Composite materials made of glass or carbon fibers are characterized by their low specific weight and outstanding mechanical characteristics. Fiber-reinforced components are already being successfully processed today in industrial mass production. Although the material does have limitations regarding the manufacturing processes that can be used, these can be overcome through the clever use of laser processes.
Having been prevalent in the aerospace industry for many years, fiber-reinforced materials are now being successfully used in numerous other sectors such as automotive construction, medical engineering, and building construction. As a result, the demand for materials and processing methods is also growing fast.
The high-quality mechanical characteristics of fiber-reinforced components stem from a load-adapted composition of polymermatrix and fibers. In order to remove the matrix material close to the surface, the Fraunhofer Institute for Laser Technology ILT developed a method that allows the outer layers of the surrounding polymer matrix to be removed without damaging the underlying fibers.
Exposing carbon-fiber components
Using ultrashort pulsed laser radiation, the matrixmaterial– which usually consists of epoxy resin – can be processed with local and depth-selective ablation and can even be removed completely. An adapted process control allows the surface to be processed in such a way that the adjacent fibers do not suffer any damage.
“This is achieved through a local and selective adjustment of laser power and beam guidance,” explains Christian Hördemann, scientist at Fraunhofer ILT. »As a result, even complex geometries and 3D components can be processed with the laser.« This ability to process surfaces without disturbing the load-oriented processed fibers is especially interesting for the aerospace industry.
Joining heterogeneous components and metalizing plastic components using environmental friendly methods
A possible field of application for the new method is in preparing a solid joint between composite materials and adjacent components. In a subsequent step, heterogeneous plastics can be sprayed directly onto the exposed fiber structure, whereby they surround the fibers and can be mated in a form-closed joint.
Moreover, the method is also suitable for subsequent work steps using adhesion. For certain applications, CFRP and other plastic components must be coated with conductive layers. Working together with Fraunhofer IST, Fraunhofer ILT developed the method so that plastic components can be supplied with a well-bonded copper layer without using toxic Cr(VI) chemicals. Also a direct metallization is possible. The method is used for highly loaded antenna bodies as well as for chrome plating of decorative lightweight components.
Dipl.-Ing. Christian Hördemann
Phone +49 241 8906-8013
Fax +49 241 8906-121
Dr.-Ing. Arnold Gillner
Phone +49 241 8906-148
Fraunhofer Institute for Laser Technology ILT
Petra Nolis | Fraunhofer-Institut für Lasertechnik ILT
Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern
20.07.2018 | Princeton University
Relax, just break it
20.07.2018 | DOE/Argonne National Laboratory
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences