含偶氮四唑胍的RDX-CMDB推进剂的燃烧性能和热行为研究

采用浇铸工艺制备了GZT部分取代RDX的系列RDX-CMDB推进剂样品。研究了GZT对不含催化剂的RDX-CMDB推进剂的燃速、压强指数及燃烧火焰结构等燃烧性能的影响,并采用TG-DTG和DSC实验,初步研究了含GZT的RDX-CMDB推进剂的热行为。结果发现,GZT对推进剂的火焰温度、火焰的暗区厚度、燃面上的亮点数目和燃烧表面对凝聚相的温度梯度等都呈现一定规律性的影响;在1～10 MPa范围内,GZT使RDX-CMDB推进剂的燃速升高,压强指数降低。热行为研究表明,加入GZT时,推进剂的DSC曲线上出现一个单独的放热分解峰,对应TG曲线上也表现出一个单独的失重过程。

Study on the combustion characteristics and thermal behaviors of RDX-CMDB propellants containing guanidinium azotetrazolate

Samples of RDX-CMDB Propellants with replacement of RDX by guanidinium azotetrazolate(GZT) were prepared using slurry casting technique.The influences of GZT on combustion behaviors including burning rates,pressure exponents and flame structures were studied,and the thermal behaviors of propellants were primarily studied through the thermal analysis experiments DSC and TG-DTG.Results indicate that GZT has great effect on the flame temperature,the width of dark zone,the number of lighting point on the combustion surfaces and the temperature grads of condensed phase.The burning rate of propellants increases with the increase in GZT content under pressure from 1 MPa to 10 MPa,while the pressure exponent decreases.A new independent decomposition peak and a new weight loss process corresponding to decomposition of GZT appear in the DSC curve and TG-DTG curve of propellants containing GZT,respectively.