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چکیده
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Titanium alloys like Ti6Al4V are a mainstay in medical implants, thanks to their strength and compatibility with the human body. Still, ensuring they last in the body’s harsh environment calls for advanced surface coatings. My research explores the nano-mechanical properties of three coatings—hydroxyapatite (HA), HA-selenium (HA-Se), and HA-selenium-collagen (HA-Se-Col)—applied to Ti6Al4V through electrochemical deposition. I looked at their hardness, toughness, and adhesion, alongside their microstructural features. The HA coating, riddled with 20–25% porosity, offered decent hardness but struggled with toughness due to its brittle, open structure, making it prone to cracking under stress. Adding selenium in HA-Se boosted hardness by tightening the crystallite structure, though adhesion to the alloy didn’t improve much. The standout was HA-Se-Col, where collagen worked wonders, cutting porosity to 8–10% and creating a dense, unified coating. Collagen’s hydrogen bonds with apatite strengthened the structure, spreading stress evenly and resisting cracks. Scanning electron microscopy revealed HA-Se-Col’s tight, flower-like texture, which backed its mechanical strength. These findings show how selenium and collagen team up to refine HA coatings, delivering tougher, harder, and better-bonded surfaces for implants. By enhancing these nano-mechanical traits, HA-Se-Col coatings pave the way for longer-lasting, body-friendly titanium implants, blending clever material design with practical biomedical solutions.
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