Technical Development of Slurry Three-Dimensional Printer

Jiang, Cho‐Pei; Hsu, Huang Jan; Lee, Shyh Yuan

doi:10.1088/1757-899x/235/1/012010

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…The Arrhenius equation is deemed to be increasingly more accurate as the material approaches its liquidus temperature, such as at high sintering temperatures. The model evaluates the relative density at every increment as per the mass conservation Equation ( 7) based on the current values of the deformations calculated via the constitutive Equations from (1) to (6). Hence, the relative density value is updated and continuously changes through the simulation, changing the material properties and affecting the subsequent deformations that determine the new value of relative density for the following increment.…”

Section: Numerical Modellingmentioning

confidence: 99%

“…Since DLP machines are easier to maintain than other manufacturing machines and are relatively cheaper while guaranteeing optimal outcomes in terms of accuracy, resolution, final density, and mechanical performance, DLP has been proved to be one of the best candidates for the AM of ceramic parts. It also exhibits higher accuracy when it comes to postprocessed components compared with other slurry-based technologies, offering the best quality-to-cost ratio [6].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Sintering of DLP Printed Alumina Ceramics

et al. 2022

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Digital Light Processing (DLP) technology exhibits the capability of producing components with complex structures for a variety of technical applications. Postprocessing of additively printed ceramic components has been shown to be an important step in determining the final product resolution and mechanical qualities, particularly with regard to distortions and resultant density. The goal of this research is to study the sintering process parameters to create a nearly fully dense, defect-free, ceramic component. A high-solid-loading alumina slurry with suitable rheological and photopolymerisable characteristics for DLP was created. TGA/DSC analysis was used to estimate thermal debinding parameters. The sintering process of the debound parts was studied by employing a numerical model based on thermo-viscoelasticity theory to describe the sintering process. The validated Finite Element Modelling (FEM) code was capable of predicting shrinkage and relative density changes during the sintering cycle, as well as providing meaningful information on the final shape. Archimedes’ principle and scanning electron microscope (SEM) were used to characterise the sintered parts and validate the numerical model. Samples with high relative density (>98.5%) were produced and numerical data showed close matches for predicted shrinkages and relative densities, with less than 2% mismatch between experimental results and simulations. The current model may allow to effectively predict the properties of alumina ceramics produced via DLP and tailor them for specific applications.

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Section: Numerical Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Sintering of DLP Printed Alumina Ceramics

et al. 2022

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“…The fabrication speed is slow and comparable to the FDM. The digital light projection (DLP) [3][4] and liquid crystal display (LCD) [5] have used in SL system as the light engine to instead of single laser scan for forming a layer, also known as the layer-curing type, in a few seconds. The fabrication speed becomes faster than the FDM.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Slurry Printing Technology in Ceramic and Metal Application

Jiang

Hentihu

Lei

et al. 2020

SSP

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Vat photopolymerization is one of additive manufacturing and also known as photo-curable three-dimensional printing technology. It uses light energy with the proper wavelength to expose on the liquid photo-curable resin inducing the photopolymerization process and resulting in solidification layer-by-layer. The building method is classified into two ways: free-surface and constrained-surface. The advantage and disadvantage of both methods are described and analysed according to the different material property and requirement. The basic composition for photo-curable resin consists of photo-initiator and monomer. Adding powder into photo-curable resin makes the photo-curable slurry. Literatures report that high density powder such as zirconia oxide or Inconel 718 is suitable for free-surface building method because of poor suspension. However, the volume percentage in the slurry is less than 50% causing the higher shrinkage ratio and inaccuracy after sintering process. The coupling agent may increase the suspension of powder in slurry but experimental result shows that it still cannot improve the success rate in the constrained-surface building method. Therefore, this study proposes a combination method to overcome the difficulty of making high density ceramic or metal part. In addition, the sintering process is a key factor to obtain the high dense part with no crack occurrence and desirable microstructure. The optimized sintering parameters for zirconia oxide and Inconel 718 are also introduced.

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“…The smaller the particle size the higher suspension capacity increases. 3DSP have two forming methods including (a) upper-down and (b) bottom-up [4] as shown in Figure 1. Suspension capacity of particle in slurry is not only the factor of success rate in building green body but also of mass percentage [5].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of High Density Ceramic Powder for Increasing Suspension Capacity in Three-Dimensional Printing Application

Hsu

Lee

Chang

et al. 2018

MSF

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Three-dimensional slurry printing is a promising tool for making ceramic object but it limits in high dense ceramic powder because of poor suspension capacity. This study uses zirconia powder with an average diameter of 2 μm because its density is 5.67 g/cm3. A treatment protocol is proposed to improve the suspension capacity of zirconia powder including the ball milling, surface modification and resin blending. Experimental results show that adding 1% of isostearyl titanate, a coupling agent, for surface modification can enhance the lipophilicity of zirconia powder. Mixing surface modification powder in resin with a weight ratio of 7:3 and carrying on ball milling with 100 RPM for 6 hours can obtain the diameter of powder less than 400 nm. As a result, the zirconia slurry can obtain good suspension capacity which is over 48 hours.

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Technical Development of Slurry Three-Dimensional Printer

Cited by 3 publications

References 11 publications

Numerical Simulation of Sintering of DLP Printed Alumina Ceramics

Numerical Simulation of Sintering of DLP Printed Alumina Ceramics

Three-Dimensional Slurry Printing Technology in Ceramic and Metal Application

Surface Modification of High Density Ceramic Powder for Increasing Suspension Capacity in Three-Dimensional Printing Application

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