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<p>Recent years have seen rapid adoption of laser powder bed fusion (L-PBF) for fabricating biomedical implants from commercially pure titanium (CP-Ti). In this study, fluorapatite (FA, Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>F<sub>2</sub>) nanopowder was mixed with CP-Ti at 1&#xa0;wt.% and 2&#xa0;wt.% to enhance in vitro bioactivity. The mixtures were processed via optimized L-PBF, yielding uniform FA distribution on Ti surfaces. Ti-1%FA samples were crack-free, whereas Ti-2%FA showed surface cracking and was excluded. Electrochemical tests indicated that Ti-1%FA exhibited lower corrosion rate (0.012&#xa0;mm/year) than CP-Ti (0.017&#xa0;mm/year), supported by higher open-circuit stability, charge transfer resistance, and double-layer capacitance. Ti-1%FA also showed a smaller contact angle (13.5°) than CP-Ti (43.5°), suggesting improved cell adhesion. After 28 days in simulated body fluid, Ti-1%FA developed dense apatite layers, unlike CP-Ti. These results demonstrate that Ti-FA composites produced by L-PBF can enhance corrosion resistance and osteoconductivity for biomedical implants.</p>

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Enhanced Corrosion Resistance and In Vitro Bioactivity of Titanium-Fluorapatite Composite Biomedical Implants Fabricated Using Laser Powder Bed Fusion

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Yi-Ju Li,
  • Mahmoud Z. Ibrahim,
  • Jia-Wei Lin,
  • Hong-Chuong Tran,
  • Ru-Li Lin,
  • Tsung-Yuan Kuo,
  • Chi-Sheng Chien,
  • Duc-Kien Huynh

摘要

Recent years have seen rapid adoption of laser powder bed fusion (L-PBF) for fabricating biomedical implants from commercially pure titanium (CP-Ti). In this study, fluorapatite (FA, Ca10(PO4)6F2) nanopowder was mixed with CP-Ti at 1 wt.% and 2 wt.% to enhance in vitro bioactivity. The mixtures were processed via optimized L-PBF, yielding uniform FA distribution on Ti surfaces. Ti-1%FA samples were crack-free, whereas Ti-2%FA showed surface cracking and was excluded. Electrochemical tests indicated that Ti-1%FA exhibited lower corrosion rate (0.012 mm/year) than CP-Ti (0.017 mm/year), supported by higher open-circuit stability, charge transfer resistance, and double-layer capacitance. Ti-1%FA also showed a smaller contact angle (13.5°) than CP-Ti (43.5°), suggesting improved cell adhesion. After 28 days in simulated body fluid, Ti-1%FA developed dense apatite layers, unlike CP-Ti. These results demonstrate that Ti-FA composites produced by L-PBF can enhance corrosion resistance and osteoconductivity for biomedical implants.