Lithography-based ceramic manufacturing (LCM) – Viscosity and cleaning as two quality influencing steps in the process chain of printing green parts

Schwarzer, Eric; Götz, Michael; Markova, Darja; Stafford, Dalton R.; Scheithauer, Uwe; Moritz, Tassilo

doi:10.1016/j.jeurceramsoc.2017.05.046

Cited by 84 publications

(45 citation statements)

References 12 publications

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“…Due to their high photopolymerizable reactivity and conversion, various kinds of acrylates are widely chosen as photocurable monomers and oligomers. 7 (b) A photoinitiator. The absorptivity of photoinitiator should be tuned to match with the ultraviolet or visible light wavelength, so that it can generate free radicals to initiate the polymerization of the monomer system.…”

Section: Introductionmentioning

confidence: 99%

Dispersion and properties of zirconia suspensions for stereolithography

Zhong

Zhang

et al. 2019

Int J Applied Ceramic Tech

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Stereolithography is an attractive technique for the fabrication of complex‐shaped ceramic components with high dimensional accuracy. One of the challenges in this technology is the development of high solid loading, low viscosity photosensitive ceramic suspension. In this study, the dispersion of zirconia in photocurable resin and the slurry properties were intensively investigated. Rheological measurements showed that DISPERBYK‐103 proved to be an effective dispersant. 42 vol% ZrO2 suspension was successfully prepared using 3.5 wt% DISPERBYK‐103 as the dispersant, with a suitable viscosity (4.88 Pa·s) below the maximum allowable viscosity value (5 Pa·s) for stereolithography applications. The adsorption behavior of DISPERBYK‐103 on the surface of zirconia powders was characterized by TG and FT‐IR, confirming the dispersion effect of dispersant. Contact angle measurements were also conducted to show that the adsorption of DISPERBYK‐103 could help to improve the wettability between powder and photocurable resin. Results showed that DISPERBYK‐103 was effective for the preparation of suitable slurries for the development of ZrO2 ceramics through stereolithography.

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Section: Introductionmentioning

confidence: 99%

Dispersion and properties of zirconia suspensions for stereolithography

Zhong

Zhang

et al. 2019

Int J Applied Ceramic Tech

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“…This could be an issue particularly during the production of delicate geometries. During 3D printing, defects would be formed due to forces that are too high for the dispersion [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet Lithography-Based Ceramic Manufacturing (UV-LCM) of the Aluminum Nitride (AlN)-Based Photocurable Dispersions

et al. 2020

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In this work, three-dimensional (3D) shaping of aluminum nitride (AlN) UV-curable dispersions using CeraFab 7500 device equipped with the light engine emitting 365 nm wavelength (a UV-LCM device) is presented. The purpose of this study was the shaping of AlN pieces with microchannels for the future potential use as microchannel heat exchangers. The dispersions were characterized by the means of the particle size distribution, rheological measurements, and the cure depth evaluation. In shaping via UV-LCM, we applied dispersions containing 40 vol % solid load and different types of photoinitiators and their concentrations, as well as different settings of the printing parameters. Cuboidal plates with channels and cylindrical 3D structures were fabricated, debound, and sintered. For comparing ceramics properties, reference samples were prepared via uniaxial and cold isostatic pressing, using the same powder mixture as in the dispersions, and later sintered. The thermal conductivity of the sintered specimens was calculated, based on density and thermal diffusivity measurements.

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“…The LCM technology impresses with a very high resolution (wall thickness down to 100 μm possible) [16] and very good surface properties (R a <1μm) of the sintered components. The challenges are the small building area ((76 Â43 Â 150) mm 3 ) and the low productivity, both resulting in relatively high manufacturing costs as well as the cleaning and the debinding process for the green components [17].…”

Section: Lithography-based Ceramic Manufacturing (Lcm)mentioning

confidence: 99%

Potentials and Challenges of Additive Manufacturing Technologies for Heat Exchanger

Scheithauer¹,

Kordass²,

Noack³

et al. 2019

Advances in Heat Exchangers

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The rapid development of additive manufacturing (AM) technologies enables a radical paradigm shift in the construction of heat exchangers. In place of a layout limited to the use of planar or tubular starting materials, heat exchangers can now be optimized, reflecting their function and application in a particular environment. The complexity of form is no longer a restriction but a quality. Instead of brazing elements, resulting in rather inflexible standard components prone to leakages, with AM, we finally can create seamless integrated and custom solutions from monolithic material. To address AM for heat exchangers we both focus on the processes, materials, and connections as well as on the construction abilities within certain modeling and simulation tools. AM is not the total loss of restrictions. Depending on the processes used, delicate constraints have to be considered. But on the other hand, we can access materials, which can operate in a much wider heat range. It is evident that conventional modeling techniques cannot match the requirements of a flexible and adaptive form finding. Instead, we exploit biomimetic and mathematical approaches with parametric modeling. This results in unseen configurations and pushes the limits of how we should think about heat exchangers today.

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Lithography-based ceramic manufacturing (LCM) – Viscosity and cleaning as two quality influencing steps in the process chain of printing green parts

Cited by 84 publications

References 12 publications

Dispersion and properties of zirconia suspensions for stereolithography

Dispersion and properties of zirconia suspensions for stereolithography

Ultraviolet Lithography-Based Ceramic Manufacturing (UV-LCM) of the Aluminum Nitride (AlN)-Based Photocurable Dispersions

Potentials and Challenges of Additive Manufacturing Technologies for Heat Exchanger

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