Influence of boron content in boron-based pyrotechnic composition and particle size distribution of oxidiser, i.e., KNO, in Mg-based pyrotechnic composition is examined by subjecting these to various tests. Study on boron-based pyrotechnic compositions reveals that compositions with 20, 25 and 30 parts by weight of boron are promising igniter compositions wrt their calorimetric values, pressure maximum, ignition delay, etc. However, from sensitivity point of view, the composition with 30 parts of boron is more safe to handle, manufacture and use. From the study of particle size distribution of KNO, in Mg-based pyrotechnic compositions, it is observed that the composition with wider particle size distribution of oxidiser gives better packing density for their binary mix with metal fuel, which in turn gives lower ignition delay and ignition temperature.
A modified method for prediction of performance of large motors based on erosion constant obtained by partial burning technique is discussed. Erosion constants for two different double base compositions have been determined by partial burning technique. These constants have been used to predict the performance of the large scale motors developed for Defence applications. The predicted performance compares well with the experimental values.
The study reports the effect of incorporation of Al and ammonium perchlorate (AP) individually and in combinatipn with each other on combustion pattern and specific impulse (Isp) of minimum signature propellants. Incorporation of Al obviates the combustion instability problems; however, it has marginal, effect on burning rates. The composition containing AP and zirconium silicate combination gives superior performance; however, its Isp is considerably lower than the composition incorporating 9 per cent AP. A combination of 6 per cent AP and 3 per cent Al gave 20 per cent enhancement in burning rate. and 12 s increase in Isp as compared to purely nitramine-based composition, cal-val results also reveal increase in energy output on incorporating AP and Al. Hot stage microscopic and propellant combustion studies indicate occurrence of intense decomposition reaction in case of AP-based compositions. To get useful information on these aspects and to provide supporting evidence for various prevailing theories3-8, nitramine-based double-base (DB) compositions with varying quantities of AP and AI were prepared and evaluated. A unique feature of this study was determination of ballistics including Isp by statically evaluating the grains in a small rocket motor while other researchers have reported strand and burner results and theoretical/sp for nitramine and AP based CMDB9. I.
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