Abstract
A gradient transition HA/TiN/Ti composite coating was deposited on the surface of medical Ti6Al4V alloy using the reactive magnetron sputtering technique. The influence of deposition parameters on the microstructure, mechanical properties, corrosion resistance, and in vitro mineralisation of the coating were systematically investigated. The results demonstrated that deposition parameters such as sputtering power, bias voltage, and sputtering pressure had a significant impact on the microstructure and morphology of HA/TiN/Ti composite coatings. The gradient TiN/Ti transition layer remarkably enhanced the adhesion strength, increasing the critical load from 7.5 N (HA monolayer) to over 40 N (HA/TiN/Ti multilayer). Moreover, compared to single TiN/Ti and HA coatings, the HA/TiN/Ti composite coatings exhibited better corrosion resistance and metal ion shielding ability while also demonstrating excellent capability for inducing bone-like apatite formation, thereby greatly ensuring the exceptional stability of the surface bioactive coatings.
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