CASE GUN PROPELLANT IGNITION
NAVAL ORDNANCE LAB WHITE OAK MD
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Previous studies at the Naval Ordnance Laboratory indicated that pyrotechnic mixtures having high heats of reaction and yielding high percentages of solids on ignition are more effective than black powder in igniting propellants. Ignition effectiveness is based on the minimum quantities of the various compositions required to ignite the propellants. This report covers closed bomb studies of the ignition of pyro Cordite-N and two cool picrite 1950 deg K propellants. Test results show that the relative ease of ignition of the different types of propellants varies with the composition of the ignition mixture and may even be reversed by using different mixtures. Experimental compositions containing boron-potassium perchlorate, magnesium- potassium perchlorate, zicronium-potassium perchlorate, zirconium-potassium perchlorate-lead dioxide, proved to be superior to black powder in igniting the four propellants tested. In addition to the ignition studies, the mixtures were investigated to further determine their suitability for use in gun primers. Although the mixtures are more sensitive than black powder to impact, it is believed that the mixtures except two were found compatible with brass and steel. None of the mixtures ignited when subjected to temperatures of the order of 415 deg C for period of two minutes. It is concluded that many of the mixtures studied show considerable promise as substitutes for black powder in gun primers.
- Combustion and Ignition