Study On Application And Relationship Of Structure And Inhibition Effect Of Burning-rate Inhibitor In AP/HTPB Propellant

Combustion property is one of most important performances of solid propellants. The requirement of burning rate for the various engines is different. Untill now, amine compounds, such as ammonium oxalate(AO) and oxamide(OA), have been widely used as burning-rate inhibitor to decrease the burning rate of AP propellants. However, the study on the thermal decomposition characteristics and performance of the propellants with amine inhibitors are incomplete. Moreover, the research of other possible N-H inhibitor like hydrazine compounds and guanidine compounds are still absent.To study the relation between the properties of N-H inhibitor and the burning rate of the propellant, three series of N-H inhibitors are designed.Four kind of the N-H inhibitors, hydrazine oxalate(HO), guanidine oxalate(GO), triaminoguanidine oxalate(TAGO) and oxalylguanidine(OG), were synthesized in the laboratory. Furthermore, the products were validated by IR, element analysis and NMR.The thermal decomposition characteristics of ammonium oxalate(AO), oxamide(OA), hydrazine oxalate(HO), oxalylhydrazine(OH), guanidine oxalate(GO), oxalylguanidine(OG), Dodecyl Trimethyl Ammonium Chloride(DTAC),1-Octadecanaminium,N,N-Dimethyl-N-(3-sulfopropyl), inner salt(ODSI) and the mixtures with AP were studied. The results showed that all the inhibitors restrained the high-temperature decomposition of AP except DTAC, but the thermal decomposition characteristics of AP/inhibitor mixtures were differeent.The AP/Al/HTPB propellants with the N-H compound inhibitors were manufactured. The experimental data showed that all the inhibitors decreased the burning rates of AP/Al/HTPB propellants. Among of them, AO, OG, GO, ODSI and OA/ODSI exhibit the strongest burning-rate inhibition action. However, the specific impulse and explosion heat of all the propellants contained the inhibitors declined. Within all the N-H inhibitors, the addition of amine inhibitors showed the lowest energy performance. Hydrazine inhibitor like oxalylhydrazine(OH) is favor to both the low burning rate and high explosion heatof AP propellants. The lower net thermal decomposition heat of the AP/N-H inhibitor mixture, the lower the burning rate of AP/Al/HTPB propellants is.