MODERN AlB12/KNO3-BASED PYROTECHNIC SYSTEM: COMBUSTION CHARACTERISTICS AND PERFORMANCE STUDY FOR THE IGNITER APPLICATION

In this study, aluminum dodecaboride (AlB12)- and potassium nitrate (KNO3)-based igniter compositions were prepared in different fuel-to-oxidizer ratios to study pyrotechnic performance and other characteristics. The prepared pyrotechnic systems have been characterized for surface morphology, ballistic properties (maximum pressure (P-max), ignition delay and burning time to reach P-max (BTPmax), burning rate, and exothermicity, as well as for impact and friction sensitivities. The composition having AlB12/KNO3 (25/75) displayed highest exothermicity (1790 cal/g) with lowest ignition delay (25 ms) and BTPmax (32 ms). The same composition exhibited highest impact sensitivity (height of 50% explosion: 53 cm), though within permissible limits. The experimental results indicate increased burning rate with the increase of AlB12 content. All the compositions were found to be insensitive to friction up to a load of 36 kg and thus are safe for processing and handling. Results indicate that the AlB12-based composition can be used for future igniter compositions.