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Fabrication and Biological Properties of CeO2 Reinforced Porous Titanium

Author: ZhuYaPing
Tutor: FengBo
School: Southwest Jiaotong University
Course: Materials Science and Engineering
Keywords: Slurry foaming method Porous Titanium CeO2 Mechanical properties Biomimetic Interfacial bonding strength Osseointegration
CLC: TG146.23
Type: Master's thesis
Year: 2009
Downloads: 53
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Abstract


The pore structure of porous titanium can effectively reduce the presence of the elastic modulus and strength, reducing the titanium implant and bone tissue between the stress shielding; Meanwhile, the unique porous structure is conducive to bone cell adhesion, proliferation and differentiation, promote new bone ingrowth pores, promote tissue regeneration and reconstruction, to accelerate the healing process. High porosity porous titanium for improving the biological performance, especially guided tissue ingrowth to improve their ability to repair tissue has very important significance. But as the porosity increases, the mechanical properties of bound dramatically. Therefore, how to ensure high porosity porous titanium under the premise of improving its mechanical properties, become bound to solve the problem. In this thesis, the slurry foaming method, titanium powder by adding a certain amount of CeO2, successfully prepared different porosity porous titanium reinforced earth, and by scanning electron microscopy (SEM), X-ray diffraction (XRD) and mechanical testing by means of porous titanium were characterized, while using acid treatment and alkali treatment on porous titanium surface activation, and finally through biomimetic mineralization experiments and in vivo animal experiments on the rare earth Ce02 porous titanium enhanced biological properties were studied. Mechanical testing results show that when Ce02 addition is 0.2wt.% When the mechanical properties of porous titanium most significant enhancement effect. Metallurgical experiments show, Ce02 adding grain refinement of titanium, which is Ce02 enhance the mechanical properties of porous titanium main reason. The blowing agent (H202) concentration in certain circumstances, by controlling the ratio of solid slurry can be prepared by a porosity of 35.2% -79.7% of the porous titanium. Detected only titanium XRD peaks, peaks Ce02 not found, probably due to the amount added is too small Ce02. SEM analysis, Ce02 adding pore structure of the porous titanium little effect, the pores of porous titanium shape in three dimensions through the pore size mainly distributed in 100-700μm, and holes in the walls of large micron pore distribution, with porous titanium help to improve the biological activity. Further mechanical tests showed that, compared with the Young's modulus, compressive strength of the porous titanium is more sensitive to changes in porosity. Porosity of 64.9% of Ce02 enhanced porous titanium, its mechanical properties (Young's modulus 3.07GPa, compressive strength 89.51MPa) and bone tissue is more match. 72.8% of the porosity of the porous titanium Ce02 enhanced, the Young's modulus and compressive strength of 2.08GPa and 60.19MPa, also exhibits the mechanical properties of bone tissue similar. Acid treated porous titanium surface was porous network-like, alkali acicular structure after heat treatment. Biomimetic experiments showed that the acid treatment and alkali treatment of the porous titanium, in simulated body fluid (SBF) and fast calcification solution (FCS) can induce the hydroxyapatite (HA) formation, exhibit a biological activity . But the acid treated porous titanium stronger induction of HA, show a higher biological activity. Meanwhile, rare earth Ce02 enhanced porous titanium and titanium-based bioactive porous titanium significant difference. It is also found, acid treated porous titanium in SBF and induce the formation of HA in the FCS low crystallinity, calcium ratio is less than 1.67, along the (002) plane growth significantly, these properties is similar to bone apatite. Experiments in animals, acid treatment can improve porous titanium and Ce02 enhanced interfacial bonding between bone strength and, after acid HA coatings deposited on the surface of the bonding strength can be further enhanced. Histological and SEM analysis showed that the acid treatment and surface coating Ce02 enhanced HA porous titanium and bone tissue binding mode as osseointegration. Ce02 acid treatment can not only improve the porous titanium enhanced bonding between bone tissue situation, and can accelerate the bone tissue to grow inside the material, and acid treated HA coatings deposited on the surface of the effect can be further enhanced. Meanwhile, the results showed that intramuscular implantation, Ce02 enhanced porous titanium can induce early ingrowth of fibrous tissue and blood vessels inside the pores.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Titanium
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