Al粉与高能炸药混合物的激光点火特性

Laser Ignition Characteristics of Mixtures of Aluminium Powder and Explosives

采用CO2激光点火的方法,研究了Al粉与RDX、Al粉与HMX、Al粉与CL-20混合物在不同激光功率密度作用下的点火特性,探讨了Al粉粒度、Al/RDX比例以及不同高能炸药对混合物点火性能的影响。实验结果表明,在本实验的激光功率密度条件下,Al粉与RDX等高能炸药混合物的点火均首先发生在试件表面,点火延迟时间随着激光功率密度增加呈现递减的趋势。在较低功率密度条件下,Al粉的粒度和Al/RDX比例对微米Al/RDX混合物的点火影响较大,随着激光功率密度的增加,影响减弱;含纳米Al粉的混合物点火延迟时间短于含微米Al粉的混合物,且点火反应更剧烈。相同激光功率密度条件下,含纳米Al粉与RDX的混合物(M-QR)、纳米Al粉与HMX的混合物(M-QH)、纳米Al粉与CL-20混合物(M-QCL)的点火延迟时间顺序为tM-QR>tM-QH>tM-QCL,最小点火能量的顺序为EM-QR>EM-QH>EM-QCL,与3种高能炸药的最小点火能量的顺序EHMX<ERDX<ECL-20不同,其中纳米Al粉与CL-20的混合物点火反应最为剧烈。

Ignition characteristics of the mixtures of Al powder and pure RDX, HMX and CL-20 are studied by using CO2 laser with a wavelength of 10.6 μm, and the effects of the Al granularity, the ratio of Al to RDX and different explosives of the mixtures on ignition characteristics of the mixtures are discussed under different laser heat fluxes. The results show that the ignition of the mixtures tested appears on the surface of the sample, and the ignition time delays of the mixtures gradually decrease with the increase of the laser flux. The effects of Al granularity and the ratio of Al to RDX on the sample igintion are larger at lower laser fluxes and slightly weaken with the laser flux increasing. The delay time of the mixture containing aluminium nano-powder is shorter than that of the mixture containing aluminium micro-powder, and the ignition process is more drastic. The order of the delay time of the mixtures of nano-alumimium with RDX （M-QR）, HMX （M-QH） and CL-20 （M-QCL） is tM-QR〉tM-QH〉tM-QCL and the order of the minimum ignition energy is EM-QR〉EM-QH〉EM-QCL which is defferent from the order of RDX, HMX and CL-20 that isEHMX〈ERDK〈ECL-20, and the iginition of the mixture of nano aluminium power with CL-20 is the most violent.