The Technology Of Aggregated Boron And Its Application In The Fuel-rich Solid Propellant

It has been found that the content of boron and the burning rate of propellant can be increased dramatically by coating and aggregated boron. The thesis presents the studies on the coating and aggregated process of boron particles and its effects on the craft , combustion rate of propellants;Also the viscosity of coating and aggregated boron particles to propellants was analyzed;Finally the combustion rate properties and combustion draff composition of coating and aggregated boron-based propellant were analyzed in order to compare the combustion efficiency of boron.Based the experimentations, we have made the good craftwork performance boron-based propellant which contained 34% boron, 15 % supper oxidant (1μm). Its combustion rate is 4.6mm/s in the air.The researching results of this paper can he concluded that:1) The influence of coating materials to boron-based fuel-rich propellants by Ap coating agent was analyzed. The result shows that coating boron can be reduced the viscosity of boron-based propellant greatly. Also by changing the different contents of AP and different diameter particles of boron to made aggregated boron in order to analyzed the viscosity of propellant. The resul shows that the viscosity of propellant is lower by the content of 15% AP in the condition of same diameter particles.2) The types of bond and aggregate craftworks are modified to the aggregation process. Aggregated-boron with good spherality and appropriate granularity series could be produced in centrifugal making-granule technique. By changing the different bonds and different diameter of particles to analyzed the viscosity of propellant. The result shows that the viscosity of propellant is lower by the bond of HTPB in the condition of same diameter particles.3) The burning rate of boron-based fuel-rich propellant has been measured by the method of butt line and the effectiveness of each component to the combustion rate performance has been analyzed in detail. Including the influence of composition to the boron-based propellants by changing the particle-size of AP, the amount of Mg/Al alloy and the diameter of aggregated-boron. The result shows that the combustion rate can be increased greatly with theincreasing of the supper powder.4) The combustion efficiency has been increased by analyzed the combustion draff of coating and aggregated boron-based propellants. The B, B2O3 and BN content in the combustion draff of coating boron-based propellants has been changed from 37.54:1:3.97 to 3.11:1:0.09;The B, B2O3 and BN content in the combustion draff of 28% aggregated boron-based propellants has been changed to 2.405:1:0.024.