Direct ink writing of porous titanium (Ti6Al4V) lattice structures

Elsayed, Hamada; Rebesan, Pietro; Giacomello, Giovanni; Pasetto, Marco; Gardin, Chiara; Ferroni, Letizia; Zavan, Barbara; Biasetto, Lisa

doi:10.1016/j.msec.2019.109794

Cited by 60 publications

(38 citation statements)

References 44 publications

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“…Effective elastic moduli together with uniaxial compression strength for homogeneously and gradient porous designs were found to be 2.2 GPa and 3.0 GPa, and 57% and 45%, respectively, and as of 47 and 90 MPa of compression strength, values being intermediate between those for cancellous and cortical bones [137]. In similar research [138], the 3D printed Ti-6Al-4V scaffolds were made. After the printing process and drying, the components were sintered at 1400 • C. Highly porous titanium scaffolds (with porosity up to 65 vol.%) were produced and different geometries were printed.…”

Section: Direct Ink Writing (Diw)mentioning

confidence: 80%

Structural and Material Determinants Influencing the Behavior of Porous Ti and Its Alloys Made by Additive Manufacturing Techniques for Biomedical Applications

Dziaduszewska

Zieliński

2021

Materials

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One of the biggest challenges in tissue engineering is the manufacturing of porous structures that are customized in size and shape and that mimic natural bone structure. Additive manufacturing is known as a sufficient method to produce 3D porous structures used as bone substitutes in large segmental bone defects. The literature indicates that the mechanical and biological properties of scaffolds highly depend on geometrical features of structure (pore size, pore shape, porosity), surface morphology, and chemistry. The objective of this review is to present the latest advances and trends in the development of titanium scaffolds concerning the relationships between applied materials, manufacturing methods, and interior architecture determined by porosity, pore shape, and size, and the mechanical, biological, chemical, and physical properties. Such a review is assumed to show the real achievements and, on the other side, shortages in so far research.

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Section: Direct Ink Writing (Diw)mentioning

confidence: 80%

Structural and Material Determinants Influencing the Behavior of Porous Ti and Its Alloys Made by Additive Manufacturing Techniques for Biomedical Applications

Dziaduszewska

Zieliński

2021

Materials

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“…The adopted process is based on Direct Ink Writing (DIW) technique, i.e. the extrusion of a viscoplastic paste through a nozzle of reduced diameter [8]. Techniques for the fabrication of complex shape components, such as stereolithography, require organic polymerization reactions or solidification of liquid or melted polymer; DIW instead relies on rheological characteristics and partial drying of the individual layers to produce the piece.…”

Section: Used Inkmentioning

confidence: 99%

“…Techniques for the fabrication of complex shape components, such as stereolithography, require organic polymerization reactions or solidification of liquid or melted polymer; DIW instead relies on rheological characteristics and partial drying of the individual layers to produce the piece. For optimal performance with this methodology, the rheological properties during processing should be controlled to avoid filament deformation [8]. To achieve this, a high solid loading should be used since it quickly set to high viscosity after extrusion, thus limiting deformation [22].…”

Section: Used Inkmentioning

confidence: 99%

Robotic Additive Printing of Cylindrical Auxetic Structures

Biasetto

Boschetti

Minto

2020

Mechanisms and Machine Science

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Additive manufacturing technologies represent an interesting solution to aid companies to offer a wide range of customized products. Furthermore, they allow printing complex lattice and auxetic structures. The use of robot manipulators for 3D printing allows overcoming several limitations of traditional additive manufacturing systems, i.e. low surface quality (stair-casing effects) and undesirable anisotropic properties, so as to print complex geometries on curved surfaces. This work presents an experimental setup designed to print cylindrical auxetic structures composed of a 3D printer and a robotic arm. The system produces the part without any assembly and avoiding staircase effects. Furthermore, using the robot for moving the printing based simplified the control system and allows for simpler printing devices.

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“…As a relatively new engineering material, Ti alloys have been widely used in the fields of biomedicine, automotive, and aerospace due to its advantages of high strength to weight ratio, superior corrosion resistance, excellent biocompatibility, and low elastic modulus. Previously, several attempts were made to manufacture Ti alloys with BJ3DP [9][10][11][12]. Barui et al [13] used Washburn model to quantify the capillary ink infiltration time in a porous powder bed of finite thickness, and successfully manufactured Ti6Al4V parts with strength reliability and cytocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Capillary Force of Binder-Jetting Printing Ti6Al4V and Mechanical Properties under High Temperature Sintering by Mixing Fine Powder

Tang

Huang

Yang

et al. 2020

Metals

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Binder jet 3D printing (BJ3DP) is an additive manufacturing technology that selectively deposits binder on powder to form a three-dimensional green body followed by sintering process. The low strength of green body and metallurgical issues limit the manufacture of Ti6Al4V parts with high-performance and that are lightweight. In this study, thermal-bubble inkjet technology was used to print Ti6Al4V parts via jetting low-concentration in-situ polymer binders. In addition, a method for mixing fine powder was used to enhance the capillary force of the powder bed and mechanical properties of the parts. The results show that the capillary force was enhanced from 8.35 kPa for pure powder to 16.27 kPa for mixed powder by mixing fine powder. The compression strength of green body was enhanced from 1.5 MPa to 3.21 MPa. After sintering, the sample with mixed powder sintered at 1420 °C for 2 h had achieved a maximum density of 95.2%, microhardness of 316 HV, and yield stress of 589 MPa. The relative density of 95.2% of Ti6Al4V parts fabricated by BJ3DP technology in our study is significantly higher than the value reported in the existing literature. Finally, the porous structure with a size of 550 μm was fabricated. Results presented demonstrate that BJ3DP can produce Ti6Al4V parts with excellent properties.

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Direct ink writing of porous titanium (Ti6Al4V) lattice structures

Cited by 60 publications

References 44 publications

Structural and Material Determinants Influencing the Behavior of Porous Ti and Its Alloys Made by Additive Manufacturing Techniques for Biomedical Applications

Structural and Material Determinants Influencing the Behavior of Porous Ti and Its Alloys Made by Additive Manufacturing Techniques for Biomedical Applications

Robotic Additive Printing of Cylindrical Auxetic Structures

Enhancing the Capillary Force of Binder-Jetting Printing Ti6Al4V and Mechanical Properties under High Temperature Sintering by Mixing Fine Powder

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