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为探讨钙钛矿型氧化物对硝胺改性双基推进剂燃烧性能的影响,用硬脂酸凝胶燃烧法制备了钙钛矿型La0.8Sr0.2CoO3-δ,运用X射线衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外(FT-IR)光谱及光电子能谱(XPS)技术对所得粉体进行了表征,并用热重-差示扫描量热(TG-DSC)技术研究了La0.8Sr0.2CoO3-δ对推进剂中主要组分黑索今(RDX)的催化热分解作用,实验了La0.8Sr0.2CoO3-δ粉体对硝胺改性双基推进剂的燃速和压力指数的影响。结果表明:添加2.0%La0.8Sr0.2CoO3-δ可使RDX分解峰温提前,且分解热增加;与不加La0.8Sr0.2CoO3-δ相比,在所有的压力下,La0.8Sr0.2CoO3-δ的少量添加使推进剂燃速有不同程度的提高,且使推进剂的压强指数降低;与LaCoO3相比,La0.8Sr0.2CoO3-δ对硝胺改性双基推进剂的燃烧表现了更好的催化作用。
In order to investigate the effect of perovskite oxides on the combustion performance of nitroamine-modified double-base propellants, a perovskite-type La0.8Sr0.2CoO3-δ perovskite was prepared by stearic acid gel combustion. The XRD , Scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and photoelectron spectroscopy (XPS) were used to characterize the powders. The thermogravimetry-differential scanning calorimetry The catalytic pyrolysis of La0.8Sr0.2CoO3-δ on RDX was studied. The effect of La0.8Sr0.2CoO3-δ powder on the combustion of nitroamines modified double base propellant Effect of speed and pressure index. The results show that the addition of 2.0% La0.8Sr0.2CoO3-δ can lead the RDX decomposition peak temperature earlier and increase the heat of decomposition. Compared with the non-La0.8Sr0.2CoO3-δ, La0.8Sr0.2CoO3- The addition of -δ in a small amount increased the burning rate of the propellant to different extents and decreased the pressure exponent of the propellant. Compared with LaCoO3, the combustion of La0.8Sr0.2CoO3-δ on the nitroamine-modified double base propellant showed Better catalysis.