EFFECT OF IRON AND BORON POWDERS ON IGNITION AND COMBUSTION OF ALUMINIZED COMPOSITE SOLID PROPELLANTS

摘要

The effect of ultrafine powders (UFPs) of iron and amorphous boron in the composite solid propellants (CSPs) on the basis of ammonium perchlorate (AP), butadiene rubber and aluminum UFP Alex on the characteristics of ignition and combustion, also on the composition of condensed combustion products (CCPs) was studied. It was found that partial replacement Alex by iron UFP in CSP decreases the ignition time 1.3-1.9 times under initiation by CO_2-laser in the air at the range of heat flux density 55-220 W/cm~2 and the increase of the recoil force of gasification products outflow from burning surface by 27 % in the period of stationary combustion of samples and the increase of the burning rate 1.3-1.4 times at the range of nitrogen pressure 2.0-7.5 MPa and reduction of the average diameter of particles d_(43) of CCPs from 37.4 μm to 33.5 μm at nitrogen pressure ～4 MPa. Upon partial replacement of Alex by amorphous boron UFP in CSP the ignition times are decreased 1.2-1.4 times, the recoil force of gasification products outflow from burning surface is increased by 9 % and the burning rate of CSP does not change in the above pressure range, while the average diameter of particles d_(43) of CCPs is reduced to 32.6 μm.