Ignition of nanothermites by a laser diode pulse  

作　　者：Alexander Yu.Dolgoborodov Vladimir G.Kirilenko Michael A.Brazhnikov Leonid I.Grishin Michael L.Kuskov Georgii E.Valyano 

机构地区：[1]Joint Institute for High Temperatures,Russian Academy of Sciences,Russia [2]N.Semenov Federal Research Center for Chemical Physics,Russian Academy of Sciences,Russia [3]National Research Nuclear University MEPhI Moscow,Russia

出　　处：《Defence Technology（防务技术）》2022年第2期194-204,共11页Defence Technology

基　　金：supported by a grant for large scientific projects in priority areas of scientific and technological development No.13.1902.21.0035;carried out at Federal Research Center for Chemical Physics,Russian Academy of Sciences(FRC CP RAS),Russian Academy of Sciences(RAS)financially supported by subsidies for the implementation of the state assignment on the topic No.0082-2019-0016。

摘　　要：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.

关 键 词：Nanothermites Laser ignition Burning rate Ignition delay 

分 类 号：TQ560.1[化学工程—炸药化工]