关键词: 固体推进剂;复合推进剂;添加剂;燃速调节剂;燃速测试;热分析

Abstract: AP/HTPB based composite propellants with additives such as ammonium oxalate （AO）, strontium carbonate （SC）, mixture of ammonium oxalate / strontium carbonate and mixture of oxalamide （EDA）/strontium carbonate were investigated by burning rate experiments and TG/DTG analysis. The results showed that the burning rates of these propellants were decreased. Not only decomposition temperatures of AP with these additives were increased,but also their activation energy were also increased. Because of these, the burning rates of these propellants were decreased. Analysises were proved that the decomposition products of ammonium oxalate impediment decomposition of AP in low temperature or high temperature. The reaction of strontium carbonate with perchloric acid produced Sr（ClO₄）₂ which is difficult to decompose and increase the peak temperature of AP decomposition. Results of burning rate experiments also showed that mixture of ammonium oxalate/strontium carbonate and mixture of oxalamide/strontium carbonate have strongly coordinative effects on reducing AP/HTPB propellants burning rate when the pressure is more than 5 MPa. Especially, mixture of oxalamide/strontium carbonate not only can decrease burning rate of propellants, but also pressure exponent is the lowest.

Key words: Solid propellant;Composite propellant;Additive;Burning rate modifier;Burning rate testing;Thermal analysis