Propellants for MEMS-based solid microthruster should have low thermal stability. The propellant for MEMS-SPMT is a propellant compond of four ingredients, lead styphnate as the main ingredient, nitrocellulose as the hinder, ammonium perchlorate and superfine aluminium powder as additives. The effects of ammonium perchlorate, aluminium powder and nitrocellulose on the thermal stability of lead styphnate and the thermal decomposition characteristics of four propellants were investigated by DSC. The energy characteristics of four propellants with two expansion ratios(area ratios) of the nozzle were evaluated by using CEA software. The results show that: The effects of ammonium perchlorate and aluminium powder on the thermal stability of lead styphnate is little. The nitrocellulose makes the thermal stability of lead styphnate decrease. The thermal stability of the propellants decreases when the the mass ratio of nitrocellulose to ammonium perchlorate increase. The specific impulse of the propellant can be improved in two cases, one is when the mass content of nitrocellulose and ammonium perchlorate increase, the other is when the expansion ratio of the nozzle is enlarged.%以斯蒂芬酸铅作为推进剂的主要组分,硝化棉为粘接剂,通过添加高氯酸铵、细铝粉,得到了可用于MEMS-SPMT的推进剂.采用DSC研究了高氯酸铵、铝粉、硝化棉对斯蒂芬酸铅热稳定性的影响,研究了4种推进剂配方的热解特性,并利用CEA软件进行热力计算,研究了2种喷管扩张比(面积比)下4种推进剂配方的能量特性.结果表明,高氯酸铵和铝对斯蒂芬酸铅的热稳定性无明显影响,硝化棉能降低斯蒂芬酸铅的热稳定性.硝化棉与高氯酸铵质量比大的推进剂热稳定性较低.增加硝化棉、高氯酸铵的质量含量和增大喷管扩张比均能提高推进剂比冲.
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