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Plasma and flame pretreatment can improve the adhesion of thermoset carbon fiber composites and increase composite strength by 45%
.
That's what researchers from Germany's Innovent Institute found in a scientific study
.
This study examined the effect of pretreatment with plasma or flame on the adhesion of carbon fiber composites
.
Studies have shown that pure atmospheric plasma or flame treatment results in improved adhesion of bonded carbon fiber composite parts by up to about 45%, with only cohesive fractures observed in the adhesive during treatment
.
Furthermore, the pretreatment ensures a more uniform bond
.
The study also showed that there was no correlation between the increase in surface energy and the improvement in adhesion
.
On the other hand, the researchers found that the tensile shear strength was directly related to the oxygen content on the surface of the pretreated carbon fiber composites
.
In design, especially in the connection of fiber-reinforced plastics, there are currently few ways to bypass adhesive technology
.
So far, components have often been pre-treated to achieve stable bonding - either by appropriate chemicals, mechanical roughening or the use of a release layer
.
Dry, gas-phase-based pretreatment methods, such as the use of atmospheric plasma or the application of various flame treatment techniques, are a sensible option for these methods
.
