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.
Studies on polymethyl methacrylate (PMMA) as a binder for igniter and delay compositions &re reported. Igniter compositions based on magnesium and boron as fuels and potassium nitrate as oxidiser, and delay compositi,ons comprising ferrosilicon and red lead, have been investigated. These compositions were subjected to various tests, such as linear burning rate, sensitivity, calorimetric value, compatibility, pelleting properties, spark sensitivity, ignition temperatures and performance characteristics. The results indicate that the igniter compositions Mg:KNO3:PMMA (42:50:8) and B:KNO3:PMMA (30:70:10) as well as the delay composition comprising FeSi:Pb3O4:PMMA (25:75:1) have improved properties and therefore could find practical applications.
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