Speaker
Description
Surface improvement of stainless steel (AISI 316L) by coating films for biomedical application was investigated. The DLC, TiN and TiCN films were deposited using Physical Vapor Deposition (PVD) technique. The structure of DLC film was analyzed using Raman spectroscopy. The composition of the films was measured using energy dispersive X-ray spectroscopy. The contact angle of the films was measured using contact angle measurement. The adhesive strength between the film and substrate was measured using scratch tester. The corrosion performance of the films was conducted using potentiodynamic polarization. The cell viability on the films was conducted using cytotoxicity test. The results indicate that the films show lower contact angle (80.75° to 87.79°) than un-coated AISI 316 L sample (96.63°), the tendency of wettability and hydrophilicity. This is due to the high surface roughness of films affecting the low contact angle. The TiCN, DLC and TiN films showed a corrosion potential values of -0.353 V, -0.58 V and -0.68 V, respectively, which show that the good corrosion resistance. This is due to the formation of a passive film and the sp3 sites structure of DLC film. The DLC film showed highest cell viability percentage of 104%, which show that the good biocompatibility properties.
