本文選題：飛秒激光　切入點(diǎn)：鎳鈦合金　出處：《中國(guó)材料進(jìn)展》2017年03期

【摘要】：為了研究飛秒脈沖激光燒蝕血管支架材料的特性,利用考慮了電子之間熱傳導(dǎo)項(xiàng)的雙溫模型,采用有限差分法,對(duì)飛秒激光燒蝕NiTi合金的溫度場(chǎng)分布進(jìn)行數(shù)值模擬,計(jì)算得到了電子溫度和晶格溫度隨時(shí)間和燒蝕深度的變化規(guī)律,進(jìn)一步討論了不同激光能量密度、不同激光脈寬、不同延遲時(shí)間對(duì)電子和晶格的溫度場(chǎng)影響。發(fā)現(xiàn)血管支架材料在飛秒激光的作用下,先是電子吸收能量溫度快速升高,再通過(guò)電聲耦合作用將能量傳遞給晶格,最后兩者的溫度達(dá)到一個(gè)平衡狀態(tài);激光能量密度主要影響電子的峰值溫度和電子與晶格的平衡溫度;脈沖寬度主要影響電子的峰值溫度和達(dá)到峰值溫度所用的時(shí)間;電子溫度隨著延遲時(shí)間的增加先升高后降低,晶格溫度隨著延遲時(shí)間的增加不斷上升。這些理論分析對(duì)實(shí)際飛秒激光加工血管支架有重要的指導(dǎo)意義。
[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.
【作者單位】： 山東理工大學(xué)機(jī)械工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(61303006) 山東省優(yōu)秀中青年科學(xué)家科研獎(jiǎng)勵(lì)基金項(xiàng)目(BS2012ZZ009)
【分類號(hào)】：TN249
，

本文編號(hào)：1687988