紫外辐照诱导等离子体喷涂氧化钛涂层的生物活性

BIOACTIVITY OF PLASMA SPRAYED TITANIA COATING BY ULTRAVIOLET RADIATION INDUCTION

采用大气等离子体喷涂技术在钛合金表面上制备常规和纳米结构TiO2涂层。考察了TiO2涂层经紫外光辐照后浸泡于模拟体液(simulated body fluid,SBF)中的生物活性。研究涂层表面状态、紫外光辐照时间和辐照介质对TiO2涂层生物活性的影响。结果表明:经紫外光辐照后的纳米TiO2涂层在SBF中可诱导类骨磷灰石在其表面形成,显示了良好的生物活性,但常规TiO2涂层和磨去表面的纳米TiO2涂层无此种现象发生。紫外光辐照处理时间增长有利于类骨磷灰石的生成。在SBF、水、空气中进行紫外光辐照的纳米TiO2涂层表面均有类骨磷灰石生成,但在水中进行紫外光辐照处理的涂层显示较低的生物活性。

Conventional and nano structured TiO2 coatings on the titanium alloy surface were prepared by atmospheric plasma spraying technique. After ultraviolet light （UV） irradiation, the TiO2 coatings were soaked in simulated body fluid （SBF） to explore their bioactivities. The effects of the surface state of coatings, UV irradiation time and UV irradiation media on the bioactivities of TiO2 coatings were investigated. The results indicate that no bone-like apatite is formed on the surfaces of conventional and polished no.no TiO2 coatings irradiated with UV in SBF. But bone-like apatite can be formed on the surface of nano TiO2 coating irradiated by UV in SBF, and this reveals that the irradiated coating has good bioactivity. The amount of apatite formed on the surface of nano TiO2 coating increases with the increase of UV irradiation time. UV-irradiated media also influence the bioactivity of the coating. The bioacfivities ofnano TiO2 coatings irradiated in SBF and air are better than that in water.