Effect of coated and agglomerated boron on combustion characteristics of boron-based fuel-rich propellants

The effects of various factors,such as the content of the agglomerated boron,the types and contents of coating materials on the combustion characteristics of the boron-based fuel-rich propellants were experimentally investigated.The results show that propellants with agglomerated boron give higher burning rate and pressure exponent.Propellant with low AP coating gives higher burning rate at low pressure and poorer pressure exponent.High AP coating gives higher pressure exponent and poorer burning rate at low pressure.Coating of LiF can improve the burning rate of boron-based propellant at low pressure.While higher LiF coating has negative effect on pressure exponent.