高能固体推进剂基体/填料界面多尺度分析与表征

Multi-scale analysis and characterization of matrix/filler interface of high energy solid propellant

针对高能固体推进剂基体/填料界面难以定性定量表征的问题,分别采用宏观尺度上的拉伸力学性能实验、细观尺度上的纳米压痕实验、微观尺度上的红外和原子力显微镜(AFM)等测试方法对界面过渡区进行了表征。结果表明:加入键合剂NPBA,使界面过渡区的力学性能得到显著提高,且缩小了界面区与黏合剂本体力学性能的差异,表现为基体/填料界面过渡区存在模量梯度,其模量值在0.12×10^(7.5)~8.27×10^(7.5)Pa,比基体模量高1个数量级。分析认为,NPBA改善了界面过渡区的模量和黏附力,最终使固体推进剂的力学性能得到提高。

In view of the difficulty to qualitative and quantitative characterization of the matrix/filler interface of high energy solid propellant,the interfacial transition zone was characterized by macro-scale tensile mechanical performance experiments,meso-scale nano-indentation experiments,and micro-scale infrared and atomic force microscope(AFM),respectively.The results showed that the addition of NPBA bonding agent significantly improved the mechanical performance of the interfacial transition zone,and reduced the difference of mechanical performance between the interfacial zone and the binder bulk.That was manifested by the existence of a modulus gradient in the matrix/filler interfacial transition zone with modulus values ranged from 0.12×10^(7.5)Pa to 8.27×10^(7.5)Pa,which was one order of magnitude higher than that of the matrix.It was analyzed that NPBA improved the modulus and adhesion force in the interfacial transition zone,which ultimately improved the mechanical performance of solid propellant.