Study on the adhesive mechanism of erosion reducing additive on the bore surface of gun barrel

Abstract

Abstract In view of the erosion and wear of gun barrel, adhesive mechanism of erosion reducing additive (ERA) is studied based on the formation of adhesive layer (AL) on the bore surface for heat insulation. Firstly, we use polysiloxane/boride ERAs and semi-closed bomb device to carry out simulated shooting experiments. After that, micro morphology of AL is analyzed by SEM-EDS. Then the effect of polysiloxane viscosity, boride mesh, boride content and shooting number on ALs is investigated by analyzing the differences in micro morphology. Results show that viscosity and fluidity of ERA effectively affect the adhesive process. As polysiloxane viscosity increases, the viscosity of ERA increases and the fluidity of ERA decreases. As boride mesh increases, the viscosity of ERA decreases, and the fluidity of ERA increases. As boride content increases, the fluidity of ERA decreases. Under high temperature and high speed airflow, AL is peeled off from substrate, while ERA particles in the gunpowder gas adhere to the substrate or the previous AL and form a new AL. As the shooting proceeds, ERA continuously performs the cycle process of adhesion-shedding-re-adhesion-re-shedding, and there is always a protective layer to prevent high-temperature heat flow from eroding the bore surface.