Production and characterization of surface treated biomedical Ti6Al7Nb alloy foams /

Download

index.pdf

Date

2015

Author

Bütev, Ezgi

Metadata

Show full item record

Item Usage Stats

256
views

115
downloads

The current study was undertaken to investigate the production and surface processing of biomedical Ti6Al7Nb alloy foams. Space holder method was utilized to manufacture foams with varying porosities around 53.0-73.0 vol. % via evaporation of magnesium from compacted Ti6Al7Nb-Mg powder mixtures. Bioactivities of foam surfaces were further enhanced by obtaining sodium rich phases using NaOH alkali-heat treatment method. Moreover, untreated and surface treated foams were tested in simulated body fluid (SBF) in order to investigate the apatite formation and compare the bioactivities of the surfaces. It has been observed that Ti6Al7Nb alloy foams with average pore size of 200 μm can be considered as suitable materials for biomedical applications due to their mostly interconnected open porous structures. Quasi-static compression tests showed that stress-shielding problem may be alleviated by use of foams having porosities in the range 63.0-73.0 vol. % because of their elastic moduli close to that of bone. The relation between mechanical properties and macro porosity contents of foams was observed to obey power law relation in which the proportionality constant and the exponent reflected the structure and properties of micro porous cell walls and macropore character of foams. Heat treatment of foams at 600 oC, subsequent to immersion in 5 M NaOH solution at 60 oC, provided transformation of sodium titanate hydrogel, NaxH2-xTiyO2y+1.nH2O, layer into more stable sodium titanate, Na2TiyO2y+1, phase. NaOH alkali-heat treated surfaces allowed hydroxyapatite, Ca10(PO4)6(OH)2, formation in shorter time and exhibited superior bioactivities during SBF tests.

Subject Keywords

Titanium alloys., Titanium-aluminum alloys., Biomedical materials., Biomedical engineering.

URI

http://etd.lib.metu.edu.tr/upload/12618414/index.pdf
https://hdl.handle.net/11511/24382

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Fabrication of functionalized citrus pectin/silk fibroin scaffolds for skin tissue engineering Türkkan, Sibel; Atila, Deniz; Akdağ, Akın; Tezcaner, Ayşen (Wiley, 2018-10-01) In this study, novel porous three-dimensional (3D) scaffolds from silk fibroin (SF) and functionalized (amidated and oxidized) citrus pectin (PEC) were developed for skin tissue engineering applications. Crosslinking was achieved by Schiff's reaction in borax presence as crosslinking coordinating agent and CaCl2 addition. After freeze-drying and methanol treatment, plasma treatment (10 W, 3 min) was applied to remove surface skin layer formed on scaffolds. 3D matrices had high porosity (83%) and interconnec...
Fabrication and cellular interactions of nanoporous tantalum oxide Uslu, Ece; Garipcan, Bora; Ercan, Batur (Wiley, 2020-10-01) Tantalum possesses remarkable chemical and mechanical properties, and thus it is considered to be one of the next generation implant materials. However, the biological properties of tantalum remain to be improved for its use in tissue engineering applications. To enhance its cellular interactions, implants made of tantalum could be modified to obtain nanofeatured surfaces via the electrochemical anodization process. In this study, anodization parameters were adjusted to obtain a nanoporous surface morpholog...
Manufacturing, mechanical and microstructural characterization of AZ91D magnesium alloy for biomedical applications Kayhan, Said Murat; Evis, Zafer; Koç, Muammer; Department of Engineering Sciences (2015) In this study, the microstructural and mechanical properties of the Mg-based implant samples prepared via powder metallurgy route were investigated. Moreover, the biological response of the Mg-based implant samples was investigated. AZ91D Mg alloy discs with smooth and textured surfaces were manufactured under compaction pressures of 25 and 40 MPa at 150⁰C. They were then sintered at 380⁰C for 30 and 150 mins. The microstructural evaluation was conducted through SEM and light microcopy images. As compaction...
PRODUCTION OF SILVER LOADED PHOTOCATALYTIC TIO2 POWDERS BY BALL MILLING Aysin, Basak; PARK, JONGEE; Öztürk, Abdullah (2011-09-23) The present study was undertaken to improve photocatalytic efficiency of TiO2 powder by silver doping and/or particle size reduction through mechanical ball milling. A planetary ball mill was employed to reduce the particle size of TiO2 powders to nanoscale and silver loading to TiO2 powders. Silver nitrate was used as silver source to obtain about 1% Ag load. Slurry taken from ball mill was separated by centrifugal separator into nano and micro sols. Separated nanosol was taken into the furnace to be dried...
Predicting time-dependent remodeling of bone around immediately loaded dental implants with different designs Eser, Atilim; Tönük, Ergin; Akça, Kıvanç; Cehreli, Murat Cavit (Elsevier BV, 2010-01-01) The purpose of this study was to predict time-dependent biomechanics of bone around cylindrical screw dental implants with different macrogeometric designs under simulated immediate loading condition. The remodeling of bone around a parallel-sided and a tapered dental implant of same length was studied under 100 N oblique load by implementing the Stanford theory into three-dimensional finite element models. The results of the analyses were examined in five time intervals consisting loading immediately after...

Citation Formats

E. Bütev, “Production and characterization of surface treated biomedical Ti6Al7Nb alloy foams /,” M.S. - Master of Science, Middle East Technical University, 2015.