Dispersion and stability of SiC ceramic slurry for stereolithography

Ding, Guojiao; He, Rujie; Zhang, Keqiang; Xia, Min; Feng, Chengwei; Fang, Daining

doi:10.1016/j.ceramint.2019.10.203

Cited by 151 publications

(56 citation statements)

References 51 publications

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“…These are some of the challenges currently faced by researchers in this research area. To address these, for example, Ding et al [30,31] managed to prepare gray-colored SiC ceramic slurries suitable for DLP 3D printing by increasing the exposure energy.…”

Section: Introduction mentioning

confidence: 99%

Photopolymerization-based additive manufacturing of ceramics: A systematic review

et al. 2021

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Conversion of inorganic-organic frameworks (ceramic precursors and ceramic-polymer mixtures) into solid mass ceramic structures based on photopolymerization process is currently receiving plentiful attention in the field of additive manufacturing (3D printing). Various techniques (e.g., stereolithography, digital light processing, and two-photon polymerization) that are compatible with this strategy have so far been widely investigated. This is due to their cost-viability, flexibility, and ability to design and manufacture complex geometric structures. Different platforms related to these techniques have been developed too, in order to meet up with modern technology demand. Most relevant to this review are the challenges faced by the researchers in using these 3D printing techniques for the fabrication of ceramic structures. These challenges often range from shape shrinkage, mass loss, poor densification, cracking, weak mechanical performance to undesirable surface roughness of the final ceramic structures. This is due to the brittle nature of ceramic materials. Based on the summary and discussion on the current progress of material-technique correlation available, here we show the significance of material composition and printing processes in addressing these challenges. The use of appropriate solid loading, solvent, and preceramic polymers in forming slurries is suggested as steps in the right direction. Techniques are indicated as another factor playing vital roles and their selection and development are suggested as plausible ways to remove these barriers.

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Section: Introduction mentioning

confidence: 99%

Photopolymerization-based additive manufacturing of ceramics: A systematic review

et al. 2021

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“…Currently, measurements of particle size distribution 8–10 and rheological properties 1,11–14 as well as sedimentation tests 13–15 are used to evaluate the particle dispersion state in a slurry, and the optimization of the slurry condition is managed using these methods. However, by comparison with these slurry evaluation results, some unexpected results suggested that the slurry conditions whose particles appeared to be most dispersed differed depending on the evaluation method 16,17 . In addition, the densest green body was not necessarily obtained by the slurry with the most dispersed particles identified via the slurry evaluation 18–23 .…”

Section: Introductionmentioning

confidence: 93%

Effect of medium condition change on green body density during casting and drying

Iwata

Yamada

Mori

2020

Int J Applied Ceramic Tech

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The present study examined whether the optimum slurry conditions in which the green body with the highest packing fraction was fabricated were the same regardless of whether tape or slip casting methods were used. Additionally, we investigated the optimum slurry evaluation method to predict the packing fraction of each green body. Specifically, aqueous dense alumina slurries, whose particle dispersion state was changed by varying pH and the amount of dispersant additive, were prepared. After changing the pH, the optimum slurry conditions were achieved regardless of the casting method. The most suitable amount of additive dispersant differed due to the changing solution conditions during the casting and drying process; the medium of the slurry permeated into the plaster during slip casting and dried on the substrate during tape casting. Thus, in slip casting, non‐adsorbed polymers could also be permeated. Hence, it is crucial for slurry evaluation to predict the packing fraction of the slip cast body. A sedimentation test, which involved particle condensation as well as casting, was valid for the green sheet. Conversely, it was experimentally shown that the constant pressure filtration test, which involved the permeation of the medium in addition to particle condensation, was suitable for slip casting.

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“…Higher viscosities prevent the recoating of constant and homogeneous layers, and therefore, defects can be generated when a surface tension balance is not achieved 8 . Moreover, stability is a key factor in the performance of ceramic slurries for VP additive manufacturing 4, 9,10 .…”

Section: Introductionmentioning

confidence: 99%

3Y-TZP DLP Additive Manufacturing: Solvent-free Slurry Development and Characterization

Camargo

Erbereli

Taylor³

et al. 2021

Mat. Res.

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Vat photopolymerization (VP) stands out among ceramic additive manufacturing processes for its ability to print sub-100 micrometer complex features. One of the main challenges of this process is the preparation of a homogeneous and stable ceramic slurry with a high solid load and low viscosity. In this work, different dispersants and resins were tested, aiming to provide a solvent-free slurry suitable for DLP additive manufacturing. Disperbyk-111 and PEGDA 250 stood out in the tests, providing a 40 vol% ceramic slurry with no noticeable sedimentation and viscosity of 2.3 Pa.s at 30 s -1 despite the relatively high specific surface area (15 m 2 /g) of the 3Y-TZP powder used compared to powders usually used for VP slurries. The adsorption of Disperbyk-111 on ceramic particles surface was investigated by FTIR. Finally, ceramic bodies were 3D printed, debound and sintered at 1500 ºC for 2 h, confirming the ability to manufacture detailed dense ceramic parts.

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Dispersion and stability of SiC ceramic slurry for stereolithography

Cited by 151 publications

References 51 publications

Photopolymerization-based additive manufacturing of ceramics: A systematic review

Photopolymerization-based additive manufacturing of ceramics: A systematic review

Effect of medium condition change on green body density during casting and drying

3Y-TZP DLP Additive Manufacturing: Solvent-free Slurry Development and Characterization

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