偶氮四唑胍对含催化剂的RDX-CMDB推进剂燃烧性能的影响研究

Study on the influences of guanidinium azotetrazolate on combustion characteristics of RDX-CMDB propellants containing catalysts

采用浇注工艺制备了GZT部分取代RDX的系列含催化剂的RDX-CMDB推进剂样品。研究了GZT对含催化剂的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,对比分析了GZT对含催化剂和不含催化剂的RDX-CMDB推进剂燃烧行为影响不同的原因,并采用DSC实验初步研究了含GZT和催化剂的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、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内,GZT使含催化剂的RDX-CMDB推进剂燃速降低,压强指数升高;热行为研究表明,含催化剂的GZT-RDX-CMDB推进剂的DSC曲线上出现了GZT单独分解峰,且DSC的第一分解峰温随GZT的加入而减小。

Samples of RDX-CMDB propellants containing catalysts with RDX replaced by guanidinium azotetrazolate （GZT） were prepared using slurry casting technique. The influences of GZT on combustion behaviors of RDX-CMDB propellants including burning rates, pressure exponents and flame structure were studied, and the reasons for the difference of combustion behaviors between propellants with catalysts and without catalysts were analyzed. The thermal behaviors of propellants were analyzed through the difference scanning calorimeter（DSC）. Results indicate that GZT has great effects on flame temperature, width of dark zone, num- bers of lighting point on the combustion surfaces and temperature gradient of combustion surface to condensed phase. The burning rates of propellants decrease with the increase in GZT content under pressure ranging from 1 MPa to 10 MPa,while pressure exponents increase. In the DSC curve of propellants containing GZT and catalysts, a new independent decomposition peak corresponding to decomposition of GZT appears, and the first decomposition peak temperature decreases with addition of GZT into propellant.