研究目的
To compare the micro-manufacturing capabilities of direct laser ablation and Laser-Induced Plasma Micro-Machining (LIPMM) in fabricating micro-channels in Ti-6Al-4V, a difficult-to-machine material.
研究成果
LIPMM yielded aspect ratios as high as 8, significantly higher than those achieved with direct laser ablation. However, increasing the number of laser passes in LIPMM does not indefinitely increase the aspect ratio due to limitations in plasma penetration depth.
研究不足
The depth of plasma penetration into the channel is limited even when the number of laser passes is increased. The use of external magnetic fields to 'squeeze' plasma to drive it deeper into the channels was suggested for future work.
1：Experimental Design and Method Selection:
The study compares two laser-based micro-machining processes: direct laser ablation and LIPMM.
2：Sample Selection and Data Sources:
Ti-6Al-4V substrates were used.
3：List of Experimental Equipment and Materials:
An Nd-YVO4 pulsed laser system, distilled water as dielectric, and a 5 degrees-of-freedom high-precision Aerotech motion stage.
4：Experimental Procedures and Operational Workflow:
Channels were machined by translating the workpiece at given feed rates, varying the pulse repetition rate and the number of laser passes.
5：Data Analysis Methods:
The 3D images of the channels were taken, and their width and depth measured using an Olympus Confocal laser scanning microscope.
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