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Preparation, Characterization and Performance of the Bio-coatings on the Surface of Pure Titanium Based on Micro Arc Oxidation

Author: ZhaoZuo
Tutor: CaiQiZhou
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Titanium Micro-arc oxidation Water treatment Calcination treatment Hydroxyapatite Corrosion resistance Cytocompatibility
CLC: R318.08
Type: Master's thesis
Year: 2010
Downloads: 32
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Abstract


Research and development of alternative products bony tissue engineering field is an important branch of the good performance of titanium as a comprehensive medical metal materials, hard bone substitute material development is an important product. However, medical titanium no biological activity, in vivo tissue formation just not solid mechanical fitting. Is a micro-arc oxidation of titanium in medical pore surface, electrochemical deposition techniques, increase its biological activity, the titanium surface and form a strong chemical bond tissue, which in medical titanium surface modification has a good application prospects. In this paper, acetate, calcium - calcium phosphate electrolyte system, namely the use of micro-arc oxidation - water treatment and micro-arc oxidation - calcination treatment process, the titanium surface was prepared containing hydroxyapatite (Hydroxyapatite, HA) Bionic ceramic membrane . The use of SEM, EDX, XRD, thickness gauge, scratch tester, constant potential measuring instrument, cells were studied by means of film morphology and elemental composition of the film phase composition, thickness, bond strength, corrosion resistance and cell compatibility. Compare the two processes biomimetic coatings prepared under the overall performance, and to explore the formation mechanism of hydroxyapatite obtained the following results. In calcium acetate - calcium phosphate electrolyte system, titanium surface after micro-arc oxidation formed a rough and porous TiO2-based oxide film. A medium containing ammonia for water treatment of the film, the film appeared scaly, flaky layers and a needle rod HA, the film thickness increases, and becomes more dense, the film is the Ca / P of 1.68. The formation mechanism of HA micro-arc oxidation film for the nucleation of HA provides active sites, while the autoclave hydrothermal environment of HA nucleation, growth and provide a favorable environment. In calcium acetate - calcium phosphate electrolyte system after adding lanthanum nitrate, rough and porous micro-arc oxidation film, but the emergence of a small number of hairline cracks. Layer mainly composed of anatase and rutile, and contains an amorphous phase, and confirmed after calcination hydroxyapatite and calcium phosphate ceramics. After the calcination treatment the film thickness increases, the crack deepens, the film of the Ca / P is greater than the natural HA of Ca / P. Adding the electrolyte La, by causing a charge imbalance which prompted alkaline TiO 2 of the hydrogel layer is formed, thus contributing to the formation of HA. Film test results show that the binding force: After the water treatment, the water layer with strength than the bonding strength of the film before heat treatment; lanthanum-containing electrolyte layer obtained in binding strength than the electrolyte obtained without lanthanum The film, but the calcination treatment the bonding strength of the film decreases. Film corrosion resistance test results showed that after micro-arc oxidation and subsequent treatment of the surface of the film obtained are superior corrosion resistance of titanium. Micro-arc oxidation film by hydrothermal treatment, its corrosion resistance decreased, while the calcination treatment improved the corrosion resistance of the film. Cells were seeded way to compare four kinds of film and titanium cell compatibility, the results showed that after micro-arc oxidation and subsequent treatment of the resulting film surface biocompatibility are superior surface of titanium. Hydrothermal treatment can improve the cell compatibility layer, and calcination treatment is to some extent reduced the film surface biocompatibility.

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CLC: > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering > General issues > Biomaterial
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