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为了提高医用纯钛及其合金的早期成骨效果和长期稳定性,本研究通过化学转化方法分别在纯钛和Ti-6Al-4V基体表面制备了一层含锌、钙元素的磷酸盐转化膜。利用X射线衍射仪(XRD)、热场发射扫描电镜(FE-SEM)和电化学工作站对转化膜的成分、微观结构和电化学行为进行了表征。结果表明:纯钛和Ti-6Al-4V表面转化膜主要由片层结构的磷酸锌钙(scholzite)晶体组成,Ti-6Al-4V表面含少量磷酸锌(hopeite)晶体和磷酸氢钙(brushite)晶体。纯钛表面片层晶粒呈花簇状堆积,Ti-6Al-4V表面片层晶体呈交叉镶嵌堆积,分布更为均匀。通过电化学测试分析可知,在0.9%NaCl溶液中,转化膜的耐蚀性能与基体相比没有较大差异。
In order to improve the early osteogenesis and long-term stability of medical pure titanium and its alloys, a zinc and calcium phosphate conversion coating was prepared on the surface of pure titanium and Ti-6Al-4V by chemical conversion method . The composition, microstructure and electrochemical behavior of the conversion coating were characterized by X-ray diffraction (XRD), thermal field emission scanning electron microscope (FE-SEM) and electrochemical workstation. The results show that the pure titanium and the Ti-6Al-4V surface conversion coating mainly consist of lamellar scholzite crystals. The surface of Ti-6Al-4V contains a small amount of hopeite crystals and brushite, Crystal. The grains on the surface of pure titanium are clustered in flower clusters, and the crystals of Ti-6Al-4V surface layer are inlaid and stacked and distributed more evenly. Through the electrochemical test analysis shows that in 0.9% NaCl solution, the corrosion resistance of the conversion film compared with the substrate there is no significant difference.