The Influence of Agglomerated Boron on Burning Rate of Fuel-rich Solid Propellant

The agglomerated boron,which has good roundness and particle size of 0.105～0.19mm,has been prepared through a dry process,and the fuel-rich propellant sample which contain 32% of agglomerated boron and with the heat value 32MJ/kg has been successfully prepared. The burning rate and pressure index of propellant samples,with different AP gradation and Mg/Al(particle size) combination and agglomerated boron with different particle size,has been determined by strand burner method.It is found that the processing of fuel-rich solid propellant become less difficult when the agglomerated boron is introduced for replacing ordinary boron powder.That would make it realized to increase the content of boron,fine AP and other solid ingredients in composition so as to improve the heat value and combustion characteristics of propellant mentioned above.Especially,increasing the content of fine AP in composition has led to the significant enhancement of burning rate and pressure index of propellant samples,but the effects of particle size of Mg/Al and agglomerated boron are rather minor.