Lamellar structure/processing relationships and compressive properties of porous Ti6Al4V alloys fabricated by freeze casting

Li, Fuping; Xue, Xu; Jia, Tao; Dang, Wei; Zhao, Kang; Tang, Yufei

doi:10.1016/j.jmbbm.2019.103424

Cited by 16 publications

(5 citation statements)

References 47 publications

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“…Nevertheless, increasing porosity and pore size can reduce the mechanical properties of the material in general, compromise the stability of the implant, and negatively affect bone tissue reconstruction. [19,24] A reasonable pore structure seems to be the key to balancing mechanical properties and the large pore size requirements of biological properties. In our previous study, we showed that multichannel porous honeycomb titanium prepared by the freeze casting method had a porosity of 60% and an average pore size greater than 100 μm and that the mechanical properties of honeycomb titanium were superior to those of conventional lamellar porous titanium when the porosity and average pore size were close.…”

Section: Introductionmentioning

confidence: 99%

Fabricating Honeycomb Titanium by Freeze Casting and Anodizing for Biomedical Applications

Chen

Liu

et al. 2021

Adv Eng Mater

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Herein, porous titanium materials with honeycomb pore structure are prepared by freeze casting. The effect of freezing temperature on the pore structure and mechanical properties is also investigated. As the freezing temperature decreases from À10 to À50 C, the compressive strength decreases from 79.5 AE 9.2 to 55.0 AE 4.3 MPa, and then increases to 90.1 AE 4.4 MPa. Porous titanium with an average pore size of 111.3 AE 25.2 μm and porosity over 60% are obtained at À10 C. And the porous titanium is observed to form a neatly arranged nanopore structure with an average pore size of 28.5 AE 2.8 nm on the surface after anodizing. These nanopore structures can promote MG-63 cell adhesion and proliferation, thus improving the biocompatibility of porous titanium. Further, in the simulated body fluid culture experiment, culturing for 3 days can induce Ca 2þ and PO 4 3À to nucleate and deposit on the surface of anodized porous titanium, while 7 days can deposit a lot of apatite on the surface. In contrast, no apatite deposition is observed on the surface of the porous titanium sample without anodizing. These prepared porous titanium materials with high porosity, large pore size, sufficient mechanical properties, good biocompatibility, and biological activity might be a potential biomedical material.

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Section: Introductionmentioning

confidence: 99%

Fabricating Honeycomb Titanium by Freeze Casting and Anodizing for Biomedical Applications

Chen

Liu

et al. 2021

Adv Eng Mater

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“…For the ZRA0 and ZRA10, the “bridges” between the layers were caused by the entrainment of titanium particles. [ 40 ] Compared with ZRA0 and ZRA10 samples, the structural difference of ZRA20 is due to the increase in the length and number of “secondary dendrite arms” of dendrite ice crystals and the decreased magnitude in the anisotropic growth. [ 41 ]…”

Section: Resultsmentioning

confidence: 99%

Customizing the Pore Structure and Properties of Freeze‐Cast Porous Titanium by Zirconium Acetate Additive

Chen

Liu

et al. 2020

Adv Eng Mater

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Porous titanium scaffolds with high porosity and connected macropores are fabricated by adding zirconium acetate to control the ice crystal growth during freeze casting. The influences of zirconium acetate additives on the phase composition, pore structure, and mechanical properties of porous titanium are studied. As modified by zirconium acetate, the X‐ray diffraction peaks of titanium moves to a smaller angle, and the zirconium is evenly distributed on the titanium matrix. With the increase in the concentration of zirconium from 0 to 60 g L−1, the pore morphology of porous titanium changes from typical lamellar to the honeycomb, the pore size distribution becomes wider. The average pore size and porosity increases from 44 ± 11 to 126 ± 35 μm and from 46.4 ± 1.3 to 59.1 ± 1.3%, respectively. As the concentration of zirconium acetate is 40 g L−1, the porosity and the pore size of the porous titanium scaffolds are comparable with those modified by 10 g L−1 zirconium acetate, but the compressive strength is 2.3 times higher. Zirconium acetate as an additive has an excellent performance in optimizing the pore structure and mechanical properties of water‐based freeze‐cast porous titanium.

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“…The aforementioned analytical and scaling models have been applied widely in the prediction of particle behaviours, and good agreements with some of the recent experimental studies can be observed [153,184]. Many numerical simulations have also been conducted to investigate the interactions between particles and the freezing front [185][186][187][188][189].…”

Section: Theoretical Studies Of the Particle Engulfment Transition Inmentioning

confidence: 84%

“…At a low freezing rate (1.6 m/s), the freezing front of the suspensions became unstable. The engulfment/pushing of particles in the freezing process for porous alloys has also been reported to affect the morphology of the freezing front [152,153].…”

mentioning

confidence: 99%

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Experimental and numerical studies on freezing of droplets under effects of nanoparticles and magnetic fields

Zhang¹

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Lamellar structure/processing relationships and compressive properties of porous Ti6Al4V alloys fabricated by freeze casting

Cited by 16 publications

References 47 publications

Fabricating Honeycomb Titanium by Freeze Casting and Anodizing for Biomedical Applications

Fabricating Honeycomb Titanium by Freeze Casting and Anodizing for Biomedical Applications

Customizing the Pore Structure and Properties of Freeze‐Cast Porous Titanium by Zirconium Acetate Additive

Experimental and numerical studies on freezing of droplets under effects of nanoparticles and magnetic fields

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