Konzeptionelle Untersuchung von Verfahren zur In-situ-Imprägnierung von kontinuierlichen Fasersträngen mit hochviskosen Thermoplastschmelzen für additive Extrusionsverfahren

Kurzfassung

Additive manufacturing has the potential to economically manufacture complex components in small series. Thermoplastic high-performance plastics in particular are attractive for use in aviation due to their chemical and thermal properties. Through reinforcement with continuous carbon fibers, it is also possible to significantly increase the mechanical properties so that composites can be produced for loadbearing applications. It is of fundamental importance for the quality of the composites that the fibers are completely impregnated by the highly viscous melt so that the force transmission between the fibers and the matrix is guaranteed. In an in-situ process, the fiber is impregnated immediately before extrusion. This leads to the dilemma that a lot of time is needed for a high-quality impregnation, but on the other hand the speed of the additive process should be as high as possible. This paper examines the question of which concepts for a fiber impregnation in an additive process are useful and which have already proven themselves. For example, the impregnation process, the use of different fiber types and the use of pre-impregnated rovings are considered. In particular, […] is identified as a promising process which has received little attention in research so far. For this reason, the working principle of […] will be developed and experimentally investigated in a near-application scenario.