Abstract
Boron-potassium nitrate (B-KNO3)-based compositions have been used as an effective igniter system for solid rocket propellants. A systematic study was undertaken to generate exhaustive data on B-KNO3 (25:65)-based ignition systems with cellulosic binders, viz., nitrocellulose, ethyl cellulose and plasticised ethyl cellulose. In addition, detailed investigations were carried out with PEC as binder by varying its concentration from 2-10 per cent in the same system. The experimental compositions (B-KNO3: binder) were evaluated by closed-vessel firing, thermal analysis, sensitivity, mechanical properties and cal-val determination. The binders significantly influenced the sensitivity and combustion behaviour of B-KNO3 compositions. The composition with nitrocellulose as binder produced high flame temperature and cal-val as compared to ethyl cellulose and plasticised ethyl cellulose-based compositions. The data indicated that the calculated flame temperature for all compositions was in the range 2716 K to 2957 K. As the plasticised ethyl cellulose content increased from 2 per cent to 10 per cent, the maximum pressure increased with decrease in heat of combustion.
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