Plasmatool at Roding Automobile – passion unites
Adhesive users are increasingly confronted with the need to realize mixed bonding of plas-tics and metals. A typical example is the bonding of CFRP (carbon fiber reinforced plastics) with aluminum or titanium materials in the automotive industry. However, adhesion prob-lems frequently occur on the surface of the CFRP material, which manifest themselves in adhesive failure under load.
The Plasmatool from Relyon Plasma GmbH, based in Regensburg, is a highly efficient plasma hand tool for flexible and simple surface treatment. The range of applications extends from prototype construction to series production. The Roding Automobile GmbH offers a good exa-mple for the application possibilities.The Plasmatool in use at Roding Automobile
Roding Automobile GmbH is an internationally active technology company in the field of light-weight construction and electromobility. As a technology company specializing in the develo-pment and production of lightweight CFRP structures for the automotive and aviation indust-ries, it is particularly important for Roding Automobile to deal with the latest manufacturing processes. A core competence of Roding Automobile GmbH is the use of modern composite materials such as CFRP. Surface tension and the associated wettability of the material play an important role, especially in the areas of bonding and laminating.
Using the Plasmatool, a highly efficient plasma hand tool for surface treatment, these para-meters can be optimized quickly and easily. An atmospheric pressure plasma is applied to the workpiece so that the surface is freed of fine impurities and chemically modified. This ensures optimum preparation for subsequent processes such as gluing or laminating.
After plasma treatment, inserts made of various materials, like aluminium or titanium, with significantly improved mechanical properties can be incorporated into the laminate. Thermo-plastics that would have been impossible to bond before due to their low surface energy can also be processed.The effect of plasma on CFRP surfaces
With the high-performance plasma system, metal surfaces can be freed from organic and oxidic impurities and thus optimally prepared for bonding. The CFRP surface is saturated with oxygen groups, which leads to tensile shear strengths of more than 20 MPa after bonding. The poor bondability of CFRP is also reflected in the low surface energy of the material, typically less than 45 mN/m. By plasma treatment this value can be increased to 72 mN/m (complete wettability with water).
The Plasmatool impresses with its flexibility, versatility and simple handling. Similarly good results in surface activation can also be achieved with the handy Piezobrush PZ2 in combina-tion with the Nearfield nozzle on CFRP surfaces, an ideal alternative for small series and pro-totypes.