Effect of photocatalysis on apatite formation on Ti-0.2Pd alloy when the metal is immersed in a physiological solution is investigated. The surface of Ti-0.2Pd was treated by a method of thermal oxidation at 400 and 600 °C in air. Immersion tests of Ti-0.2Pd pieces in a simulated body fluid (SBF containing 27 mM HCO₃⁻) at 37 °C for 14 days under ultraviolet (UV) irradiation and in dark environment were carried out. Glancing angle X-ray diffraction and Fourier transform infrared spectroscopy were used to examine the crystallinity and composition of the deposition. Two different morphologies of carbonated hydroxyapatite (HA) deposition: spherical flower shape and dot shape are found formed on the samples. Spherical flower-shaped HA has higher crystallinity and higher Ca/P ratios (1.2–1.4) which are related to the effect of photocatalysis. Dot shaped HA with lower crystallinity and lower Ca/P ratio (0.8–1.0) is found formed on most dark immersed pieces. This work suggests the UV irradiation causes the change of the morphology and crystallinity of HA but has no effect on the quantity of HA formed on Ti-0.2Pd. The chemical composition of the deposition produced on Ti-0.2Pd under UV lighting is closer to that of a crystallized HA compared to that formed in dark.

研究了将金属浸入生理溶液中后光催化作用对Ti-0.2Pd合金上磷灰石形成的影响。Ti-0.2Pd的表面通过在空气中于400和600°C下热氧化的方法进行处理。在模拟体液中的Ti-0.2Pd件（SBF含有27毫HCO浸渍试验₃ ^-）在37°C下在紫外线（UV）照射下和黑暗环境中进行14天。使用掠角X射线衍射和傅里叶变换红外光谱法检查沉积物的结晶度和组成。发现在样品上形成了两种不同形态的碳酸羟基磷灰石（HA）沉积：球形花状和点状。球形花状HA具有较高的结晶度和较高的Ca / P比（1.2-1.4），这与光催化作用有关。在大多数深色浸没的工件上形成了具有较低结晶度和较低Ca / P比（0.8-1.0）的点状HA。这项工作表明紫外线照射会引起HA的形态和结晶度的变化，但对在Ti-0.2Pd上形成的HA的量没有影响。