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<p>Bioactive coating materials used on the surgical grades must be optimized to enhance the biocompatibility and strength of the implant. In the present work, three hydroxyapatite (HA)-based coatings were coated on SS 254 grade of medical steel by using the low-velocity oxy-fuel (LVOF) thermal spray technique. The pure hydroxyapatite (HA), HA + 10 wt% micrometric Al<sub>2</sub>O<sub>3</sub> (HALM), and HA + 10 wt% nanometric Al<sub>2</sub>O<sub>3</sub> (HALN) were used as a coating material. Pure hydroxyapatite (HA) undergoes thermal decomposition, thereby forming tetra-calcium phosphate (TTCP), tri-calcium phosphate (TCP), and amorphous calcium phosphate (ACP) during the deposition process. The addition of micrometric Al<sub>2</sub>O<sub>3</sub> in the HA enhances the thermal stability of the coating during deposition, preventing the decomposition of HA into undesired phases. Further, the addition of Al<sub>2</sub>O<sub>3</sub> has shown reduced porosity and increased coatings hardness, which ensures better mechanical performance and longevity in terms of biocompatibility. The addition of nano- Al<sub>2</sub>O<sub>3</sub> has enhanced the hardness of the HALN coating. Among the all deposited coatings, HA demonstrates the highest biocompatibility and HALN has the highest impedance, reflecting better barrier properties as a result of the nanometric Al<sub>2</sub>O<sub>3</sub> reinforcement observed during corrosion test, which improves microstructural homogeneity and minimizes defect pathways for electrolyte penetration<b>.</b></p>

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Bioactivity and Corrosion Performance of Low-Velocity Oxy-Fuel-Sprayed Hydroxyapatite-Based Coatings on a Surgical-Grade Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年7月6日

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  • Praveen Kumar Verma,
  • Hitesh Vasudev,
  • Vinod Kumar

摘要

Bioactive coating materials used on the surgical grades must be optimized to enhance the biocompatibility and strength of the implant. In the present work, three hydroxyapatite (HA)-based coatings were coated on SS 254 grade of medical steel by using the low-velocity oxy-fuel (LVOF) thermal spray technique. The pure hydroxyapatite (HA), HA + 10 wt% micrometric Al2O3 (HALM), and HA + 10 wt% nanometric Al2O3 (HALN) were used as a coating material. Pure hydroxyapatite (HA) undergoes thermal decomposition, thereby forming tetra-calcium phosphate (TTCP), tri-calcium phosphate (TCP), and amorphous calcium phosphate (ACP) during the deposition process. The addition of micrometric Al2O3 in the HA enhances the thermal stability of the coating during deposition, preventing the decomposition of HA into undesired phases. Further, the addition of Al2O3 has shown reduced porosity and increased coatings hardness, which ensures better mechanical performance and longevity in terms of biocompatibility. The addition of nano- Al2O3 has enhanced the hardness of the HALN coating. Among the all deposited coatings, HA demonstrates the highest biocompatibility and HALN has the highest impedance, reflecting better barrier properties as a result of the nanometric Al2O3 reinforcement observed during corrosion test, which improves microstructural homogeneity and minimizes defect pathways for electrolyte penetration.