Zr粉粒径对Zr/KClO_4烟火剂燃烧特性的影响  

Effects of zirconium size on combustion characteristics of Zr/KP pyrotechnics

作　　者：张强[1,2] 康晓丽[2] 罗江山[2] 唐永建[2] 易勇[1,2] 李恺[2] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2011年第7期1867-1872,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10804101)

摘　　要：研究了烟火药激光器泵浦源传统配方Zr/KClO4中Zr粉粒径对该配方燃烧特性的影响。结果表明:Zr粉从61.375μm减小到18.675μm,Zr/KClO4混合物的点火温度从506.40℃降低到492.42℃,燃烧辐射脉宽由60 ms缩短到25 ms,峰值辐射强度增加1倍;在200～1 100 nm波段内,随着Zr粉粒径的减小,可见光区内的辐射能所占的比例增强;针对掺钕激光介质的泵浦而言,Zr粉粒径为800目时,分布在激光介质的3个主要泵浦带内的辐射能最高,而且闪光脉宽最短。因此,在其它条件相同时,选择颗粒尺寸小的Zr粉有利于获得高的激光输出。Aiming at solving the problem of low pumping efficiency of typical Zr/KClO4 pump source for pyrotechnically pumped laser,influence of particle size of Zr powders on the combustion property of Zr/KClO4 was investigated.It was indicated when the particle size of Zr powders decreased from 61.375 μm to 18.675 μm,the ignition temperatures of Zr/KClO4 dropped from 506.40 ℃ to 492.42 ℃,flash radiation lasting time shortened from 60 ms to 25 ms,peak flash intensities increased about 1 times.Spectral measurement showed the radiation spectra of Zr/KClO4 were continuous spectra with superposition of selective linear or band emissions of excited atoms or molecules.With the decrease of Zr particle,the emission of molecular ZrO strengthened,and radiation efficiency within visible ranges was also increased.As for pumping Nd-doping laser medium,the radiation spectra had the highest distribution proportion using 800 mesh Zr powders and shortest flash pulse width.It is suggested that employing fine Zr powers favors a high laser output when other conditions are similar.

关 键 词：烟火药激光器 Zr粉 粒径 燃烧特性 辐射光谱 

分 类 号：TN248[电子电信—物理电子学]