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The Study on Preparation of Hydroxyapatite Layers on Titanium by Dual Calcium and Phosphorus Ion Implantation

Author: DingHongFeng
Tutor: WanZuoZao
School: Tianjin University
Course: Materials Science
Keywords: Ion Implantation Hydroxyapatite Hydrothermal treatment Biomimetic deposition Corrosion resistance
CLC: R318.08
Type: Master's thesis
Year: 2007
Downloads: 55
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Abstract


The ion implantation technique has a significant advantage in the hard tissue implant materials the surface of the active layer having a high bonding strength was prepared. In this study, the first to adopt the MEVVA source metal ion implanter to achieve a calcium injection, and different ways of calcium, phosphorus ion recombination into pure titanium surface composition, structure, biological activity, corrosion resistance; addition This article also explore calcium, phosphorus ion implantation and hydrothermal treatment in the process of the preparation of pure titanium surface HAp active layer. The experiments were calcium and phosphorus ions to 110 keV, 80 keV energy and 2 × 10 17 ion / cm 2 1 × 10 17 ion / in cm 2 dose of to inject pure titanium substrate. EDS and AES analysis: Calcium, phosphorus implantation depth is the same, and the Ca / P ratio close to 1.7; pre-oxidation of calcium and first Note phosphorus after Note the order of 450 ° C is more conducive to improving injection element content and maintain appropriate Ca / P. Means of XRD, XPS and TEM analysis on the specimen surface composition and structure were analyzed, the results show that calcium, phosphorus complex ion implantation surface of the sample are CaO, P2O5 and CaTiO 3 P, Tip and other substances, pre-oxidation of the surface of the sample generated P2O5 and CaP4O11; ion implantation has also prompted the surface of the titanium oxide film changed. Due to changes in the surface composition and structure of the injection of calcium, phosphorus compound significantly increase the hardness and elastic modulus of the sample surface, and improve the smoothness and corrosion resistance of the surface of the material. Hydrothermal treatment on a sample of the type of pretreatment and injection sequence, the study found that had been pre-oxidized titanium surface directly Built-containing HAp bioactive layer. SEM, EDS, XRD and FTIR analysis showed that the water after the heat treatment the two injection sequence of the pre-oxidation of the surface of the sample were precipitated white particulate HAp crystal, the injection of calcium phosphate first sequence is also conducive to the formation of HAp; addition, the temperature also has a significant impact and pressure is formed on the hot product in water at 200 ° C, 1.55 MPa water after the heat treatment, the the HAP particle diameter can reach 1μm. The study also compared the various samples immersed in SBF solution for 7 days after the deposition of HAp deposition morphology difference between ion implantation and hydrothermal treatment process for titanium biological activity to improve the situation. The results show that a single calcium ion implantation to improve the effect of titanium metal deposition HAp superior to the effect of phosphorus ion implantation; polished and pre-oxidized composite sample injection dense HAp deposition layer, but pre-oxidation Note the deposition of calcium phosphorus Note unoxidized sample of the particles than the smaller and more uniform, this is a heat treatment to improve the surface of the specimen due to water and a hydroxyl group content of at the same time, the first formed HAp particles provide a large number of nucleation centers, thus promoting the nucleation of HAp, so that The HAp particles finer.

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