Effects of morphological characteristics on the mechanical behavior of 3D printed ordered pore topological Fe scaffold

Mishra, Dipesh Kumar; Pandey, Pulak M.

doi:10.1016/j.msea.2021.140759

Cited by 18 publications

(15 citation statements)

References 38 publications

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“…These variations were observed as the resulted effect of shrinkage in the fabricated OPTFS. The deviation in dimensions of the prepared Fe scaffold as compared to the CAD model was obtained in the range of

0.6 - 6 % .

27 The reasons could be attributed to the shrinkage in prepared H‐OPTFS due to the diffusions and misorientations of CIPs during pressureless microwave sintering 26 . Initially, metal particles (CIPs) were slackly bonded with a polymer in micro‐extruded 3D printed part because no compaction was applied prior to heating 26 .…”

Section: Discussionmentioning

confidence: 99%

“…Initially, metal particles (CIPs) were slackly bonded with a polymer in micro‐extruded 3D printed part because no compaction was applied prior to heating 26 . After the first stage of thermal debinding, the binders were degraded completely and resulted into the existence of space between the metal particles 27 . These spaces were reduced by the diffusion of adjacent particles during the subsequent rise of heating temperature.…”

Section: Discussionmentioning

confidence: 99%

“…The route followed for preparing the metal‐based polymeric ink was the same as described in the reported studies 25,26 . Further to this, green bodies of the desired CAD model was printed using prepared metal‐based polymeric ink with the aid of a micro‐extrusion‐based 3D printer (Biobot) 27,28 . The optimum process parameters were adopted in the present study for fabricating the green body was calculated based on central composite design and Genetic Algorithm, respectively 25 .…”

Section: Methodsmentioning

confidence: 99%

“…The cylinder‐shaped Fe samples of dimensions Ø 10 ⨯ 15

{mm}^{2}

which have inherent characteristics of TFPM were fabricated by developed manufacturing techniques 26,27 . The sintering cycle used for fabricating the TFPM cylindrical shaped samples have been presented in Figure 1A 26 .…”

Section: Methodsmentioning

confidence: 99%

“…Initially, a CAD model of the hexagonal based unit cell (interconnected ordered pore structure) was designed. Subsequently, hexagonal based ordered pore topological Fe scaffolds (H‐OPTFS) of dimensions

25 \times 21 \times 25 {mm}^{3}

were printed using the developed metal based polymeric ink which can be inferred from Figure 2A 27 . The variations in the range of porosity were obtained in fabricated H‐OPTFS by changing the pore dimension of the hexagonal based unit cell while keeping overall volume as remain constant.…”

Section: Methodsmentioning

confidence: 99%

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Corrosion behavior and degradation mechanism of micro‐extruded 3D printed ordered pore topological Fe scaffolds

Mishra

Pandey

2022

J Biomed Mater Res

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The fabrication of ordered pore topological structures (OPTS) with an improved biodegradation profile offers unique attributes required for bone reconstruction. These attributes consisted of fully interconnected porous structure, bone‐mimicking mechanical properties, and the possibility of fully regenerating bony defects. Most of the biomaterials based on magnesium were associated with the problem of too fast degradation rate. Here, the present aim was based on the fabrication of ordered pore topological Fe structures (OPTFS) using micro‐extrusion‐based 3D printing followed by pressureless microwave sintering. Two different kinds of pore features namely randomly distributed interconnected micropores and designed interconnected macropores were investigated. Static in vitro degradation results inferred that the H‐2 mm pore size of hexagonal based ordered pore topological Fe structures (H‐OPTFS) exhibited the highest degradation rate of 6.45 mg cm−2 day−1 on the 28th day. Electrochemical results revealed that the corrosion current density of the T‐1 Fe sample with 44% porosity increased nearly by a multiple of three times as compared to dense Fe (from 16.79 to 44.63 . Similarly, these results showed more significance in H‐2 mm pores size (with highest 66% porosity) of H‐OPTFS as compared to H‐1.75 mm and H‐1.5 mm pore size of H‐OPTFS (≈2 times higher degradation rate than H‐1.5 mm pore size). Moreover, the MG63 osteoblast cell line was adhered to and proliferated significantly throughout the surface and illustrated more than 80% cell viability of the prepared porous Fe scaffold. The analyzed results have shown the potential of fabricated OPTFS could be considered for biomedical applications.

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