Experimental investigation has been carried out for laser ignition and combustion of nanothermites based on aluminum and oxides of copper, bismuth and molybdenum. Ultrasonic mixing of nanosized powders was used to produce compositions. For thermite ignition, initiating laser pulse with a maximum intensity of 770 W/cm² was generated by a laser diode with a wavelength of 808 nm. The ignition delay times, the minimum initiation energy density, and the average burning rate at various thermite densities and mass fractions of components were determined by recording the emission of radiation of the reaction products using a multichannel pyrometer jointly with a high-speed video camera. The effect of adding carbon black on the threshold parameters of a laser pulse was also studied. Based on the obtained results, certain assumptions were put forward with regard to the mechanism of nanothermites’ ignition by laser radiation and their burning. In particular, the assumptions were made on the two-stage process of the reaction initiation and jet burning mechanism of porous nanothermites.

已经对基于铝和铜、铋和钼的氧化物的纳米铝热剂的激光点火和燃烧进行了实验研究。纳米级粉末的超声波混合用于生产组合物。对于铝热点火，启动最大强度为 770 W/cm ^{2的激光脉冲}由波长为 808 nm 的激光二极管产生。通过使用多通道高温计和高速摄像机记录反应产物的辐射发射来确定不同铝热剂密度和组分质量分数下的点火延迟时间、最小引发能量密度和平均燃烧速率。还研究了添加炭黑对激光脉冲阈值参数的影响。根据所得结果，对纳米铝热剂通过激光辐射点燃及其燃烧的机理提出了一定的假设。特别是对多孔纳米铝热剂的反应引发和射流燃烧机理的两阶段过程进行了假设。