Effect of Magnetron Sputtering Duration on Properties of Composite Hydroxyapatite Coating
The composite hydroxyapatite(HA,Ca10(PO4)6(OH)2)coating was deposited on Ti-6Al-4V substrate by RF magnetron sputtering.The effects of sputtering duration on the microstructure,friction coefficient,calcium phosphorus ratio and electrochemistry properties of the composite HA coating were studied.The results show that with the increase of the sputtering duration,the hemispherical granular crystals on the surface of the composite HA coating are more obvious,which has an important impact on cell adhesion,growth and biocompatibility.The composite coating is mainly composed of HA phase,Ti phase and TiN phase.In addition,the Ca/P ratio is more and more close to the standard value of the hydroxyapatite with an increase in sputtering duration.The friction coefficient tends to be stable and the friction wear of the coating gradually decreases with the increasing sputtering time.The coating with the longest sputtering duration obtains the lowest corrosion current density and the largest corrosion potential.
hydroxyapatiteRF magnetron sputteringCa/P ratiofriction and wearelectrochemistry
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