水热电沉积羟基磷灰石/Ti复合涂层的研究

Study on Hydrothermal Electrodeposition of Hydroxyapatite/Ti Composite Coatings

在水热电沉积羟基磷灰石(Hydroxyapatite,简称HA)涂层的电解液中加入Ti粉,制备了HA/Ti复合涂层,探讨了Ti粉的加入对涂层结合强度和生物活性的影响,并研究了涂层的热稳定性。结果表明,500℃焙烧2h后,HA/Ti复合涂层的结合强度为18.4MPa,明显高于纯HA涂层的11.2MPa;模拟体液浸泡7d后,涂层表层形成一层碳磷灰石。Ti粉的加入明显提高了涂层的结合强度,又不降低涂层的生物活性。500℃焙烧不改变涂层的相组成,焙烧温度高于600℃时,HA部分发生分解,Ti氧化为金红石TiO2,1000℃时,TiO2促进HA完全发生分解,但不影响涂层的结合强度随焙烧温度的升高而提高。

Hydroxyapatite (HA)/Ti composite coatings were successfully prepared on titanium electrode using a hydrothermal electrodeposition method via adding Ti powder in the electrolyte in an autoclave. The bonding strength, bioactivity and thermal stability of the coatings were investigated. The bonding strength of HAM composite coating was up to 18.4 MPa after calcination at 500 degreesC, obviously higher than that of pure HA coating. HA/Ti composite coating surface was covered by carbonate-apatite coating after immersion in simulate body fluid for 7 days, indicating that the Ti addition in HA coating improved greatly the bonding strength while not decreasing the bioactivity of the coating. Calcination at 500 degreesC had no effect on the phase composition of the coating. When calcination temperature was above 600 degreesC, HA was partially decomposed and Ti powder was oxidized to rutile TiO2. TiO2 promoted the HA total decomposition when the calcination temperature was above 1000 degreesC. However, the bonding strength of the composite coating with temperature was not affected by this high temperature calcination.