熱可塑性樹脂と金属の摩擦攪拌接合における界面強化手法

抄録

With the increasing demand for weight reduction in the transportation industry, reliable joining technologies for thermoplastic resins, including CFRTP, to metallic materials have become increasingly important. This article reviews friction stir welding（FSW）of polymers to metals, focusing on interfacial bonding mechanisms and strengthening approaches. Unlike conventional FSW of metals, polymer–metal FSW does not require stirring of the metallic material. Joining is achieved using a probe-less tool, where frictional heat locally melts the thermoplastic resin at the interface, enabling bonding to the metal. At the interface, hydrogen bonding occurs between hydroxyl groups on the metal oxide layer and polar functional groups in the polymer. In addition, covalent bonding such as Al–O–C linkages has been reported, contributing to joint strength. Mechanical interlocking due to surface roughness also enhances bonding strength. Furthermore, silane coupling treatment promotes interfacial covalent bonding. High-strength and reliable joints can be achieved by combining these mechanisms based on localized melting. Polymer–metal FSW is therefore a promising method for dissimilar-material joining.