Selective processing of CFRP by two-color double-pulse femtosecond laser

Area of Science:

• Materials Science
• Laser Physics
• Surface Engineering

Background:

• Carbon fiber reinforced polymers (CFRP) are advanced composites with diverse applications.
• Surface preparation is critical for effective adhesive bonding of CFRP materials.
• Current surface treatment methods can be damaging or inefficient.

Purpose of the Study:

• To investigate the efficacy of two-color double-pulse femtosecond laser (TDFL) technology for CFRP surface modification.
• To optimize TDFL parameters for selective resin ablation.
• To evaluate the impact of laser treatment on surface properties and adhesive bonding.

Main Methods:

• Utilized a two-color double-pulse femtosecond laser system.
• Explored ablation thresholds of resin and carbon fiber at varying wavelengths and pulse numbers.
• Adjusted processing parameters, including pulse delay, for precise surface treatment.
• Analyzed changes in surface roughness and wettability post-laser treatment.

Main Results:

• Identified optimal wavelength combinations for selective resin ablation.
• Achieved precise removal of CFRP surface resin without damaging underlying carbon fibers.
• Demonstrated significant modifications in surface roughness and wettability.
• Showcased improved potential for adhesive bonding with binders or coatings.

Conclusions:

• TDFL technology offers a precise and non-damaging method for CFRP surface processing.
• Optimized laser parameters enable selective ablation of resin, enhancing surface properties.
• Laser-treated CFRP surfaces exhibit improved characteristics for subsequent adhesive applications.