Influence of platelet content on the fabrication of colloidal gels for robocasting: Experimental analysis and numerical simulation

Lorenz, Mylena; Dietemann, Bastien; Wahl, Larissa; Bierwisch, Claas; Kraft, Torsten; Kruggel‐Emden, Harald; Travitzky, Nahum

doi:10.1016/j.jeurceramsoc.2019.10.044

Cited by 24 publications

(18 citation statements)

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“…A major overarching problem that hinders the development of ceramics AM is the nearly complete lack of modeling efforts, although some promising published results of modeling and simulations have emerged recently. [66][67][68][69] The community envisions modeling to benefit almost every aspect of the AM process, from the selection of feedstock characteristics and build parameters to the optimization of debinding and sintering schedules per a specific product. Development of computational approaches and software tools, which would enable predictive simulations of a complete workflow even for a few selected AM methods, like SLA or DIW, is perceived as a high priority.…”

Section: Needsmentioning

confidence: 99%

Section: Research and Measurement Needsmentioning

confidence: 99%

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Materials research & measurement needs for ceramics additive manufacturing

2020

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We report on a recent workshop dedicated to additive manufacturing (AM) of ceramics that was held at the National Institute of Standards and Technology (NIST) in November 2019. This two‐day all‐invited meeting brought together experts from industry, government agencies and academia to review the state of the field and identify the most pressing applied materials research and metrology issues which, if addressed, could accelerate the incorporation of AM methods into commercial ceramic manufacturing. Besides the AM technologies, the discussions included consideration of the necessary post‐processing steps. We highlight some of the successes and challenges for the adoption of ceramics AM on an industrial scale, as viewed by the workshop participants. We also propose actions for the ceramic community to facilitate the wider commercialization of these fabrication methods.

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Section: Needsmentioning

confidence: 99%

Section: Research and Measurement Needsmentioning

confidence: 99%

Materials research & measurement needs for ceramics additive manufacturing

2020

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“…Lorenz et al reported a similar effect on G ′ eq for pastes of equiaxed alumina and alumina platelets. 37 In their work, they showed that G ′ eq decreased by an order of magnitude when the platelet fraction increased from 10 to 15 vol%. eq and yield stress of 1000 kPa and 1370 Pa, respectively.…”

Section: Effect Of Anisotropic Particles On Paste Rheologymentioning

confidence: 96%

“…29 Increasing the volume fraction of platelet particles in pastes containing more than 20 vol% (dry powder basis) platelets has been reported to decrease the storage modulus and yield stress. 37 PIN-PMN-PT (Pb(In 1/2 Nb 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 ) was chosen as a model system for this study because textured, lead-based piezoelectric ceramics have much better properties than polycrystalline ceramics and approach those of single crystal analogs. Also, PIN-PMN-PT aqueous dispersion chemistry is representative of other aqueous-processed lead-based piezoelectric ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Dispersion and rheology for direct writing lead‐based piezoelectric ceramic pastes with anisotropic template particles

et al. 2020

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Controlling the rheology of direct writing pastes is essential for producing high quality printed ceramics. Ceramic pastes were formulated to explore the relation between surface chemistry and rheology of complex pastes of Pb(In1/2Nb1/2)O3‐Pb(Mg1/3Nb2/3)O3‐PbTiO3 (PIN‐PMN‐PT) powder, large BaTiO3 (BT) platelet particles, and a commercial poly(acrylic) acid‐based binder system. Zeta potential of the ceramic powder, the conformation of the poly(acrylic) acid, and the effect of these factors on rheology were evaluated as a function of suspension pH. Effective dispersion and amenable rheology for direct writing were achieved at mixing pH 5. Additions of 0.3 to 2.6 vol% BT tabular particles dramatically altered the rheology of the pastes due to the shear alignment of the BT particles. Powder‐organic interactions and the size and concentration of BT platelet particles can be tailored to direct write either space‐filling filaments to form dense ceramics or non‐flowing filaments to form spanning ceramic structures.

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Enhanced Thermal and Mechanical Properties of 3D Printed Highly Porous Structures Based on γ‐Al₂O₃ by Adding Graphene Nanoplatelets

Moreno‐Sanabria

Ramírez

Osendi

et al. 2022

Adv Materials Technologies

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logically active materials and, recently, in other emerging applications like flame retardants for polymers, quasi-solid electrolytes, or antimicrobial agents. [3] In particular, macroporous alumina with hierarchical pore structure, high surface area, and narrow pore size distribution are highly desirable for heterogeneous catalysts, as for example, hydrotreating catalysts used for heavy oils. [6][7][8] In this way, the catalytic performance can be enhanced through the development of suitable macrostructures of the catalysts, which depends on the support, reducing the mass transfer resistance, improving the reaction efficiency and increasing the lifetime of the catalysts. In this context, the additive manufacturing (AM) techniques allow developing highly hierarchical 3D structures that include channels of controlled size and shape in the millimeter scale, while porosity at meso-and micro-scales within the struts can be tailored using different strategies. Direct ink writing (DIW), an AM technology, allows building customized porous scaffolds with precise intricate geometries of a wide range of materials by computer controlling the scaffold parameters and adjusting the ink properties. DIW presents some drawbacks as compared to other AM technologies employed for porous ceramic scaffolds, such as stereolithography, in particular, poor surface quality of the 3D printed structures, which can be greatly improved by using smaller nozzle diameters, and, especially, the limitation to directly produce scaffolds with spanning, overhanging, and floating features that would require employing sacrificial supporting materials. [9][10][11] Main concerns for the application of the 3D printed macroporous γ-Al 2 O 3 structures are its reduced mechanical resistance that may restrain their possible applications, and its limited heat transfer capability associated to the high porosity, which is particularly important in the case of 3D printed porous materials with applications in fields like catalysis, energy production and storage, and for thermal management as heat exchangers and heat sinks. [12][13][14][15][16][17][18][19][20] The incorporation of welldispersed graphene nanostructures, 2D carbon allotropes with outstanding electronic and physiochemical properties, [21] into the γ-Al 2 O 3 matrix can increase both the mechanical and the thermal performance of 3D printed γ-Al 2 O 3 structures [22] and One of the main challenges to widen the potential applications of 3D printed highly porous ceramic structures in catalysis, energy storage or thermal management resides in the improvement of both their mechanical resistance and thermal conductivity. To achieve these goals, highly hierarchical γ-alumina (γ-Al 2 O 3 ) scaffolds containing up to 18 vol% of graphene nanoplatelets (GNP), including channels of controlled size and shape in the millimeter scale and meso-porosity within the rods, are developed by robocasting from boehmite-based aqueous inks without other printing additives. These 3D structures exhibit high porosity (85%) and spe...

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Influence of platelet content on the fabrication of colloidal gels for robocasting: Experimental analysis and numerical simulation

Cited by 24 publications

References 1 publication

Materials research & measurement needs for ceramics additive manufacturing

Materials research & measurement needs for ceramics additive manufacturing

Dispersion and rheology for direct writing lead‐based piezoelectric ceramic pastes with anisotropic template particles

Enhanced Thermal and Mechanical Properties of 3D Printed Highly Porous Structures Based on γ‐Al₂O₃ by Adding Graphene Nanoplatelets

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Influence of platelet content on the fabrication of colloidal gels for robocasting: Experimental analysis and numerical simulation

Cited by 24 publications

References 1 publication

Materials research & measurement needs for ceramics additive manufacturing

Materials research & measurement needs for ceramics additive manufacturing

Dispersion and rheology for direct writing lead‐based piezoelectric ceramic pastes with anisotropic template particles

Enhanced Thermal and Mechanical Properties of 3D Printed Highly Porous Structures Based on γ‐Al2O3 by Adding Graphene Nanoplatelets

Contact Info

Product

Resources

About

Enhanced Thermal and Mechanical Properties of 3D Printed Highly Porous Structures Based on γ‐Al₂O₃ by Adding Graphene Nanoplatelets