硝基胍发射药的微观力学性能研究

Research on Microcosmic Mechanical Properties of NQ Propellant

为了研究硝基胍(NQ)发射药力学性能较差的原因,采用原子力显微镜(AFM)的接触模式和轻敲模式,获得了NQ预浸润法和一次性胶化法制备的NQ发射药样品内切面的形貌、相位和摩擦力信号图片,同时对NQ预浸润法制成的发射药样品进行了力谱分析。用扫描电镜(SEM)得到了NQ预浸润法制备的NQ发射药样品的脆断面照片。通过热机械分析仪(TMA)测定了组成NQ发射药各组分的线胀系数。在各测试结果分析对比的基础上,得出结论:NQ发射药各微结构的晶粒缺陷及其温度依赖性是造成发射药力学性能较差的主要原因,在制备过程中尽可能消除这2个不利因素可以提高其力学性能。

In order to find the reason about inferior mechanical properties of NQ gun propellant（NGP） , the topography images, phase images and friction force signal pictures of cut surface of NGP prepared by pre-soaked NQ process （PSNP） and one-off gelatinization process （OOGP） were acquired in Contact Mode and Tapping Mode of atomic force microscopy （AFM）. At the same time, the force map of cut surface of NGP prepared by PSNP was obtained and analyzed. The brittle fractured surface picture of sample prepared by PSNP was scanned using the scanning electronic microscope （SEM）. The linear expansion coefficients of NGP components were obtained from thermomechanical analysis apparatus（TMA）. In conclusion, based on comparative analysis, the results reveal that the inferior mechanical properties of NGP are due to the defects in microstructure of NGP and the dependency of these defects on circumstance temperature. The mechanical properties of NGP could be improved by eliminating these adverse factors whenever possible.