Combustion characteristics of XLDB and NEPE propellants with catalyst

XLDB and NEPE propellants with catalysts were prepared. Their burning rates were measured by strand burner method. The results show that pressure exponent of XLDB propellant decreases by 27.1% when the contents of lead monosalicylate and copper monosalicylate are 1.5% and 0.5%, respectively. But when other lead salts and copper salts are added to XLDB propellant, the burning rate of XLDB propellant increases, and pressure exponent of XLDB propellant does not decrease. The burning rate and pressure exponent of XLDB propellant with lead monosalicylate and nickel molybdate, or thorium dioxide are higher than that of XLDB propellant with lead monosalicylate and copper monosalicylate. The pressure exponent of XLDB propellant does not decrease and the burning rate of XLDB propellant increases a little when nickel molybdate and other catalysts are added to XLDB propellant. With the increasing of contents of lead carbonate, the pressure exponent of NEPE propellant decreases. The pressure exponent of NEPE propellant decreases by 34.7% when the contents of lead carbonate and carbon black are 2% and 0.5%, respectively. The effect of catalysts of multiple components influencing burning rate and pressure exponent of NEPE propellant is same as catalyst of two components, for example lead carbonate and carbon black.