Mostafa Ghorbani - Malek Ashtar University of Technology, Tehran, Iran

The physic-chemical characteristics of spherical and coarse Aluminum particles were determined. The rheological properties of Al/HTPB mixtures were investigated. The burning rate performance and mechanical properties of fuel rich propellant were evaluated. The results show that the spherical Aluminum particles could be dispersed in the HTPB binder with lower viscosity and yield stress than those of the coarse ones. The burning rate and pressure exponent of propellant with spherical particles increased compared with the coarse ones, and the percent elongation is much higher than that of coarse one, whereas, the tensile strength shows reverse.

Material chemistry, solid propellant, Spherical Aluminum particles, Shape and size distribution, Burning rate, Mechanical property