Role of Silicon in Boron Potassium Nitrate System.

Abstract

To examide the possibility of improving the ignition characteristics lof the commonly used pyrotechnic ignition system based on B-KNO3-Binder (30:70: 10), B was gradually replaced Jjy Si in its composItion. The addition of Si was found to reduce the maximum pressure find increase the ignition delay. Max.imum dp/dr value was observed with the composition containing 5 per cent Si. The differentia' thermal analysis results showed single sharp peaks for ignition in the temperature range 500-570 ~C. 1ihe heat of combustion and burning rate decreased with increase in Si content. hnpact senSitivity of the compositions increased with increase in the percentage of Si, whereas no change was obse~ed in the friction sensitivity in comparison with the base composition.1 I.

Influence of Guanylurea Dinitramide (GUDN) on the Thermal Behaviour, Sensitivity and Ballistic Properties of the B-KNO3-PEC Ignition System

“…Propellant exothermic reactions rapidly become the dominant heat source and ignition of the propellant is achieved. The propulsive force of a solid rocket motor is derived from the controlled combustion of the solid propellant fuel at high temperature and pressure [1]. The function of the igniter is to initiate this combustion reaction in a restricted and predictable mode and at a specific rate.…”

“…Therefore, the selection of the igniter composition depends on the combustion behaviour and physicochemical characteristics of the propellant. Other characteristics to be considered are flame temperature, safety, sensitivity towards impact, friction and spark, shelf life, cost effectiveness and availability of raw materials [2]. Most modern high performance rockets use a boron-potassium nitrate pyrotechnic composition for the ignition of the solid rocket propellant.…”