纳米金属粉对RDX热分解特性的影响

Effects of Nanometer Metal Powders on Thermal Decomposition Characteristics of RDX

用DSC研究了纳米Cu粉、纳米Ni粉、超细Al粉、超细Ni粉和普通Cu粉对RDX热分解特性的影响。实验结果表明 ,纳米Cu粉使RDX的分解活化能降低了 2 .3kJ/mol,使RDX分解放热峰的峰温降低了 2 4.9℃。纳米Cu粉对RDX热分解特性的影响程度比普通Cu粉要大很多 ;其它几种金属粉 ,无论粒度如何 ,对RDX的热分解特性的影响均不大 ;在 0 .1MPa、2 .0MPa和 6 .0MPa下 ,随压力增大 ,RDX/纳米Cu粉样品的峰形变化规律和RDX的不同。在RDX/纳米Cu粉的样品中 ,随纳米Cu粉含量降低 ,Cu对RDX热分解特性的影响程度逐渐降低 ,峰温向高温区移动。但当RDX与纳米Cu粉的质量比从 15∶1变到 2 0∶1时 ,RDX的峰温却向低温方向移动。探讨了纳米Cu粉对RDX热分解的作用机理。

The effects of nanometer metal powders (Cu, Ni), super fine metal powders (Al,Ni) and normal metal powders (Cu, Al) on the thermal decomposition characteristics of RDX have been investigated by DSC. Results show that the apparent activation energy of the thermal decomposition of RDX decreases 2.3 kJ/mol due to the effect of nanometer Cu, thus reducing results in that the peak temperature of the thermal decomposition of RDX by 24.9 ℃ downward. The influence of nanometer Cu on the thermal decomposition of RDX is much greater than that of normal Cu. Nevertheless, for other metal powders, their influences on the thermal decomposition behavior of RDX are very little, whether their particle sizes are big or small. At 0.1, 2.0, 6.0MPa pressure, the change of peak shape of RDX in the mixture of RDX/nanometer Cu is totally different from that of RDX. In the mixture of RDX/nanometer Cu, the influence of nanometet Cu on the peak temperature of the thermal decomposition characteristics becomes weak with the content of nanometer Cu decreasing and causes the peak temperature of the thermal decomposition of RDX to shift upward. However, when the ration of RDX to nanometer Cu changed from 15∶1 to 20∶1, the peak temperature of the thermal decompsition of RDX shifts downward. The mechanism of nanometer Cu on the thermal decomposition characteristics of RDX has been explored.