Preparation Of Insensitive Rdx, Hmx Ultrafine And Its Sense Mechanism Research

The Sensitivity will decrease if the particle size of energetic material are reduced. But now, the superfine RDX, HMX can only be produced in the laboratory, it is unable to achieve industrial production. And there are no reports systematic analyzed the mechanistic of sensitivity reduction. For the above two problems, this paper used pulverized machine HLGB-50to parepare superfine RDX, HMX. And the mechanistic of sensitivity reduction were analyzed to reduce the probability of hot-spot generated and growth. The main researeh contents are as follows.Firstly, superfine RDX, HMX were prepared by pulverized machine HLGB-50. The particle size distribution was traced by the laser particle size analyzer and was characterized through SEM, TEM. The contaminants were detected by FT-IR, XRD and ICP-AES. The results showed that the particle size of superfine RDX, HMX (d50) were0.32μm,(d90) and0.68μm. The particle size distribution will be narrow as the increase of milling time. The product got a high-purity.Then, the particle size and impact sensitivity were tested to indicate the stability. The friction and impact sensitivity were reduced as reducing of particle size. The impact sensitivity of superfine RDX was41.9%lower than raw RDX, and97.5%for HMX. The friction sensitivity of superfine RDX was26.0%lower than raw RDX, and22.0%for HMX The friction sensitivity for HMX of0.5μm particle size (d50) was no significant different with the final production.Finally, The mechanistic of sensitivity reduction was analyzed in terms of hot-spot generated and growth. The crystal internal defects of RDX, HMX were studied by OMS and AFM, which would disappeare after milling. The extra-granular pores of superfine RDX, HMX were much smaller than raw testified by BET and SEM. And the increasing of plastic yield strength and viscosity caused by the two reasons described above plus the spherical smooth surface lead to the reduction of the probability of Hot-spot generated for superfine RDX, HMX. The superfine RDX, HMX have higher thermal conductivity than raw by Hot Disk. The heat release of superfine RDX, HMX were lower than raw by DSC. So there were lower probability of Hot-spot growth of superfine RDX, HMX.