Surface Sulfonation Modification and Surface Metallization of PEEK Materials

Beijing Spacecrafts, Beijing 100094

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    In order to meet the conductive, welding and other functional properties of poly-ether-ether ketone (PEEK) used in radar antenna, multi-chip modules and other products, PEEK with high chemical inertia was modified by sulfuric acid sulfonation, and Ni-P alloy metal layer was deposited to realize the surface metallization of PEEK material. The modified PEEK and metal coatings were characterized by SEM, laser scanning confocal microscope, and contact angle tester, respectively.The results show that the surface of PEEK modified by sulfuric acid presents three-dimensional sieve network pore structure. The pore structure becomes more regular with the increase of sulfuric acid etching time. After sulfuric acid modification, there is improved surface roughness of the substrate and the enhanced hydrophilicity.During electroless nickel plating, Ni-P nucleation crystallizes in three-dimensional network pores firstly, then with the extension of time, the crystal nucleus grow to the whole surface in two dimensions, and finally grow into three-dimensional cauliflower shape. The bonding strength between the metal layer and the substrate becomes superior with the increase of sulfonation time, where the drag strength of solder joint increases from 3.2 MPa to 7.1 MPa. In this study, the sulfonation modification of PEEK surface and the preparation of conductive metal layer has been realized, which provides technical support for its application in radar antenna and other fields.

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  • Received:April 27,2021
  • Revised:September 14,2021
  • Adopted:June 29,2021
  • Online: January 13,2022
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