Coating die design for suspensions

Lin, Yu-Yan; Wu, Ping‐Yao; Liu, Ta‐Jo; Hsu, Tong C.; Tiu, Carlos

doi:10.1002/apj.1636

Cited by 4 publications

(2 citation statements)

References 30 publications

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“…Particle laden flows in processes with free surfaces experience particle growth near the free surface and static contact lines in slide coating . Particle deposition has also been reported in similar coating dies . This research attempts to examine some fundamental questions about motion and agglomeration patterns of suspensions in the complex flow field of slot die coating system with moving and/or free surfaces by fundamentally studying particle–particle and particle–fluid interactions.…”

Section: Introductionmentioning

confidence: 99%

Coupled fluid‐particle modeling of a slot die coating system

Akbarzadeh

Hrymak

2016

AIChE Journal

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This work seeks to develop a fundamental understanding of particle motion in the slot die coating process through studying the interaction of forces between particles, with the die walls and the fluid phase. Coupled computational fluid dynamics and the discrete element method is employed for evaluating the motion of individual suspended particles near moving surfaces in a complex three-dimensional flow field, motivated by the flow of particle laden fluid in a slot die coating system, including the presence of free surfaces. Overall, the particles follow the flow streamlines and their final position in the coating depends on the initial entry region of the particles. Particles experiencing adhesion with each other agglomerate in the low velocity regions of the coating gap, and have long residence times near the edge of the die at the end of the feed slot in the coating gap.

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Section: Introductionmentioning

confidence: 99%

Coupled fluid‐particle modeling of a slot die coating system

Akbarzadeh

Hrymak

2016

AIChE Journal

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“…Little work has been carried out explicitly on premetered slurry coating devices for additive manufacturing [28]. However, investigations have been conducted into coating methods [8] and coater designs for suspensions [9] in related disciplines.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and optimisation of a slurry-based layer casting process in additive manufacturing using multiphase simulations and spatial reconstruction

Erhard

Seidel

Vogt

et al. 2021

Prod. Eng. Res. Devel.

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Slurry-based 3D printing allows ceramic green bodies to be fabricated at high packing densities. In contrast to powder-based binder jetting, full densification of printed parts can be achieved in a subsequent sintering step as fine particles dispersed in a suspension are cast and compacted. Slurry-based 3D printing is thus expected to overcome the application limits of the powder-based alternative in metal casting in terms of unfavorable properties like high surface roughness, low density and low mechanical strength. To ensure stress-free drying and therefore high qualities of the compounds made in layers, it is crucial to fabricate single layers with a high level of homogeneity. This paper presents a CFD model based on the open-source simulation environment OpenFOAM to predict the resulting homogeneity of a cast slurry layer with defined parameter sets or coater geometries using the Volume-Of-Fluid method. Moreover, a novel method of spatial reconstruction is proposed to evaluate the surface quality of layers on a minimised computional demand. By comparing the results of the simulation with the real macroscopic behaviour determined in experiments, the approach is found to be a useful tool for suggesting suitable parameters and coater geometries for processing slurries. A precise reconstruction of the outline of the coating area with different process parameters and an approximate prediction of the effect on surface roughness was achieved.

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Experimental studying on development of slurry-layer casting system for additive manufacturing of ceramics

Yen

2014

Int J Adv Manuf Technol

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Coating die design for suspensions

Cited by 4 publications

References 30 publications

Coupled fluid‐particle modeling of a slot die coating system

Coupled fluid‐particle modeling of a slot die coating system

Evaluation and optimisation of a slurry-based layer casting process in additive manufacturing using multiphase simulations and spatial reconstruction

Experimental studying on development of slurry-layer casting system for additive manufacturing of ceramics

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