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Metal Joining Technologyの製品一覧

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Tohoku University Technology: Technology for easy and strong resin/metal bonding: T19-064

Dry process, low cost, quick& simple joining technology!

Conventional technologies for joining metal and resin include mechanical fastening with rivets, bolts, nuts, etc. and adhesive bonding, but the former has problems such as poor airtightness and increased number and weight of parts in the bonding area, while the latter has low adhesive strength due to the lack of adhesives for thermoplastic resins and low reliability in long-term use.  The present invention relates to a technology for joining resin and metal simply, firmly, quickly, and at low cost, which differs from the above methods in that it is a dry process, does not require expensive equipment, and is not a wet process, thus eliminating the need for waste liquid treatment.

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Tohoku University Technology: Joining Solid Metals: T24-079

It can strongly bond phase-separated metals that could not be traditionally joined in metallurgy while maintaining the shape of the components.

The technology for joining dissimilar metals is expected to contribute to weight reduction of vehicles such as automobiles, trains, and aircraft, improving safety and speed performance, as well as reducing CO2 emissions through lightweighting. However, depending on the types of metals, poor compatibility between materials can lead to phase separation, making joining difficult. The inventors developed a method for joining incompatible metals, such as Fe and Mg, using the de-alloying method as described in Patent No. 6710707. By pre-diffusion bonding an Fe-Ni intermediate layer to the tip of the Fe, and then heating the Fe-Ni intermediate layer in contact with Mg, de-alloying occurred. Only Ni was de-alloyed from the intermediate layer to the Mg side, and Mg filled the gaps in the porous structure of Fe, resulting in a composite structure where Fe and Mg were intertwined at the joint interface, achieving a strong Fe-Mg mechanical bond. Additionally, by utilizing the decrease in melting temperature associated with the Mg-Ni alloy reaction, the joint interface could be liquefied while maintaining the shape of the joined materials, thus promoting de-alloying. At the same time, pressure was continuously applied to expel the alloy liquid, which becomes brittle upon solidification, to the outside.

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