amount of energy produced by a pyrotechnic composition that is fed back to the unburned composition. Thus Ef = AHr • Ffb, where Ffb is the fraction of energy fed back. A Graph Reaction Progress E Efficient energy feedback) for example: a Ef Sketch = Thermally conductive, = Dark colored (black), or Present Burning Surface Initial Burning Surface = Generates molten slag.
Page-3 - 19 ©Journal oFPyrolechnics 2004 Page-3 - 20 ©Journal of Pyrotechnics 2004 I Page-3 - 19 Page - 3 - 20 ©Journal of Pyrotechnics 2004 PRIME "SKIN" EFFECT PRIME APPLICATION TECHNIQUES Dusting: Sprinkle prime on surface of wet (damp) composition, frequently used on cut stars. ) ©Journal of Pyrotechnics 2004 Problem: If primes are applied when too wet, a skin of "non-flammable" binder can form, rendering the prime almost fire proof. Mechanism of skin formation: Layering: Slurry: Coat a heavy layer of prime on the surface of rolled (round) stars at completion of star making.
Lecture Notes for Pyrotechnic Chemistry (Pyrotechnic Reference) by Kenneth L. Kosanke, B. J. Kosanke, Clive Jennings-White