Investigation of Electrochemical Modification and Preparation of Bioactive Composite Coating on Titanium Surface

钛及钛合金作为植入体材料具有优良的机械性能和生物相容性，但本身不具备生物活性，需要通过表面修饰改性使之具备诱导骨组织长入并与植入部位实现骨性结合的能力。目前已采用各种表面处理方法在钛及钛合金表面改性和制备生物活性陶瓷涂层。本文首先通过电化学阳极氧化工艺，在钛表面形成了具有多孔结构的陶瓷氧化膜，并结合XRD、SEM以及电化学交流阻抗等方法对其形貌、成分和结构进行了表征。在SBF中诱导沉积HAp，以期得到具有生物活性、可促进细胞的粘附和生长的表面形貌和结构。结果表明，经改性后的钛板较改性前在SBF中的耐蚀性均有不同程度提高，并具有较强的诱导沉积HAp能力。针对电化学方法制备的HAp涂层材料面临的涂...Titanium and its alloys have been widely used as orthopedic and dental implants for their superior mechanical properties and good biocompatibility. However, they have poor bioactivity. In order to achieve inducing growth of bone tissue and osteal combination when they are planted in vivo, titanium and its alloys need to decorate and modify. Nowadays, various techniques have been developed to modif...学位：工学硕士院系专业：化学化工学院材料科学与工程系_材料物理与化学学号：20033601

Preparation of Co-YSZ/HAp Nano-composite Coating on Ti Substrate by Electrochemical Method

采用复合电沉积和电泳沉积两步法在钛基体上制备了Co-YSZ/HAp纳米复合涂层,与只采用电泳沉积法在钛基体上制备纳米HAp单一涂层进行了比较研究.采用场发射扫描电镜、X射线衍射和能量散射谱对复合涂层的微观形貌,纳米HAp外层表面形貌,晶相,复合涂层的断面形貌及元素组成分布进行分析研究.通过粘结-拉伸实验测定了涂层与基体的结合强度,结果表明,Co-YSZ/HAp纳米复合涂层与钛基体的结合强度明显高于纳米HAp单一涂层与钛基体的结合强度,说明复合涂层具有更好的力学性能.Co-YSZ/HAp nano-composite coating and nano-HAp single coating were deposited on Ti substrate using the combination of electrocodeposition and electrophoretic deposition, and electrophoretic depositions, respectively. Surface and cross section morphologies of the coatings were observed by scanning electron microscope. Element distribution and crystal phase of the coatings were analyzed by energy dispersive spectrum and X-ray diffraction. The adhesive strength of the coating and Ti substrate was determined by shear strength testing. The results indicate that the adhesive strength of Co-YSZ/HAp nano-composite coating and Ti substrate is higher than that of nano-HAp single coating and Ti substrate. It shows that Co-YSZ as an interlayer reduces the mismatch of the thermal expansion coefficients between HAp and titanium and Co-YSZ/HAp nano-composite coating has better mechanical properties.国家自然科学基金(20573086,200273055);; 福建省自然科学基金(E0210004)资助项

Preparation of Co-YSZ/HAp nano-composite coating on Ti substrate by electrochemical method

Co-YSZ/HAp nano-composite coating and nano-HAp single coating were deposited on Ti substrate using the combination of electrocodeposition and electrophoretic deposition, and electrophoretic depositions, respectively. Surface and cross section morphologies of the coatings were observed by scanning electron microscope. Element distribution and crystal phase of the coatings were analyzed by energy dispersive spectrum and X-ray diffraction. The adhesive strength of the coating and Ti substrate was determined by shear strength testing. The results indicate that the adhesive strength of Co-YSZ/HAp nano-composite coating and Ti substrate is higher than that of nano-HAp single coating and Ti substrate. It shows that Co-YSZ as an interlayer reduces the mismatch of the thermal expansion coefficients between HAp and titanium and Co-YSZ/HAp nano-composite coating has better mechanical properties

Research Progress in Bioactive Hydroxyapatite Coating on Metal Substrate

[中文文摘]羟基磷灰石(HA)是人体和动物的骨骼和牙齿的主要无机成分,人工合成的羟基磷灰石具有良好的生物相容性和生物活性,但质脆;医用金属材料具有较好的强度、韧性和优良的加工性能,但是生物相容性差。金属基生物活性HA涂层材料兼备金属材料优良的力学性能和生物陶瓷材料的生物相容性,成为近年来发展最为迅速的一种生物材料。本文简要评述了国内外金属基HA涂层材料的研究进展状况,主要介绍了制备金属基HA涂层材料的各种物理化学方法,提出了一些存在的问题和解决方法,展望了制备HA复合涂层的发展前景。［英文文摘］The primary inorganic composition of bone and dens is hydroxyapatite. The artifical hydroxyapatite has favorable biocompatibility and bioactivity, but it is brittle. The biomedical metallic materials have high strength, toughness and machinability, but poor biocompatibility. The bioactive hydroxyapatite coating on metal substrate has been developed rapidly for its excellent mechanical properties and fine biocompatibility. In this paper, the research progress in bioactive hydroxyapatite coating on metal substrate was reviewed and the preparation methods were introduced.Some existent problems and resolvents were mentionde,and the outlook of hydroxyapatite coating was prospected as well.国家自然科学基金(20573086); 福建省自然科学基金(E0210004); 厦门大学科技创新基金资助项目

Preparation of TiO_2 Porous Films on Pure Titanium Surface

[中文文摘]以硫酸和磷酸为电解液,工业纯钛为阳极,不锈钢为阴极,恒电流阳极氧化的方式在钛表面直接获得TiO2多孔氧化膜,经过500℃热处理,促进氧化膜由非晶体向晶体的转变.采用扫描电镜和X射线衍射对阳极氧化膜的形貌和结构进行了分析,研究了电流密度、电解液种类以及浓度对TiO2多孔氧化膜形态和晶型的影响,并探讨了其形成机理.结果表明,以磷酸为电解液时钛表面仅生成锐钛矿相的TiO2,而以硫酸为电解液时钛表面生成锐钛矿和金红石两种晶相的TiO2.[英文文摘]The TiO_2 porous films were prepared directly on the surface of pure titanium by constant current anodic oxidation using sulphuric acid and phosphoric acid as electrolytes,pure titanium and stainless steel as anode and cathode respectively.Surface morphologies of the TiO_2 porous films were observed by scanning electron microscope and crystal phases were analyzed by X-ray diffraction.The effects of the current density,the kinds and concentrations of electrolytes on the surface morphologies and crystalline phases of TiO porous films were investigated ,and the forming mechanism of TiO porous films and its crystallization were discussed. The results show that the current density and electrolyte concentration are the two main factors effecting the surface morphologies and crystalline phases of the anodic oxidation films. The TiO porous films are transited from non2crystal to crystal by heat treatment at 500 ℃for two hours. The anodic oxidation films only have anatase phase on the surface of pure titanium in the phosphoric acid ,and the aperture sizes range from several hundred nanometers to several micrometers;whereas the anodic oxidation films have anatase phase and rutile phase on the surface of pure titanium in the sulphuric acid ,and the aperture sizes range from 100 ～ 200 nm.国家自然科学基金(20573086); 福建省自然科学基金(E0210004)

Preparation of YSZ/HAp nano-composite coating on Ti alloy substrate by electrophoretic deposition

[中文文摘]采用电泳沉积法在钛合金基体上制备了YSZ/HAp纳米复合涂层,用场发射扫描电镜、X射线衍射和能量散射谱对复合涂层HAp外层的表面形貌和晶相、复合涂层的断面形貌及元素组成分布进行分析研究,通过粘结-拉伸实验测定了涂层与基体的结合强度。结果表明YSZ/HAp纳米复合涂层与钛合金基体的结合强度明显高于HAp单一涂层与钛合金基体的结合强度,说明YSZ/HAp的复合缓和了HAp涂层与钛合金基体之间的热膨胀系数失配现象,改善了涂层与基体之间的结合。［英文文摘］YSZ/HAp nano-composite coating and HAp single coating were deposited on Ti alloy substrate by electrophoretic deposition.Surface and cross section morphologies of the composite coating were observed by scanning electron microscope.Element distribution and crystal phase of the composite coating were analyzed by energy dispersive spectrum and X-ray diffraction.The bonding strength between coating and Ti alloy substrate was tested by shear strength testing experiment.The results indicate that the bonding strength of YSZ/ HAp　composite coating is higher than that of HAp single coating. It shows that YSZas an interlayer reduces the mismatch of thermal expansion coefficients between HAp coating and substrate and enhances the bonding strength　of the HAp coating to the Ti alloy substrate.国家自然科学基金资助项目(20573086,200273055); 福建省自然科学基金资助项目(E0210004)