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Manufacturing aluminum/polybutylene terephthalate direct joints by using hot water–treated aluminum via injection molding

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Abstract

Metal–polymer direct joining helps meeting the growing demand for lightweight design in industry. Injection molded direct joining (IMDJ) is one of the promising metal–polymer direct joining methods. It needs firstly metal surface treatment and then injection insert molding. In this study, we proposed a simple, economical, and eco-friendly surface treatment, named as hot water treatment (HWT) for IMDJ. HWT produces complexed plate-like nanostructures on the aluminum surface. Polymer can flow into nanostructures and produce a mechanical interlocking effect by which metal and polymer achieve direct joining. The HWT treatment conditions, including water temperature and treatment time, were optimized. With the optimized condition, the highest joining strength of 22.5 MPa was obtained. An atomic force microscope (AFM) investigation on nanostructures and tensile shear tests to the joined specimens proved that the joining strength was strongly correlated with the combination of the arithmetical mean height (Sa) and the number of nanostructures (Nn). In addition, the joined specimens also achieved high cycle fatigue. Results showed that high-quality joint can be produced by treating aluminum with HWT. Compared with conventional chemical surface treatment methods, HWT is much easier to apply in practices. Wide applications in industries can be expected.

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Acknowledgments

A part of this work was conducted at Advanced Characterization Nanotechnology Platform of the University of Tokyo, supported by “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

Funding

This work was supported by JSPS KAKENHI (19K14859) and Foundation for the Promotion of Industrial Science, Japan.

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Authors and Affiliations

  1. Precision Engineering Department, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan

    Shuaijie Zhao, Fuminobu Kimura & Yusuke Kajihara

  2. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan

    Fuminobu Kimura & Yusuke Kajihara

  3. SINTOKOGIO, LTD., 3-28-12 Mei-eki, Nakamura-ku, Nagoya, 450-6424, Japan

    Eiji Yamaguchi & Nayuta Horie

Authors
  1. Shuaijie Zhao
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  2. Fuminobu Kimura
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  3. Eiji Yamaguchi
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  4. Nayuta Horie
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  5. Yusuke Kajihara
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Correspondence to Shuaijie Zhao.

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Zhao, S., Kimura, F., Yamaguchi, E. et al. Manufacturing aluminum/polybutylene terephthalate direct joints by using hot water–treated aluminum via injection molding. Int J Adv Manuf Technol 107, 4637–4644 (2020). https://doi.org/10.1007/s00170-020-05364-0

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  • DOI: https://doi.org/10.1007/s00170-020-05364-0

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