Influence of the morphology of nanoporous silicon dioxide based surface coatings on the interfacial strength of injection-moulded polymer-metal hybridsTuesday (28.04.2020) 14:40 - 15:00 Room 2
Plastic-metal hybrids already belong to the state of the art, as components can be designed to meet high demands thanks to the material combination. Especially injection moulded thermoplastic metal hybrids enable functional integration and economical manufacturing. One possibility to produce hybrids is the in-mould assembly using injection moulding. Due to short contact time, pre-treatment of the metal surface is necessary to ensure sufficient bonding to the overmoulded plastic component. Toxic pre-treatment methods such as pickling or priming are hardly used anymore because of ever stricter environmental conditions. It was found that nanoporous silicon dioxide based surface structures can offer an alternative to generate high bonding strengths. The structures are coated on the metal surface in a microwave induced PECVD process. During injection moulding, the surface structure is infiltrated by the polymer, so that the solidification of the melt produces a form closure. Within these investigations the influence of different coating morphologies on both the interfacial tensile strength and compression shear strength were investigated using injection moulded PPS metal hybrids. Average adhesive tensile strength of 28 MPa and low scattering have been achieved as well as average compression shear strengths of 30 MPa. It could be shown that the coating structure has a significant influence on the interfacial strength of the injection moulded hybrids.