2,4-二硝基苯甲醚与TNT凝固行为的差异性分析

Analysis on Differences of Solidification Behavior of DNAN and TNT

为了解2,4-二硝基苯甲醚(DNAN)凝固缺陷的特征及产生的原因,采用量筒称量法测试了DNAN和TNT样品的液相密度,并计算出样品的体积收缩率;用工业CT和扫描电镜对DNAN和TNT药柱的凝固缺陷分布情况进行观测;用DSC和导热系数测定仪测试了DNAN和TNT药柱的热性能参数;用自制的凝固速率测试装置测试了DNAN和TNT药柱中不同部位温度随时间的变化规律,计算了不同凝固层厚度下的平均凝固线速度。结果表明,DNAN的体积收缩率为13.2%,高于TNT;其凝固缺陷的分散度高于TNT;在凝固过程初期,DNAN的平均凝固线速率与TNT相当,随着凝固层厚度的增加,其凝固速率快速增加并显著高于TNT。DNAN的凝固行为不同于TNT,不是逐层凝固,而属于中间凝固。

To understand the characteristics and the causes of 2,4-dinitroanisole(DNAN)solidification defects,the liquid-phase density of DNAN and TNT samples was measured by a cylinder weighing method and the two sample′s volume shrinkages were calculated.The distribution of solidification defect of DNAN and TNT grains was observed by industrial CT and SEM,respectively.Thermal property parameters of DNAN and TNT samples were tested by DSC and thermal conductivity measuring instrument.The change rule of temperature of the different position in DNAN and TNT grains with time was measured by a home-made solidification rate measuring device.The average linear solidification rate under different solidifying layer thicknesses was obtained through calculation.Results show that the volume shrinkage of DNAN is 13.2%,higher than that of TNT.The rate of divergence of solidification defect of DNAN is higher than that of TNT.The solidification rate of DNAN is close to that of TNT during the early solidification process.With increasing the solidified layer thickness,DNAN solidification rate increases rapidly,significantly higher than that of TNT.The solidification of DNAN belongs to mid-solidification,which is different from TNT of layer-by-layer solidification.