Properties of NEPE Solid Propellant Containing Hexanitrohexaazaisowurtzitane

The effect of content and particle size of CL-20 on energy,combustion and mechanical properties of NEPE propellant are investigated by the substitution of CL-20 for RDX partially in NEPE propellant.According to the theoretical calculation,the accession of CL-20 makes the specific impulse of the propellant composition with low Al content increase 54N·s/kg.The burning rate of propellant containing CL-20 was higher than the propellant containing RDX,while their pressure exponents were almost the same.With the increase of particle size of CL-20,the burning rate of the propellant varied in a tendency of increase first and then decrease and reached the maximum value at 105～125μm of particle size of CL-20,while pressure exponent varied in a tendency of decrease first and then increase and reached the minimum value of 0.423 at the same particle size.The mechanical properties of the propellant also varied with the particle size of CL-20 and their optimum value was obtain at 125～154μm of particle size of CL-20.