中文摘要：

采用折光指数匹配的光学显微技术、浮沉分析技术、扫描电镜、激光粒度等分别对比研究了高品质RDX（D-RDX）与普通RDX的晶间包藏物、晶体表观密度、表面光滑度、颗粒粒度与粒度跨度、晶体形状等晶体特性。结果表明：D-RDX内部缺陷和杂质很少,表观密度大于1.7980 g·cm-3,普通RDX内部存在较多孔隙和杂质,表观密度小于1.7930 g·cm-3,D-RDX比普通RDX表面更光滑,粒度分布更窄。用D-RDX代替普通RDX与TNT浇铸,当D-RDX含量从60%提高到70%时,颗粒间的孔隙率增加0.66%,药柱的冲击波感度从隔板厚度17 mm增加到18 mm,但仍然低于普通RDX的冲击波感度（20 mm）,D-RDX冲击波感度比普通RDX降低10%~15%;将D-RDX和普通RDX用于浇铸固化PBX配方,D-RDX的冲击波感度比普通RDX降低31.4%。研究表明,D-RDX和普通RDX晶体特性的不同导致其冲击波感度的显著差异。

英文摘要：

The crystal characteristics of decreased sensitivity RDX（D-RDX） and commercial RDX（RDX） were studied by optical microscopy with matching refractive index,scan electron microscopy（SEM）,sink-float process and laser particles apparatus.It is found that there was obvious difference of crystal characteristics such as microstructure of inter crystalline voids,particle size and distribution,shape,morphology between D-RDX and commercial RDX.The crystal characteristics value of D-RDX were measured： average particle size being 283μm,the span of size distribution being 0.8,spherical degree being 0.85,smooth particle surface,explosive particles apparent density being above 1.798 g·cm-3.The shock wave sensitivities of D-RDX and commercial RDX were measured using small scale-gap test,from which the decrease level of the shock wave sensitivity of D-RDX melted with TNT is 10%-15% and casted with HTPB is 31.4%.The difference of shock wave sensitivity of melted or casted explosive charge relates closely to the crystal characteristics of RDX.