The effect of ammonium oxalate,lithium fluoride,calcium carbonate,strontium carbonate,quaternary ammnium salt and etc.as burning rate inhibitors on burning rate of HTPB/AP/Al propellant have been investigated.Considerable decrease in burning rate has been observed when quaternary ammonium salt composite with carbonate or lithium fluoride are used as depressant,and above-mentioned composite inhibitors have excellent effect on decreasing the burning rate of propellants.In HTPB/AP/Al propellants,the quaternary...