| || Role of Silicon in Boron Potassium Nitrate System
Author : Sarawadekar, R.G. ;Sane, P.P.;Bhingarkar, V.S.
Source : Defence Science Journal ; Vol:47(3) ; 1997 ; pp 365-371
Subject : 623.4 Armaments and Ballistics;66 Chemical Technology
Keywords : Burning rate ;Pyrotechnic ignition system
Abstract : To examine the possibility of improving the ignition characteristics of the commonly used pyrotechnic ignition system based on B-KNO/sub 3/-Binder (30:70:10), B was gradually replaced by Si in its composition. The addition of Si was found to reduce the maximum pressure find increase the ignition delay. Maximum dp/dr value was observed with the composition containing 5 per cent Si. The differential thermal analysis results showed single sharp peaks for ignition in the temperature range 500-570 degreeC. The heat of combustion and burning rate decreased with increase in Si content. Impact sensitivity of the compositions increased with increase in the percentage of Si, whereas no change was observed in the friction sensitivity in comparison with the base composition.
| || Polymethyl Methacrylate as a Binder for Pyrotechnic Compositions
Author : Sane, P.P. ;Dugam, A.G.;Wagh, R.M.;Kakade, S.D.;Sontakke, S.P.
Source : Defence Science Journal ; Vol:45(4) ; 1995 ; pp 349-352
Subject : 66 Chemical Technology
Keywords : PMMA ;Linear burning rate;Polymethyl methacrylate
Abstract : Studies on polymethyl methacrylate (PMMA) as a binder for igniter and delay compositions are reported. Igniter compositions based on magnesium and boron as fuels and potassium nitrate as oxidiser, delay compositions 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:KNO/sub 3/:PMMA (42:50:8) and B:KNO/sub 3/:PMMA (30:70:10) as well as the delay composition comprising FeSi:Pb/sub 3/O/sub 4:PMMA (25:75:1) have improved properties and therefore could find practical applications.