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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (2): 624620.doi: 10.7527/S1000-6893.2020.24620

• Special Topic of Advanced Aeronautical Materials Welding/Joining • Previous Articles     Next Articles

Effect of laser textured dual-scale structure on microstructure and mechanical property of Al/CFRPEEK joint

XU Mengjia, LIU Bosheng, BI Xiaoyang, WANG Zhenmin   

  1. School of Mechanical & Automatic Engineering, South China University of Technology, Guangzhou 510641, China
  • Received:2020-08-10 Revised:2020-09-05 Published:2020-10-16
  • Supported by:
    National Natural Science Foundation of China (52075185, 51875212)

Abstract: Non-polarity of the PEEK matrix makes it difficult to directly join metal and the carbon-fiber-reinforced-PEEK by friction lap joining. Laser surface texturing is proposed to assist the friction lap joining of the carbon-fiber-reinforced-PEEK, which is a nonpolar thermoplastic matrix, and 6061-T6 aluminum alloy, significantly enhancing the bonding strength of the carbon-fiber-reinforced-PEEK/6061-T6 joints. Results show that the laser surface texturing produces the dual-scale hierarchical structure of micro-pores and nano-particles on 6061-T6 surfaces, thereby changing the wettability of the surfaces. The superhydrophobic surface of 6061-T6 exhibits higher adhesion property with the carbon-fiber-reinforced-PEEK than the hydrophobic surface does. A flawless interface is observed in the joint of the carbon-fiber-reinforced-PEEK and 6061-T6 with the superhydrophobic surface. The micromechanical interlocking caused by micro-pores and nano-particles on 6061-T6 surfaces explains the enhancement of the bonding strength between the carbon-fiber-reinforced-PEEK and 6061-T6.

Key words: carbon-fiber-reinforced-PEEK, laser surface texturing, superhydrophobic surface, aluminum alloy, friction lap joining

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