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Research on Powder Sintering Preparation and Properties of Porous Titanium

Author: ChenZuoBo
Tutor: LiYongHua
School: Shenyang University of Technology
Course: Materials Physics and Chemistry
Keywords: Biological materials Porous titanium Sintered powder Surface Modification
CLC: R783.1
Type: Master's thesis
Year: 2011
Downloads: 53
Quote: 0
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Abstract


Recent medical metallic materials are widely used in hard tissue such as root implants. Porous titanium become a hot topic both good biocompatibility and advantages of the unique pore structure. The porous structure is conducive to tissue ingrowth, and the transmission of body fluids. In addition, titanium belongs to a biologically inert material, can be modified by surface treatment to improve its biological activity. In this paper, the preparation of porous titanium powder sintering and chemical method in its surface deposition of hydroxyapatite coating. By powder sintering techniques to add a pore-forming agent, i.e. titanium hydride powder NH4HCO3 sintered porous titanium preparation of different porosity. The mechanical properties of the porous titanium, its porosity, and therefore by the amount of pore-forming agent to be added to achieve the purpose of changing its mechanical properties. The results show that the add pore-forming agent content on the compression strength and porosity properties of porous titanium has a great influence in the pressing and sintering conditions unchanged, the content of the pore forming agent is increased, the compressive strength and modulus of elasticity of porous titanium The amount is gradually reduced; the porosity of the porous titanium made the increase of the added amount of the porogen is substantially proportional increases. Prepared by the change of the pore forming agent is present in an amount appropriate porosity and mechanical properties and bone matches the porous titanium is the focus of this study. The porosity of the sintered porous titanium 41.61-56.74%, and the pore size of 346-427μm, and a compression strength of 100-200MPa, the modulus of elasticity of 7.9-17.5GPa. Meet the compact bone porosity and mechanical performance requirements. The chemical method of this paper on the surface of the sintered porous titanium modified hydroxyapatite coating is deposited, the surface of the porous titanium. The results of the acid treatment of the hole wall surface of the porous titanium leaving small pits, these small pits increases the surface area of ??the inner wall of the porous titanium pore. NaOH lye after treatment in the gel layer of the metal surface to form sodium titanate, alkali-treated porous titanium soaked into the simulated body fluids, can be induced in the surface of the porous titanium deposition hydroxyapatite. Alkali treatment lye concentration and processing time of the deposition of hydroxyapatite has a great impact. Studies have shown that in turn 32.5% nitric acid at 60 ℃ 24h; 1.5M sodium hydroxide at 60 ℃ for 24 h, and then deposited hydroxyapatite coatings in simulated body fluid at 37.5 ℃ treated better. The same conditions as the acid-base processing, pre calcification help to accelerate the speed of of hydroxyapatite porous titanium coating deposition.

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