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Pin-Shaped Surface Structures Generated by Laser Single Pulse Drilling for High-Strength Interfaces in Thermally
Erik Saborowski1, Philipp Steinert2, Thomas Lindner1
1Materials and Surface Engineering Group, Faculty of Mechanical Engineering, Chemnitz University of Technology, D-09107 Chemnitz, Germany.
Materials (Basel, Switzerland)
|January 21, 2023
Summary
New laser surface structuring using pulse drilling creates high-strength polymer-metal bonds faster than traditional cone-like structures. This method significantly reduces processing time while maintaining excellent adhesion for metal-polymer hybrids.
Area of Science:
- Materials Science
- Surface Engineering
- Additive Manufacturing
Background:
- Laser structuring is crucial for enhancing adhesion in polymer-metal hybrid materials.
- Cone-like protrusions offer superior wetting and strength but suffer from long processing times.
Purpose of the Study:
- To evaluate a novel laser pulse drilling strategy for creating pin structures on aluminum alloy surfaces.
- To compare the performance of these pin structures against traditional cone-like structures regarding processing efficiency and bond strength.
Main Methods:
- Utilized an Nd/YVO4 nanosecond laser system for single pulse drilling on EN AW-6082 aluminum alloy.
- Fabricated polymer-metal joints using heat-conduction thermal joining with polyamide 6.
- Conducted torsion tests on butt-bonded hollow cylinders to assess shear strength and fracture behavior.
Main Results:
- Investigated ten pin structures with varying heights and two ablation diameters.
- Achieved high aspect ratio pin structures with shear strength comparable to cone-like protrusions.
- Demonstrated a 31-fold increase in processing rate compared to cone-like structures.
Conclusions:
- Laser pulse drilling offers a significantly faster and efficient method for surface structuring aluminum alloys for polymer-metal adhesion.
- Scalable pin structures present a viable alternative to cone-like protrusions, balancing high strength with reduced manufacturing time.
