Bulbul Ertuğrul, Aksakal Bunyamin
Faculty of Chemistry and Metallurgy, Department of Metallurgy and Materials Engineering, Yildiz Technical University, Istanbul, Turkey.
Acta Bioeng Biomech. 2017;19(4):171-180.
Laser-treated Ti6Al4V surfaces were coated by the single-layer hydroxyapatite (HA) and double-layer hydroxyapatite reinforced by the reduced nano-graphene oxide (rGO) using the sol-gel method. The effects of rGO reinforcement at different ratios and sintering temperatures on surface morphology and adhesion strength of the single and double layer coatings (rGO/HA) were analysed. As the initial treatment process, a laser texturing was patterned on the alloy and then, prepared samples were coated. The coated laser-modified HA and HA/rGO-coated Ti6Al4V surfaces were characterized by Raman spectroscopy, X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM) and the adhesion strength between the coat and substrates were determined by the standard adhesion tests. The conducted analyses indicated that the substitution of rGO into HA matrix revealed a homogeneous morphology and relatively crack-free coatings on the laser-treated Ti substrate surfaces. Adhesion tests showed that, the HA + rGO (1.0 wt. %) biocomposites exhibited a significant increase in adhesion strength compared to untreated surfaces and to the single HA-coated Ti6Al4V substrates.
采用溶胶-凝胶法，用单层羟基磷灰石（HA）和由还原氧化石墨烯（rGO）增强的双层羟基磷灰石对激光处理的Ti6Al4V表面进行涂层处理。分析了不同比例的rGO增强和烧结温度对单层和双层涂层（rGO/HA）表面形貌和粘附强度的影响。作为初始处理工艺，先在合金上进行激光纹理化处理，然后对制备的样品进行涂层处理。通过拉曼光谱、X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）对涂覆的激光改性HA和HA/rGO涂覆的Ti6Al4V表面进行表征，并通过标准粘附试验测定涂层与基底之间的粘附强度。进行的分析表明，将rGO引入HA基体后，在激光处理的Ti基体表面呈现出均匀的形貌和相对无裂纹的涂层。粘附试验表明，与未处理表面和单层HA涂覆的Ti6Al4V基底相比，HA + rGO（1.0 wt.%）生物复合材料的粘附强度显著提高。
