Study on the interfacial binding strength of the end-surface-binding coated propellant

The effect of the coated propellant charge controlling gas producing rate, lowing ballistic temperature coefficient and improving the muzzle velocity is partly came from the effect of the coating-layer. To the coated propellant of grain end-surface binding the prefabricated coating-layer (GESBPCL), the properties of the coating-layer such as thickness, density, strength, etc., have been controlled exactly according to the requirement of ballistic design and propellant charge design, and the effectiveness and reliability of the effect of the coating-layer controlling the gas producing rate of charge rely on the interfacial binding strength (IBS) between the coating-layer and base grain. Hence, the IBS of the GEBSPCL propellant was tested by the fall-hammer test, and the influences of the binding technique conditions to the IBS of the GEBSPCL propellant was studied. The good adhesive and binding technique conditions were selected by the tests. The GEBSPCL propellant grains of high IBS was prepared.