【摘要】 利用光电测试法、差热分析(DTA)和扫描式电子显微镜(SEM)分析方法,研究了B/KNO3和B/KNO3/酚醛树脂两种药剂激光点火过程中的烧蚀现象,分析了酚醛树脂对B/KNO3烧蚀特性的影响。结果表明,B/KNO3药剂中加入酚醛树脂后,化学反应的起始温度由556℃下降到548℃,反应放热量由1.86kJ·g-1增加到2.21kJ·g-1;酚醛树脂能明显降低药剂的烧蚀程度,提高药剂激光点火感度和降低点火延迟时间。加入酚醛树脂后,50%发火能量从17.95mJ降低到9.11mJ,点火延迟时间降低的程度随入射激光能量密度增大而减小。当入射激光能量密度为5J·cm-2时,点火延迟时间从17.5ms降低到7.2ms,当入射激光能量密度达到23J·cm-2时,二者点火延迟时间基本趋于一致。更多还原

【Abstract】 The ablation problem in laser ignition of energetic material was studied by means of scanning electron microscope（SEM）,photoelectric method and differential thermal analysis（DTA）. The effect of phenolic resin on laser ablation was investigated. The results show that after adding phenolic resin,the initiation temperature of the reaction change from 556 ℃ to 548 ℃,and reaction heat changes from 1.86 kJ·g -1 to 2.21 kJ·g -1 . In comparison with B/KNO₃,B/KNO₃ with phenolic resin is more sensitivity,and has smaller ablation and shorter delay time as well. After adding phenolic resin,the 50% fired energy was less than that without phenplic resin,changing from 17.95 mJ to 9.11 mJ. The reduce degree of the delay time was inverse proportional to the laser energy density. When the laser energy density was 5 J·cm -2 ,the delay time changed from 17.5 ms to 7.2 ms. When the laser energy density was 23 J·cm -2 ,the difference between the delay times was little.更多还原