飞秒激光烧蚀血管支架材料的数值模拟

发布时间：2018-03-30 22:35

  本文选题：飞秒激光　切入点：镍钛合金　出处：《中国材料进展》2017年03期

【摘要】：为了研究飞秒脉冲激光烧蚀血管支架材料的特性,利用考虑了电子之间热传导项的双温模型,采用有限差分法,对飞秒激光烧蚀NiTi合金的温度场分布进行数值模拟,计算得到了电子温度和晶格温度随时间和烧蚀深度的变化规律,进一步讨论了不同激光能量密度、不同激光脉宽、不同延迟时间对电子和晶格的温度场影响。发现血管支架材料在飞秒激光的作用下,先是电子吸收能量温度快速升高,再通过电声耦合作用将能量传递给晶格,最后两者的温度达到一个平衡状态;激光能量密度主要影响电子的峰值温度和电子与晶格的平衡温度;脉冲宽度主要影响电子的峰值温度和达到峰值温度所用的时间;电子温度随着延迟时间的增加先升高后降低,晶格温度随着延迟时间的增加不断上升。这些理论分析对实际飞秒激光加工血管支架有重要的指导意义。
[Abstract]:In order to study the characteristics of femtosecond pulsed laser ablation of vascular scaffolds, the temperature field distribution of femtosecond laser ablated NiTi alloy was numerically simulated using a two-temperature model considering the heat conduction between electrons. The variations of electron temperature and lattice temperature with time and ablation depth are obtained, and the different laser energy density and laser pulse width are discussed. The effect of different delay time on the temperature field of electron and lattice. It is found that the temperature of electron absorption energy increases rapidly under the action of femtosecond laser, and then the energy is transferred to the lattice by electro-acoustic coupling. The laser energy density mainly affects the peak temperature of the electron and the equilibrium temperature between the electron and the lattice, and the pulse width mainly affects the peak temperature of the electron and the time taken to reach the peak temperature. The electron temperature first increases and then decreases with the increase of delay time, and the lattice temperature increases with the increase of delay time. These theoretical analyses are of great significance for the practical femtosecond laser fabrication of vascular stents.
【作者单位】： 山东理工大学机械工程学院;
【基金】：国家自然科学基金项目(61303006) 山东省优秀中青年科学家科研奖励基金项目(BS2012ZZ009)
【分类号】：TN249
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本文编号：1687988