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 Alexander Yu.Dolgoborodov;Vladimir G.Kirilenko;Michael A.Brazhnikov;Leonid I.Grishin;Michael L.Kuskov;Georgii E.Valvano

作者机构：Joint Institute for High TemperaturesRussian Academy of SciencesRussia N.Semenov Federal Research Center for Chemical PhysicsRussian Academy of SciencesRussia National Research Nuclear University MEPhI MoscowRussia 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2022年第18卷第2期

页      面：194-204页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0703[理学-化学] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

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。 

主　　题：Nanothermites Laser ignition Burning rate Ignition delay 

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.