Effect of additive modifiers on the combustion characteristics of composite aluminized propellants

We studied the effect of modifier additives TiB2, AlMgB14, (NH4)2TiF6, NH4BF4, Ca3(PO4)2 on the combustion parameters of composite propellants based on aluminum powder as a fuel (about 20% wt.), ammonium perchlorate as an oxidizer (about 60% wt.), and energetic binder (MPVT about 20% wt.). Additives were introduced in an amount of about 2%. The burning rates of propellants were measured and condensed combustion products were studied at a pressure of 0.35 MPa. The effect of additives was assessed using the following parameters: increasing the burning rate, reducing combustion incompleteness, mass and size of agglomerates. The most effective additives were NH4BF4 and TiB2. Conclusions are drawn about the prospects of using the studied additives to obtain the required combustion parameters.