RDX基浇铸PBX的老化性能  

Aging Properties of Casted RDX-based PBX

作　　者：丁黎[1] 郑朝民[1] 梁忆[1] 刘文亮[1] 常海[1] 

机构地区：[1]西安近代化学研究所,陕西西安710065

出　　处：《含能材料》2015年第2期156-162,共7页Chinese Journal of Energetic Materials

摘　　要：采用-55-71℃温度循环老化试验,研究了RDX基浇铸高聚物粘结炸药（PBX）老化时,随时间的外观变化、结构完整性、质量/体积变化率、机械感度、力学性能及发射安全性。进行了65,75,85,95℃老化试验和老化样扫描电镜（SEM）及动态力学分析（DMA）的研究。结果表明,25个温度循环后,PBX炸药装药内部无可见裂纹和气孔,结构完整性未发生变化,质量/体积变化率小于1%,撞击感度增加到16%,在锤重400 kg和落高3 m的撞击条件下,未发生爆炸,PBX的抗压强度增加、压缩率下降,力学性能显著劣化。65℃恒温老化252 d后,抗压强度增加47.5%,压缩率下降9.8%。随老化时间延长,β松弛的动态力学损耗峰值（tanδ）降低,网络交联程度提高,与填料之间的结合更为紧密,显示后固化交联反应是力学性能劣化的原因之一。The changes in appearance, structure integrality, mass /volume change rate, mechanical sensitivity, mechanical performance and launch safety of casted RDX-based polymer bonded explosive（PBX） with time during aging were studied by an accelerated aging test with temperature cycle from -55 ℃ to 71 ℃. The aging test at65, 75, 85, 95 ℃, and SEM and DMA study of aging samples were carried out. Results show that after 25 temperature cycles aging test, there is no visible fissure and pores in PBX, and the structural integrity does not change, and the mass/volume change rate is less than 1%. The impact sensitivity increases to 16%. The explosion does not occur under the impact conditions of drop weight of 400 kg and drop height of 3 m. The compressive strength increases, and the compression ratio decreases, and the mechanical properties of the PBX deteriorate obviously. The compressive strength increases by 47.5% and compression ratio decreases by 9.8% after aging 252 d at 65 ℃. With the aging time extended,the dynamic mechanical loss peak（tanδ） of β relaxation decreases,the crossing degree of polymer network increa- ses and polymer combine with filling material tightly, showing that crossing reaction of post curing is one of the reason about mechanical properties deterioration.

关 键 词：浇铸PBX 加速老化 极限力学性能 动态力学性能 

分 类 号：TQ560.1[化学工程—炸药化工]