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首页> 外文期刊>Acta biomaterialia >Influence of the microstructure and topography on the barrier properties of oxide scales generated on blasted Ti6Al4V surfaces.
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Influence of the microstructure and topography on the barrier properties of oxide scales generated on blasted Ti6Al4V surfaces.

机译：微观结构和形貌对喷砂Ti6Al4V表面产生的氧化皮的阻挡性能的影响。

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The long-term interfacial bond between an implant and bone may be improved by creating a rough surface on the implant in order to increase the surface area available for bone/implant apposition. A natural consequence of surface roughening is an increase in metal ion release, which is itself a surface dominated process. Based on this fact, the aim of this work is to study the influence of the microstructure and topography on the barrier properties of oxide scales thermally generated at 700 degrees C for 1h on Ti6Al4V surfaces after blasting with Al(2)O(3) particles (coarse) or SiO(2) and ZrO(2) particles (fine). The microstructural and topographical characterization of the thermally treated blasted surfaces has been studied by means of scanning electron microscopy coupled with energy dispersive X-ray analysis, contact profilometry and X-ray diffraction. The barrier properties and corrosion behaviour of the oxide layers have been studied by means of electrochemical impedance spectroscopy (EIS) in Hank's solution. Thermal treatment at 700 degrees C for 1h promotes the formation of oxide scales with different morphologies and crystalline structures depending on the degree of deformation of the blasted surface. The oxide scale grown on the finely blasted sample has a pine needle-like morphology which is mainly formed of anatase TiO(2). In contrast, the oxide scale grown on the coarsely blasted sample has a globular morphology formed mainly of rutile TiO(2). The differences in morphology, i.e. fine or coarse, of the oxide scales influence the corrosion response of the blasted thermally treated samples in Hank's solution. The EIS results permit evaluation of the different oxide scales from the capacitance and resistance values obtained in the high-frequency region and show a good correlation between the morphology and barrier properties. Oxidation treatment at 700 degrees C for 1h of Ti6Al4V samples coarsely blasted with Al(2)O(3) improves the corrosion behaviour due to an increase in the thickness of a compact, ordered and more structurally stable oxide scale. This is due to the globular morphology of the rutile (TiO(2)) structure maintaining an average surface roughness suitable for optimal osseo-integration with long-term interfacial bonding between the implant and bone.
机译：可通过在植入物上形成粗糙表面来改善植入物与骨骼之间的长期界面结合，以增加可用于骨骼/植入物并置的表面积。表面粗糙化的自然结果是金属离子释放量的增加，而金属离子释放量本身就是一个以表面为主的过程。基于这一事实，这项工作的目的是研究微观结构和形貌对在用Al（2）O（3）粒子喷砂处理后在700摄氏度下热生成Ti6Al4V表面1h的氧化皮的阻挡性能的影响。 （粗）或SiO（2）和ZrO（2）颗粒（细）。热处理过的喷砂表面的微观结构和形貌特征已通过扫描电子显微镜与能量色散X射线分析，接触轮廓测量和X射线衍射相结合的方法进行了研究。已经通过在汉克溶液中的电化学阻抗谱（EIS）研究了氧化物层的阻挡性能和腐蚀行为。根据喷砂表面的变形程度，在700摄氏度下热处理1小时可促进形成具有不同形态和晶体结构的氧化皮。生长在细喷砂样品上的氧化皮具有松针状形态，主要由锐钛矿型TiO（2）形成。相反，在粗喷砂样品上生长的氧化皮具有主要由金红石型TiO（2）形成的球形形态。氧化物鳞片的形态上的差异，即精细或粗糙，会影响经喷砂热处理的样品在汉克溶液中的腐蚀响应。 EIS结果允许根据在高频区域获得的电容和电阻值评估不同的氧化皮，并显示出形态学和势垒性能之间的良好相关性。通过在700摄氏度下用Al（2）O（3）粗喷的Ti6Al4V样品进行1h的氧化处理，由于增加了致密，有序且在结构上更稳定的氧化皮的厚度，从而改善了腐蚀行为。这是由于金红石（TiO（2））结构的球状形态保持了平均表面粗糙度，该平均粗糙度适合于最佳的骨结合以及植入物与骨骼之间的长期界面结合。

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