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<p>Selective laser melting (SLM) has revolutionized the production of custom titanium components, enabling advanced designs for biomedical applications. However, the inherently poor surface quality of TiAl6V4 limits its use in critical applications such as titanium implants. Although various surface modification process has been conducted for TiAl6V4 manufactured by non-SLM, studies on the fabrication of uniform micro/nanostructure on TiAl6V4 manufactured by SLM are still lacking. In this study, we developed innovative surface modification method combining electrochemical polishing and wettability modification. This process successfully fabricated uniform micro/nanostructures that were previously unattainable for additive surface and enabled precise control of surface wettability. The wettability-modified surfaces were analyzed by contact angle and hysteresis. On the TiAl6V4 with micro/nanostructures, the water droplet spread on the surface. In contrast, superhydrophobic surface was measured to be over 160°. In addition, the sliding angle (9.6° ± 1.82°) and hysteresis (2.07° ± 1.25°) of SLIPS were significantly reduced compared to the superhydrophobic surface, indicating improved sliding properties. The characteristics of superhydrophilic and superhydrophobic surfaces were demonstrated through surface morphology analysis using SEM and observation of surface chemical composition using XPS. We highlight that it is possible to overcome the limitations associated with the inherent surface quality TiAl6V4 manufactured via SLM. By addressing these limitations, this study contributes biomedical applications and titanium implant industry. </p>

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Micro/nanostructure-Based Surface Modification After Electropolishing of TiAl6V4 Manufactured by Selective Laser Melting Process: Superhydrophilic, Superhydrophobic, SLIPS

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Eun-Jae Lee,
  • Kwang-Kyu Lee,
  • Dong-Gyu Ahn,
  • Jeong-Won Lee

摘要

Selective laser melting (SLM) has revolutionized the production of custom titanium components, enabling advanced designs for biomedical applications. However, the inherently poor surface quality of TiAl6V4 limits its use in critical applications such as titanium implants. Although various surface modification process has been conducted for TiAl6V4 manufactured by non-SLM, studies on the fabrication of uniform micro/nanostructure on TiAl6V4 manufactured by SLM are still lacking. In this study, we developed innovative surface modification method combining electrochemical polishing and wettability modification. This process successfully fabricated uniform micro/nanostructures that were previously unattainable for additive surface and enabled precise control of surface wettability. The wettability-modified surfaces were analyzed by contact angle and hysteresis. On the TiAl6V4 with micro/nanostructures, the water droplet spread on the surface. In contrast, superhydrophobic surface was measured to be over 160°. In addition, the sliding angle (9.6° ± 1.82°) and hysteresis (2.07° ± 1.25°) of SLIPS were significantly reduced compared to the superhydrophobic surface, indicating improved sliding properties. The characteristics of superhydrophilic and superhydrophobic surfaces were demonstrated through surface morphology analysis using SEM and observation of surface chemical composition using XPS. We highlight that it is possible to overcome the limitations associated with the inherent surface quality TiAl6V4 manufactured via SLM. By addressing these limitations, this study contributes biomedical applications and titanium implant industry.