Combustion of composite propellants with titanium

The combustion of $12$ composite propellants of the following composition was studied: $60\%$ ammonium perchlorate of the sieve fraction ($180{-}250$ $\mu$m), $20\%$ energetic binder, and $20\%$ titanium particles of different sizes and types (spongy particles of size $D=32{-}71$ $\mu$m and rolled pseudospherical particles of size $D= 71{-}500$ $\mu$m). The burning rates and agglomeration parameters of the metallic component at a pressure of $0.35$ MPa in nitrogen and $0.1$ MPa in air were determined. It was found that agglomerates of minimum size were formed when using titanium powder with minimum particles size.