摘要
激光加工具有"冷加工"和"热加工"鲜明的两重性,研究飞秒激光加工点火药必须严格控制"热加工"过程的出现,以保证加工安全和实现微细加工。本文以B/KNO_3点火药为样品,利用ANSYS软件,模拟单脉冲飞秒激光作用后点火药样品的轴向和径向温度分布,结果表明,样品表面冲击温度达3 337℃。从理论讨论了加工过程的安全性,得出单脉冲加工点火药的热影响区半径约为4μm,烧蚀深度约为0.6μm。通过实验分析了其烧蚀机制,并测得点火药的烧蚀阈值为0.284J/cm^2。
Laser processing has a distinct dualit y-“cold machining” and “hot machining”.In the research of femtosecond laser machining amorce,the “hot machining” must be strictly controlled to ensure th e safty of machining process and realize fine machining.In this paper,the axial and radial temperature distribution of B/KNO3amorce ablated by a single pulse laser radiation were simulated by ANSYS. The results showed that the shock temperature of the sample surface is up to 3337℃.The machining safty is discussed theoretically,and the radius of heat affected zone of amorce after a single femtosecond laser pulse ra diation is about 4μm and the ablation depth is about 0.6μm.The ablation mechanism is analyzed through exper iments,and the ablation threshold of the amorce is calculated to be 0.284J/cm 2.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2017年第12期1378-1383,共6页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(11574159
11647081)
浙江省自然科学基金(LQ15A040003)
强场激光物理国家重点实验室开放基金(中国科学院上海光学精密机械研究所)资助项目
关键词
飞秒激光
点火药
温度分布
烧蚀阈值
femtosecond laser
amorce
thermal analysis
Ablation threshold
