Abstract
In this paper, the effects of hydrothermal treatment temperature and time on the surface characteristics and bioactivity of MAO coating on Ti-6Al-4V alloy were systematically investigated. The results showed that the amount of HAP formation on MAO coating gradually increased with the increase of hydrothermal treatment temperature and time. However, excessive temperature and time will cause the HAP pulverization on the MAO coating and cover its pores, which will be detrimental to osseointegration. It was found that when the hydrothermal treatment temperature and time were 200 °C and 24 h, respectively, the formed HAP could not be pulverized off, but could completely cover the MAO coating and retain its porous structure. Further bioactivity testing in simulated body fluid (SBF) revealed that the hydrothermally treated MAO coating generated more HAP crystal structures and covered a wider area than the sample without hydrothermal treatment. In addition, HAP first forms granules to fill the coating surface during the growth process. Then, with time HAP gradually embeds inside the coating and starts a new round of generation and fusion.
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