Preparation And Bioactivity Of Ti/TiO₂/HA Composite Biomaterial

The metal materials have been used widly in oral and orthopedics because of the excellent mechanical properties. Titanium has better biocompatibility and corrosion resistance ability comparing to other metals. It is surface active, and will not beget ill feedback with bone. The maximal virtue of hydroxyapatite (HA) is it's excellent bioactivity. But it is confined in replacement of hard tissue because of the low strength and toughness. Titanium based HA composite material shows important value in research.The effect of the parameteres of microarc-oxidation (MAO) and hydrothermal synthesis (HS) on the titamnium oxide film, the bioactivity of the composite materials in the stimulated body fluid (SBF), were studied in this paper. The test results showed: The pure titanium was changed into Ti/TiO₂/HA composite whose synthetical mechanical properties are equivalent to pure titanium's and the bioactivity is super than titanium's after modified by MAO and HS. Treated titanium with MAO in electrolyte containing Ca and P not only gets the high active porous titanium oxide, but also puts the Ca and P into the oxide. The morphology, the crystal type and the quantity of the Ca and P in the titanium oxide film can be changed by the voltage, the current, and the electrolyte. Different medium, temperature and disposed time affect the morphology, the quantity and the rime extent of the HA. Along with the rising of the voltage, the augment of the current and the Ca concentration, the apertures in the films get bigger, the rutile, the contents of Ca and P, and the ratio of Ca to P increase, the HA diffracted intensity becomes stronger. HS in the medium of deionized water gets clubbed crystal, while in the ammonia gets granular crystal. Along with the rising of the temperature and the prolonging of the disposed time, the HA diffracted intensity becomes stronger, the quantity increases and the crystals largen. Disposed in the ammonia gets more symmetrical and more finer HA than in the deionized water. Titanium induces HA forming in the SBF after treated with MAO or MAO-HS. But the MAO-HS samples get HA faster than pure MAO treated samples. Sample after low voltage treated deposits HA as well as high voltage treated.MAO combines with HS can activate the titanium surface to get excellent bioactivity.