Mechanical properties of porous titanium compacts prepared by powder sintering

Oh, Ik Hyun; Nomura, Naoyuki; Masahashi, Naoya; Hanada, Shuji

doi:10.1016/j.scriptamat.2003.08.018

Cited by 532 publications

(336 citation statements)

References 14 publications

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“…In particular, they found that the reaction zone is constituted by Ti borides (TiB and TiB 2 ) and nitrides (TiN 1-x and TiN). Other works have been done considering the hot pressing technique to obtain porous titanium compacts (Oh, 2003) where a BN coating was used to avoid the reaction between graphite and the powder but none of them reports any kind of interaction. Figure 9 shows representative examples of the load-deflection curve for each of the materials studied and, in particular, the curve shown refer to the specimens hot-pressed at 1300ºC whose surface was removed.…”

Section: M) Energy Dispersive X-ray Analysis Indicates That This Laymentioning

confidence: 99%

Mechanical properties and microstructural evolution of vacuum hot-pressed titanium and Ti–6Al–7Nb alloy

Bolzoni

Ruiz-Navas

Neubauer

et al. 2012

Journal of the Mechanical Behavior of Biomedical Materials

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Mechanical properties and microstructural evolution of vacuum hot-pressed titanium and Ti-6Al-7Nb alloy, Journal of the Mechanical Behavior of Biomedical Materials, May 2012, v. 9, p. 91-99, doi: http://dx.doi.org/10.1016/j.jmbbm.2012.01.015 © Elsevier 2012Graphical Abstract > Hot-pressing is used to make almost fully dense titanium and Ti-6Al-7Nb alloy. > Study of the bending properties of elemental titanium and Ti-6Al-7Nb alloy. > Study of the interaction between titanium and processing tools. > Microstructural evolution of the materials with the processing temperature. increases. This is due to the interaction with the BN coated mould and leads to the formation of a reacted layer in the surface, composed by different titanium compounds, which greatly affect the mechanical properties. Nevertheless, the removal of this reacted layer leads to an important improvement of the ductility, especially for elemental titanium.

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Section: M) Energy Dispersive X-ray Analysis Indicates That This Laymentioning

confidence: 99%

Mechanical properties and microstructural evolution of vacuum hot-pressed titanium and Ti–6Al–7Nb alloy

Bolzoni

Ruiz-Navas

Neubauer

et al. 2012

Journal of the Mechanical Behavior of Biomedical Materials

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“…The SBF solution for in vitro tests was prepared by dissolving the following analytical reagents in 1 L of deionized water: 6.547 g of NaCl, 2.268 g of NaHCO 3 , 0.372 g of KCl, 0.124 g of NaHPO 4 , 0.305 g of MgCl 2 Á6H 2 O, 0.368 g of CaCl 2 Á2H 2 O, 0.071 g of Na 2 SO 4 and 6.057 g of trishydoxmethylaminomethane. Each foam specimen was placed into a polypropylene tube contained 6 ml SBF solution.…”

Section: Bioactivity and Characterizationmentioning

confidence: 99%

“…In the sintering powder compacts method, relatively large powder sizes are generally used; however, the method inherently produces relatively small pore size and low porosity. The pore size and porosity typically range between 53 and 85 mm and 5 and 54%, respectively [4][5][6]. In contrast, the space holder method comes up with relatively larger pore sizes, 200-500 mm, and higher porosities, up to 80% [7].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the space holder method comes up with relatively larger pore sizes, 200-500 mm, and higher porosities, up to 80% [7]. Both methods; however, allow the direct near net-shape fabrications of porous implant components having elastic modulus and strength values comparable with those of natural bone [4,6]. Certain implant applications of Ti alloy foams have also been recently exploited including spinal cages used in spinal surgery for bone fixation [8].…”

Section: Introductionmentioning

confidence: 99%

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The effect of surface treatment on CaP deposition of Ti6Al4V open cell foams in SBF solution

Türkan

Güden

2010

Ceramics International

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The effects of alkali and nitric acid surface treatment and acid etching on the CaP deposition of an open cell Ti6Al4V foam (60% porous and 300-500 mm in pore size) developed for biomedical applications were investigated in a simulated body fluid (SBF) solution for 14-day. The surface roughness of the foam specimens ground flat surfaces was measured in nano-metric scale before and after SBF immersion using an atomic force microscope (AFM). A significant increase in the surface roughness of alkali treated foam specimen after SBF immersion indicated a smaller crystal size CaP deposition, which was also confirmed by the AFM micrographs. The microscopic evaluation clearly showed that alkali treatment and nitric acid treatment induced a continuous, uniform CaP deposition on the cell wall surfaces of the foam (interior of cells). While in untreated foam specimen the cells are filled with CaP precipitates and acid etching did not produce a continuous coating layer on particles interior of the cells. The coating layer thickness was $3 mm in alkali treated foam specimens after 14-day of SBF immersion, while nitric acid treatment induced relatively thinner coating layer, 0.6 mm. #

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“…To minimize the negative impact of this stiffness incompatibility, substitutes with a controlled porosity can be introduced . Oh et al (2003) obtained the Young's modulus of porous titanium close to that of bone by changing the voids volume fraction fv . They reduced this property from 110 GPa (bulk titanium) to 10 GPa for fv = 0.35.…”

Section: Introductionmentioning

confidence: 97%

Development and mechanical characterization of porous titanium bone substitutes

Barbas

Bonnet

Lipiński

et al. 2012

Journal of the Mechanical Behavior of Biomedical Materials

158

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Commercially Pure Porous Titanium (CPPTi) can be used for surgical implants to avoid the stress shielding effect due to the mismatch between the mechanica l properties of titanium and bone . Most researchers in this area deal with randomly distributed pores or simple architectures in titanium alloys. The control of porosity, pore size and distribution is necessary to obtain implants with mechanical properties close to those of bone and to ensure their osseointegration . The aim of the present work was therefore to develop and characterize such a specific porous structure. First of all, the properties of titanium made by Selective Laser Melting (SLM) were characterized through experimental testing on bulk specimens. An elementary pattern of the porous structure was then designed to mimic the orthotropic properties of the human bone following several mechanical and geometrical criteria . Finite Element Analysis (FEA) was used to optimize the pattern . A porosity of 53% and pore sizes in the range of 860 to 1500 µm were fi.nally adopted . Tensile tests on porous samples were then carried out to validate the properties obtained numerically and identify the failure modes of the sam_ples. Final!y, FE elasto_plastic ana!yses were yerformed on the porous samples in order to propose a failure criterion for the design of porous substitutes . .

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Mechanical properties of porous titanium compacts prepared by powder sintering

Cited by 532 publications

References 14 publications

Mechanical properties and microstructural evolution of vacuum hot-pressed titanium and Ti–6Al–7Nb alloy

Mechanical properties and microstructural evolution of vacuum hot-pressed titanium and Ti–6Al–7Nb alloy

The effect of surface treatment on CaP deposition of Ti6Al4V open cell foams in SBF solution

Development and mechanical characterization of porous titanium bone substitutes

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