Fabrication and characterization of highly porous Ti6Al4V/xTa composites for orthopedic applications

Garnica, P.; Macías, R.; Chávez, J.; Bouvard, D.; Jiménez, O.; Olmos, L.; Arteaga, Dante

doi:10.1007/s10853-020-05166-5

Cited by 8 publications

(6 citation statements)

References 42 publications

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“…The values of σ y /E range from 12 to 16 × 10 −3 and the highest value corresponds to the Ti64/20Ag sample with 50 vol.% of pore formers. In conclusion, these values are higher than the ones reported for the solid Ti64 [ 46 ] but lower than the ones obtained for porous composites of Ti64/xTa [ 47 ]. More, the σ y /E values are in the range of the compact bones (11 × 10 −3 ) but lower than the ones reported for the human vertebral trabecular bone (35 × 10 −3 ) [ 3 ].…”

Section: Resultscontrasting

confidence: 73%

Ti64/20Ag Porous Composites Fabricated by Powder Metallurgy for Biomedical Applications

et al. 2022

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We present a novel Ti64/20Ag highly porous composite fabricated by powder metallurgy for biomedical applications and provide an insight into its microstructure and mechanical proprieties. In this work, the Ti64/20Ag highly porous composites were successfully fabricated by the space holder technique and consolidated by liquid phase sintering, at lower temperatures than the ones used for Ti64 materials. The sintering densification was evaluated by dilatometry tests and the microstructural characterization and porosity features were determined by scanning electron microscopy and computed microtomography. Permeability was estimated by numerical simulations on the 3D real microstructure. Mechanical properties were evaluated by simple compression tests. Densification was achieved by interparticle pore filling with liquid Ag that does not drain to the large pores, with additional densification due to the macroscopical deformation of large pores. Pore characteristics are closely linked to the pore formers and the permeability was highly increased by increasing the pore volume fraction, mainly because the connectivity was improved. As expected, with the increase in porosity, the mechanical properties decreased. These results permitted us to gain a greater understanding of the microstructure and to confirm that we developed a promising Ti64/20Ag composite, showing E of 7.4 GPa, σy of 123 MPa and permeability of 3.93 × 10−11 m2. Enhanced adaptability and antibacterial proprieties due to Ag were obtained for bone implant applications.

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Section: Resultscontrasting

confidence: 73%

Ti64/20Ag Porous Composites Fabricated by Powder Metallurgy for Biomedical Applications

et al. 2022

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“…For that, 3D images follow different mathematical operation to convert the initial grey levels images into the binary ones. The segmentation process is detailed elsewhere [ 31 ]. The remaining Ta particles after sintering in the samples with 20, 25 and 30 wt.% of Ta are shown in Figure 8 .…”

Section: Resultsmentioning

confidence: 99%

“…Although additive manufacturing (AM) provides an excellent processing route to fabricate scaffolds, it is very expensive, and fabrication of Ti-Ta alloys is complicated because it implies the local fusion of particles. Thus, the space holder technique offers a less expensive route to obtain highly porous materials of Ti-Ta alloys, as it was shown by Garnica et al that fabricated highly porous Ti6Al4V/xTa materials [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Sintering Analysis of Porous Ti/xTa Alloys Fabricated from Elemental Powders

et al. 2022

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The present work is focused on developing Ti-xTa porous alloys processed by the space holder method and solid-state sintering. The volume fraction of Ta ranged between 20 and 30 wt.%. The sintering kinetics was evaluated by dilatometry tests. Sintered materials were characterized by SEM, XRD and computed tomography. Porosity features and permeability were determined from 3D images, and their mechanical properties were evaluated from microhardness and compression tests. The sintering behavior and the final microstructure are driven by the Ta diffusion into the Ti, slowing down the densification and modifying the transition temperature of α-to-β. Due to β-stabilization, martensite α′ was obtained after sintering. Mechanical properties are reduced because of the β-stabilization and pore addition, being predominantly the pore effect. Permeability depended on the pore characteristics, finding values close to the human bones. It was concluded that powder metallurgy generates highly TixTa alloys with a combination of α, β and α′ Ti phases as well as remaining Ta particles that are beneficial to improve the biocompatibility and osseointegration of such materials. Being the Ti25Ta40salt alloy the most suitable for orthopedic implants because of its characteristics and properties.

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“…The second material was designed to improve osseointegration as well as to provide antibacterial feature and reduce the Young's module with regard to dense Ti64. For the last property, a highly porous material is desired, which has been obtained by using 40 vol.-% of pore formers [28]. The pore formers were eliminated during a 6 h holding at 180°C in argon, before sintering.…”

Section: (E))mentioning

confidence: 99%

Fabrication of tailored Ti6Al4V-based materials by conventional powder metallurgy for bone implant applications

et al. 2023

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This works proposes a methodology for fabricating materials with specific characteristics mimicking human bones. A Ti64 alloy powder was used as the base material and it was mixed with Ag, Ta, TiN and salt particles to obtain different features. A hip-bone like component was fabricated, including a highly porous core of Ti64/25Ta/5Ag and a compact outer shell of Ti64/5Ag that is supposed to improve corrosion and osseointegration. Besides, a harder cover surface in Ti64/10TiN composite should increase the wear resistance. The green component was sintered at 1260°C in argon. Its Young's modulus was close to the one of bones due to the added porosity, which also provided a permeability close to the one reported for trabecular bones. Tribocorrosion behaviour in simulated body fluid was improved by TiN addition. In conclusion, the proposed processing route was able to produce complex components fulfilling specific features required for human bone replacement.

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Fabrication and characterization of highly porous Ti6Al4V/xTa composites for orthopedic applications

Cited by 8 publications

References 42 publications

Ti64/20Ag Porous Composites Fabricated by Powder Metallurgy for Biomedical Applications

Ti64/20Ag Porous Composites Fabricated by Powder Metallurgy for Biomedical Applications

Sintering Analysis of Porous Ti/xTa Alloys Fabricated from Elemental Powders

Fabrication of tailored Ti6Al4V-based materials by conventional powder metallurgy for bone implant applications

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