.mg / Ptfe-poor Oxygen Pyrotechnic Propellant Performance And Process Test Research

In order to get the Mg/PTFE fuel-rich pyrotechnical propellant which is intended for use in solid rocket ramjet, this paper did many experiments and researches. Firstly, the thermodynamic and kinetic parameters of the Mg/PTFE fuel-rich propellants on different oxygen balance were calculated. According to the results, the best basic formula whose negative oxygen is -0.9 (mMg:mPTFE=7:3) was carried out to experiment on combustion performance, thermal stability and sensitivity.Secondly, this paper studied the combustion performance of Mg/PTFE fuel-rich pyrotechnical propellant preparing by three methods:compression molding process, pouring process and vacuum vapor deposition technology. Analyzed the influence of different factors specially in condition of compression molding process and pouring process. Optimized the given based formula through orthogonal experiment. We obtained the optimization formulation suitable for molding process:magnesium powder particle size is 25.55μm, PTFE particle size is 5μm, the compression pressure is 2Mpa and adhesives is phenolic resin whose content is about 15%. We obtained the optimization formulation applying to pouring molding process:the diameter of Mg is 25.55μm, the content of HTPB is 30%, with about 2% isophorone diisocyanate as curing agent and keeping temperature 60～70℃for 6 to 7 days. Therefore, explored the feasibility of prepare Mg/PTFE fuel-rich propellant by vacuum vapor deposition process and tested it's combustion properties.The results showed that the Mg/PTFE fuel-rich pyrotechnic propellant prepared by molding have better performance:the flame temperature is 1700K, the linear burning rate is 8.39mm/s, the mass burning rate is 3.93g.cm-2.s-1. The performance of Mg/PTFE fuel-rich pyrotechnic propellant prepared by casting is also good:the linear burning rate is 13.96mm/s, the mass burning rate is 2.56 g.cm-2.s-1. Both them meet the performance requirements of solid rocket ramjet. However, the quality of Mg in the Mg/PTFE composite membrane is too small to meet the requirements of the negative oxygen balance. So that it have a long way to go and further more researches should be do before vacuum vapor deposition technology used for preparing Mg/PTFE fuel-rich pyrotechnic propellant.