Characterization,wear behavior and biocompatibility of HA/Ti composite and functionally graded coatings deposited on Ti-6Al-4V substrate by mechanical coating technique
Characterization,wear behavior,and biocompatibility of hydroxyapatite(HA)/Ti composite coating and functionally graded coatings(FGCs)deposited on a Ti-6Al-4V substrate by a mechanical coating technique were compared.The composite coating was produced using the initial powder mixture of 50 wt.％Ti+50 wt.％HA,while the FGC was deposited by two separate layers containing 75 wt.％Ti+25 wt.％HA and 25 wt.％Ti+75 wt.％HA,respectively.The XRD results exhibited that no phase changed during the deposition process.Moreover,due to the presence of Ti particles in the primary powder mixtures,a continuous interface with a superior bond was formed between the coating and the substrate,especially in the samples coated by the FGCs.The wear test results of the non-graded composite coating showed a coefficient of friction(COF)of about 0.37 with an abrupt change at the interface,while the COF of the FGCs increased from 0.32 to 0.5 with a gentle change at the interface.The SEM images of the worn surfaces indicated the dominance of the abrasive wear mechanism.The biocompatibility evaluations revealed better cell attachment and proliferation of the FGC-coated samples.
mechanical coating techniquehydroxyapatiteTi-6Al-4V substratefunctionally graded coatingcoefficient of friction
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