A recent study by researchers at Germany's Innovent Institute has found that plasma and flame pretreatment methods can significantly increase the strength of thermoset carbon fiber composites, with improvements of up to 45% in bond strength.
The research investigated the effect of plasma or flame pretreatment on the bonding of carbon fiber composites. The results showed that pure atmospheric pressure plasma or flame treatment improved the adhesion of bonded carbon fiber composite parts by approximately 45%. This treatment resulted in only cohesive fractures in the adhesive and provided a more homogeneous bond.
Interestingly, the study found no correlation between increased surface energy and improved adhesion. Instead, the researchers found that tensile shear strength was directly related to the oxygen content on the surface of the pretreated carbon fiber composites.
Traditional methods for achieving strong bonds in fiber-reinforced plastics typically involve chemical treatments, mechanical roughening, or peel layers. The dry, gas phase based pretreatment methods such as atmospheric plasma or various flame techniques offer a viable alternative to these conventional approaches.
This advancement in pretreatment technology could revolutionize industries that rely on carbon fiber composites by providing a more efficient and effective bonding solution that improves material performance while potentially reducing production costs and environmental impact.
