WEB Ablation behavior of fiber-reinforced plastic treated by pulsed lasersWednesday (23.09.2020) 10:10 - 10:25 F: Functional Materials, Surfaces, and Devices 2 Part of:
New composite materials such as fiber-reinforced plastic (FRP) have different challenges regarding production processes and applications compared to common metal components. This challenges include the inhomogeneous material structure (fibers and matrix) on the one side and in the lower mechanical and thermal properties (such as wear and temperature resistant) on the other side. Consequently, established processes for metals need to be adapted or replaced by advanced surface treatments suitable for FRP modification.
Laser ablation offers a promising solution to overcome the challenge of joining metal and plastic. Especially short and ultra-short pulsed lasers offer a contact-free and clean surface pre-treatment on fiber-reinforced plastics that can be utilized to reach that goal.
This work demonstrates laser pre-treatment of carbon fiber-reinforced plastic (CFRP) with the aim to significantly improved adhesive strength of a metal coating applied by thermal spraying. In particular, the interaction of laser beams with different characteristics with the thermal sensitive CFRP is investigated using laser sources with pulse durations from microsecond (14 µs) to picosecond (11 ps) and wavelengths from 355 nm to 10.600 nm. Using spectroscopy analyses, the optical properties of the CFRP material as well as of the single materials (epoxy and carbon fibers) are determined, with the aim of understanding their interaction with the laser radiation. Furthermore, the threshold wavelength-dependent fluences of CFRP are experimentally obtained. The treated materials are characterized using optical and scanning electron microscopy methods. Additionally, high-speed imaging of the laser treatment are used for a better understanding of the ablation process.