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Fabrication of Titanium Based Porous Biocomposites

Author: ShiHuan
Tutor: LiuZhiGuang
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: Titanium Hydroxyapatite Porous composite Spark Plasma Sintering Calcium carbonate
CLC: R318.08
Type: Master's thesis
Year: 2008
Downloads: 44
Quote: 1
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Abstract


In recent years, titanium and titanium alloys are used extensively for the repair of tissue damage in the human bone. However, titanium and bone tissue elastic modulus mismatch. The hydroxyapatite (Hydroxyapatite) bone memory in the unit, has a natural biocompatible. Hydroxyapatite brittle so that as artificial implants certain restrictions. In addition, calcium carbonate in the chemical belongs salt, no harmful to the human body, decomposition under high-temperature gas is generated. This selection of hydroxyapatite and calcium carbonate as a pore-forming agent was added, and titanium together with their advantages, the use of mechanical milling, plasma sintering tube furnace pressure sintering technology, trying to prepare a good overall performance titanium-based porous bio-composite materials. This article was prepared by two series of composite materials: Ti / HA system and Ti / CaCO , 3 Department. Mechanical alloying, powder milling and uniform composition, the milling process does not respond. 1200 ° C discharge plasma sintering relatively dense and full Ti / HA and Ti / CaCO 3 Department of bio composites, XRD analysis showed that after sintering Ti / HA Department of the bulk material Ti2O TiO , the CaTiO 3 and other new phase the Ti / CaCO 3 Department of bulk materials in the CaO new phase. 1300 ° C and 1400 ° C tube furnace pressure sintering the complete Ti / CaCO 3 Department of bulk materials, XRD analysis of sintered displayed the Ti2O, CaO and TiO generated new phase. With the sintering pressure is reduced and the HA content increases, the composites increased porosity and the pore size increases. Ti / HA and Ti / CaCO 3 Department of the pore size of the sintered body can be improved by the acid treatment with the acid treatment time increases, the porosity increases increasing trend, the submicroscopic pores increase in the number of obvious . Acid-treated Ti / HA system composite pore size can reach 300, the Ti / CaCO 3 system the composite pore size can reach 200 M sintered body size and distribution can be controlled by controlling the acid treatment process conditions . The test of the mechanical properties of the composites showed that Ti / HA and Ti / CaCO , 3 series of composite materials with high hardness, moderate compressive strength and low density. Ti / HA and Ti / CaCO 3 Department bulk composites minimum hardness and minimum compressive strength were 66HV, 111HV and 119MPa, 317MPa. Ti / HA and Ti / CaCO 3 Department of block composite yield plateau in the compression process has a certain compression showed brittle fracture.

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