Micro- and macroscopic design of alumina ceramics by robocasting

Fu, Zongwen; Freihart, Matthias; Wahl, Larissa; Fey, Tobias; Greil, Peter; Travitzky, Nahum

doi:10.1016/j.jeurceramsoc.2017.03.052

Cited by 46 publications

(29 citation statements)

References 28 publications

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“…This, together with similar grain sizes across samples, indicates that there is no significant change in internal stresses by robocasting. As shown by Dellert et al [ 64 ] for tape casting and by Fu et al [ 20 ] for robocasting, standard particles show a predominant orientation in the green body due to the shear rate. As a result, shrinkage during sintering is anisotropic and can cause internal stresses.…”

Section: Resultsmentioning

confidence: 92%

Electromechanical Properties of Robocasted Barium Titanate Ceramics

et al. 2020

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This work presents the fabrication of dense polycrystalline barium titanate (BaTiO3, BT) for electromechanical transduction using robocasting and cold isostatic pressing (CIP). The use of CIP as post‐treatment is proposed to eliminate defects and increase the density of robocasted parts to improve the piezoelectric performance. For robocasting, pastes containing 50 and 52 vol% are developed; the resulting green robocasted parts are CIPed at 100 and 150 MPa. Using this proposed technique, samples robocasted with BT52 and CIPed at 150 MPa display a relative density of ≈98%, comparable with reference polycrystalline samples. In addition, an increase in both the piezoelectric charge and voltage coefficient is observed in robocasted parts, with the values up to 195 pC/N and 12 × 10−3 Vm N−1, respectively. These values, which are comparable with previous studies of polycrystalline BT, indicate that the combined robocasting and CIP technique is a possible method for producing 3D printed piezoelectric sensors.

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Section: Resultsmentioning

confidence: 92%

Electromechanical Properties of Robocasted Barium Titanate Ceramics

et al. 2020

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“…Although the programmable self‐shaping process reported by Bargardi et al was not attributed to the additively manufactured samples and the proposed magnetically aligned alumina micrometer‐sized platelets is unfortunately not universally applicable to other types of ceramic materials, the bilayer architectural concept is still expected to be extendable to fabricate self‐shaped ceramic with geometrically complex morphology by robocasting, in a very similar manner to the work presented by Kokkinis et al With such potentials, it is important to highlight two recent separate studies by Fu et al and Feilden et al that indicated that magnetic field and magnetized Al 2 O 3 micrometer‐sized platelets might not be necessary to achieve oriented platelet microstructures . Fu et al demonstrated a microstructural gradient whereby the micrometer‐sized Al 2 O 3 platelets were self‐oriented in the edge area of the extrudate and significantly aligned to the extrusion direction while the platelets in the middle of the extrudate were mostly randomly oriented . The edge area also showed a relatively denser structure with less porosity than the center area.…”

Section: Recent Trends In Ceramic Robocastingmentioning

confidence: 91%

“…The fact that shearing or extrusion process out of the small nozzle can easily induce anisotropic ceramic platelet arrangement is very beneficial and promising for any future self‐shaping process especially by ceramic robocasting. A more detailed study can be directed at the sintering study of the structures reported by Kokkinis et al, Fu et al, and Feilden et al to confirm the self‐shape shifting behavior after sintering.…”

Section: Recent Trends In Ceramic Robocastingmentioning

confidence: 92%

“…When compared to the work reported by Ferrand et al that employed magnetized Al 2 O 3 platelets and external magnetic field for particles alignment, the proposed method by Fu et al and Feilden et al allows controlling the heterogeneity textured microstructure smoothly by merely adjusting the rheological behavior (i.e., paste composition) as well as processing parameters (i.e., extrusion velocity and printing speed) without the need for additional magnetic field or magnetically active coating on the ceramic surface to induce changes in platelet orientation. It is also important to highlight that neither Fu et al, Feilden et al, Kokkinis et al, nor Ferrand et al proposed methods will guarantee fully dense bulk ceramic structures after sintering. Also, not all ceramic materials can be easily fabricated in the form of micrometer‐sized platelets; such a method is therefore very subjective to the availability of different kinds of limited micrometer‐sized ceramic platelets.…”

Section: Recent Trends In Ceramic Robocastingmentioning

confidence: 99%

“…Also, not all ceramic materials can be easily fabricated in the form of micrometer‐sized platelets; such a method is therefore very subjective to the availability of different kinds of limited micrometer‐sized ceramic platelets. However, the work by Fu et al and Feilden et al opens up many new exciting opportunities ahead. The fact that shearing or extrusion process out of the small nozzle can easily induce anisotropic ceramic platelet arrangement is very beneficial and promising for any future self‐shaping process especially by ceramic robocasting.…”

Section: Recent Trends In Ceramic Robocastingmentioning

confidence: 99%

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Ceramic Robocasting: Recent Achievements, Potential, and Future Developments

2018

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Additive manufacturing (AM) of ceramic materials has attracted tremendous attention in recent years, due to its potential to fabricate suitable advanced ceramic structures for various engineering applications. Robocasting, a subset of ceramic AM, is an ideal technique for constructing fine and dense ceramic structures with geometrically complex morphology. With the freedom and convenience to deposit various materials within any 3D spatial position, ceramic robocasting opens up unlimited opportunities, which are otherwise hardly attainable from other AM techniques. Here, a summary of the recent progress on the fabrication of single and multi‐ceramic structures by robocasting is provided, as well as the prospects of achieving shapeable ceramic structures. The current challenges in ceramic robocasting and an outlook on its development, especially toward the fabrication of self‐shaping ceramic structures, are also discussed.

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Controllable Ceramic Green‐Body Configuration for Complex Ceramic Architectures with Fine Features

Zhang

Peng

Borayek

et al. 2019

Adv Funct Materials

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Fabrication of dense ceramic articles with intricate fine features and geometrically complex morphology by using a relatively simple and the cost‐effective process still remains a challenge. Ceramics, either in its green‐ or sintered‐form, are known for being hard yet brittle which limits further shape reconfiguration. In this work, a combinatorial process of ceramic robocasting and photopolymerization is demonstrated to produce either flexible and/or stretchable ceramic green‐body (Flex‐Body or Stretch‐Body) that can undergo a postprinting reconfiguration process. Secondary shaping may proceed through: i) self‐assembly‐assisted shaping and ii) mold‐assisted shaping process, which allows a well‐controlled ceramic structure morphology. With a proposed well‐controlled thermal heating process, the ceramic Sintered‐Body can achieve >99.0% theoretical density with good mechanical rigidity. Complex and dense ceramic articles with fine features down to 65 μm can be fabricated. When combined with a multi‐nozzle deposition process, i) self‐shaping ceramic structures can be realized through anisotropic shrinkage induced by suspensions' composition variation and ii) technical and functional multiceramic structures can be fabricated. The simplicity of the proposed technique and its inexpensive processing cost make it an attractive approach for fabricating geometrically complex ceramic articles with unique macrostructures, which complements the existing state of‐the‐art ceramic additive manufacturing techniques.

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Micro- and macroscopic design of alumina ceramics by robocasting

Cited by 46 publications

References 28 publications

Electromechanical Properties of Robocasted Barium Titanate Ceramics

Electromechanical Properties of Robocasted Barium Titanate Ceramics

Ceramic Robocasting: Recent Achievements, Potential, and Future Developments

Controllable Ceramic Green‐Body Configuration for Complex Ceramic Architectures with Fine Features

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