显微红外光谱法测定EI发射药中钝感剂扩散系数

压伸-浸渍(EI)发射药制造过程中钝感剂的扩散决定了新制火药的内弹道性能。采用红外光谱显微技术考察了聚酯钝感剂PA在EI发射药中的扩散,结果表明新制火药的钝感剂浓度分布符合Fick第二定律的扩散模型,并依据浓度分布曲线方程推算出钝感工艺过程中的钝感剂扩散系数为1.639×10-13m2.s-1。内标法与外标法的比对实验结果表明,在内标法中将钝感层硝化甘油(NG)做均匀分布的数学处理对扩散系数计算结果的数量级没有影响,因此由于数学模型的不完善带来的浓度分布曲线的系统偏差可以忽略不计。

Determination of Diffusion Coefficient of Deterrent in EI Propellant by FTIR Microspectroscopy

The diffusion of deterrent in manufacturing process determines the interior ballistic performance of newly manufactured extruded impregnated propellants. The diffusion of polymeric deterrent was investigated by FTIR microspectroscopy. The results show that the concentration profile of deterrent of newly manufactured propellant is in accord with the Second Fickian diffusion model. The diffusion coefficient of deterrent in manufacturing process can be calculated by the concentration profile equation,which is 1.639×10^-13 m²·s^-1. A comparative experiment was carried out between internal standard method and external standard method. The results show that in the internal standard method the mathematical treatment of uniform distribution of NG in deterred layer has no effect on the order of magnitude of the diffusion coefficient,so the systematical deviations of the reconcentration profile obtained from the imperfection of calibration model can be neglected.