Abstract
The increasing need for advanced orthopaedic implants necessitates improved materials that offer better biocompatibility and mechanical properties, addressing issues such as implant failure due to poor integration and corrosion. A 3″ diameter, 5-mm-thick pellet of hydroxyapatite (HAP) was prepared and was used as the cathode for the radio frequency (RF) magnetron sputtering system. One hundred nm nanocoating on alumina substrates (HAP/Al2O3) was done using RF magnetron sputtering. The hexagonal (HCP) HAP structure was chosen to deposit on hexagonal α-alumina for better growth and adhesion of the HAP film. The microstructure was analysed using field emission scanning electron microscopy, atomic force microscopy, and glancing angle X-ray diffraction. Elemental analysis was carried out using energy-dispersive X-ray spectroscopy. Mechanical and film adhesion properties were studied using Vicker’s hardness and scratch test, respectively. The hardness of the coated sample increases 2.5 times. The optical contact angle increased from 82.88° for pure alumina to 113.53° for HAP/Al2O3 due to the decreased roughness, indicating enhanced hydrophobicity. Pore size, area, and volume were studied using the Brunauer–Emmett–Teller technique. Corrosion resistance in Ringer’s solution and dielectric properties were investigated. The antimicrobial investigation was carried out against two different bacteria, namely gram-negative Escherichia coli (E. coli) and gram-positive Staphylococcus aureus (S. aureus). Improved adhesion, hardness, corrosion resistance, and biocompatibility properties are correlated with the surface and structural properties.
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The authors thank everyone at the Central Instrumentation Facility (CIF) at BIT Mesra, Ranchi, for supplying the data.
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The authors thank the Science and Engineering Research Board (File No— CRG/2021/002818), DST, Government of India, for providing the funds to carry out this research.
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Kumar, R., Shikha, D. & Sinha, S.K. Structural, mechanical, electrical, and biocompatibility investigation of nanostructured hydroxyapatite coating on alumina by radio frequency magnetron sputtering. J Mater Sci 59, 15764–15779 (2024). https://doi.org/10.1007/s10853-024-10132-6
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DOI: https://doi.org/10.1007/s10853-024-10132-6