温度对粒铸XLDB推进剂固化的影响

Effect of the Temperature on the Curing Process of Interstitial?casted XLDB Propellant

采用造粒浇铸工艺制备交联改性双基(XLDB)推进剂,研究了固化温度对XLDB推进剂的品质,力学性能,燃烧性能的影响,通过光学显微镜和扫描电镜观察了粒铸XLDB推进剂不同固化时间的微观形态变化,分析了粒铸XLDB推进剂的固化机理,明确了温度对粒铸XLDB推进剂固化影响的原因,提出了粒铸XLDB推进剂台阶式固化温度方案:固化前期的温度应低于45℃,为物理固化的顺利进行提供充足的时间;固化后期的温度可提高到60℃,以加快化学固化的完成。结果表明,固化温度是影响粒铸XLDB推进剂品质的关键因素,随着温度的升高,化学固化速度比物理固化速度提高的幅度大,粒铸XLDB推进剂固化的品质在很大程度上取决于固化初期物理固化和化学固化的速度对比,固化初温高于45℃对提高粒铸XLDB推进剂性能不利。

The cross-linked modified double base (XLDB) propellants have been prepared by an interstitial.casting technique.The effect of the temperature on the curing quality has been investigated.By observation of the dependence of micro.structure of the propellants on curing time,the possible curing mechanisms of the XLDB propellants has been proposed.The effect of temperature the curing quality of interstitial.casted XLDB propellants has been clarified.A step.curing temperature scheme has been proposed.To provide sufficient time for the smooth completion of the physical curing processes,the curing temperature of the initial stage should be lower than 45 ℃,and the curing temperature of the ending stage should be increase to 60 ℃,so as to accelerate the completion of the chemical curing process.The results show that the curing temperature is the key factor that determines the curing quality and the performances of the interstitial.casted XLDB propellants.Along with temperature rise,the increasing extent of chemical curing rate is higher than the physical curing rate,the performances of these propellants dependent largely on the ratio of the physical to chemical curing.A higher temperature at the initial stage is not preferable for the quality improvement of the propellants.