Magnetically-Assisted Laser-Induced Plasma Micro-Machining for Flexible and Fast Texturing of Functional Surfaces

用于功能表面灵活快速纹理化的磁辅助激光诱导等离子体微加工

• 批准号: 1563244
• 负责人: Kornel Ehmann
• 金额: $ 30万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-01 至 2021-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1563244&HistoricalAwards=false
• 关键词: Magnetically; Assisted; Laser; Induced; Plasma; Magnetically; Assisted; Laser; Induced; Plasma

Challenges in the energy, environmental, and health sectors present a growing need for flexible and scalable micro-machining processes for applications such as textured surfaces for tissue adhesion and anti-bio-fouling, reduced wear in tooling and engine systems, and functional surfaces for biomedical devices such as needles and implants. This award funds research on a novel micro-machining process that addresses several existing challenges, namely limitations in the machinability of materials, patterning large areas at economically feasible material removal rates, and generating micro-features of different sizes and shapes. A fully realized magnetically-assisted laser induced plasma micro-machining process will be capable of fast and direct generation of micro-features with controlled geometrical characteristics.In magnetically-assisted laser-induced plasma micro-machining, picosecond laser pulses induce a plasma plume within a liquid dielectric. The plasma plume removes material from the workpiece surface by a combination of thermal vaporization and mechanical erosion to create machined features with desired geometry. This project aims to advance processing capabilities in terms of machining rate and precision by utilizing the external magnetic field's influence on the plasma plume through two mechanisms: (1) by increasing its energy density, leading to increased material removal rates; and (2) by modifying its shape, leading to the nearly direct creation of desired micro-feature geometries. The research objective is to understand the interaction between the electromagnetic and thermo-mechanical mechanisms of the process, i.e., interactions between the laser, dielectric, plasma, magnetic field and workpiece material. Methods to achieve this objective include simulations using magneto-hydrodynamic, particle-in-cell and finite element analysis methods to determine the outcomes of each interaction. Experiments with a wide variety of materials, including titanium alloys, silicon, polymers, and transparent, brittle and reflective materials such as glass, will be conducted using a picosecond laser system with a 532 nm wavelength, a computer-controlled array of electromagnets, and focus variation-based metrology. Experimental results will be compared with simulation results in terms of the depth and shape of the generated features and material removal rate.

能源，环境和卫生部门的挑战表明，对应用程序粘附和抗生物混战等应用的灵活和可扩展的微型实现过程的需求越来越大，工具和发动机系统中的磨损降低，以及用于生物医学设备的功能表面。该奖项为一个新的微型安排过程提供了研究，该过程解决了现有的几个挑战，即材料的可加工性，以经济上可行的材料去除率的大面积构图，并产生不同尺寸和形状的微功能。 完全实现的磁辅助激光诱导的等离子微型缓解过程将能够快速，直接生成具有控制的几何特性的微功能。在磁性激光诱导的等离子体微观缓解型的picosecond，picosecond，picosecond激光脉冲诱导液体液位液体液体脉冲。血浆羽流通过热蒸发和机械侵蚀的组合从工件表面中去除材料，从而创建具有所需几何形状的加工特征。该项目的目的是通过通过两种机制利用外部磁场对等离子体羽流的影响来提高加工能力，并通过提高其能量密度，从而提高材料去除速率； （2）修改其形状，从而导致几乎直接产生所需的微功能几何形状。研究目标是了解该过程的电磁和热机械机制之间的相互作用，即激光，介电，等离子体，磁场和工件材料之间的相互作用。实现此目标的方法包括使用磁性流动力，粒子中的粒子和有限元分析方法来确定每种相互作用的结果。将使用具有532 nm波长，计算机控制的电磁阵列以及基于焦点的基于焦点的元素进行实验，包括钛合金，硅，聚合物以及透明和反射材料（例如玻璃）的各种材料的实验。实验结果将与模拟结果进行比较，从生成的特征和材料去除速率的深度和形状方面进行比较。