微纳米RDX颗粒级配对压装PBX性能影响

为了提高高聚物粘结炸药(PBX)的力学性能,降低其机械感度,采用溶液-水悬浮法,制备了含微纳米RDX不同颗粒级配(100/0,95/5,90/10,80/20)的PBXs。用光学显微镜观测其表观形貌,并测试了机械感度、力学性能以及爆速等性能。结果表明,微纳米RDX颗粒级配的PBX造型粉颗粒偏小、形貌规则、呈类球形。纳微米RDX颗粒级配为5/95的PBX性能最佳,撞击感度由44%降低到12%,摩擦感度由24%降低到4%;抗压强度从5.55 MPa提高到6.57 MPa,抗拉强度由0.66 MPa提高到0.77 MPa,抗剪强度由1.76 MPa提高到1.96 MPa;爆速从8033 m·s~(-1)增加到8186 m·s~(-1)。

Effects of Nano-/micrometer RDX Particle Gradation on the Property of PBX

To improve the mechanical properties and decrease the mechanical sensitivities of polymer bonded explosives(PBXs), PBXs with 100/0,95/5,90/10,80/20-micrometer/nano- RDX particle gradations were prepared by the solution-water slurry method. Their apparent morphologies were observed with an optical microscope and the mechanical sensitivities, mechanical properties and detonation velocities etc. performances were measured. Results show that the molding powder particles of PBXs with micrometer/nano- RDX particle gradations are smaller and the samples reveal in ball-like particles with regular morphology. PBX prepared with 5% nano-RDX and 95% micrometer-RDX has the best properties, compared with micrometer-RDX based PBX, and the impact sensitivity of PBX with 5% nano-RDX and 95% micrometer-RDX decreases from 44% to 12% , friction sensitivity decreases from 24% to 4%, compression strength increases from 5.55 MPa to 6.57 MPa, tensile strength increases from 0.66 MPa to 0.77 MPa, shear strength enhances from 1.76 MPa to 1.96 MPa, and detonation velocity increases from 8033 m·s^-1 to 8186 m·s^-1.