Influence of Vacuum Debinding Temperature on Microstructure and Mechanical Properties of Three-Dimensional-Printed Alumina via Stereolithography

Li, He; Liu, Yongsheng; Wang, Jing; Zeng, Qingfeng; Hu, Kehui; Lu, Zongqing

doi:10.1089/3dp.2019.0060

Cited by 21 publications

(6 citation statements)

References 46 publications

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“…Next, the slurries were defoamed in vacuum for 10 min and used for 3D printing. 22 − 25 The exposure dose was set to 3 mW/cm 2 , single layer exposure time was 8 s, and layer thickness was 100 μm.…”

Section: Methodsmentioning

confidence: 99%

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Effects of Solvent Debinding on the Microstructure and Properties of 3D-Printed Alumina Ceramics

et al. 2020

ACS Omega

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Solvents assist in the debinding of stereolithography-based 3D-printed alumina green bodies. The green bodies subsequently undergo thermal debinding and sintering to obtain alumina ceramics. In this study, several solvents were tested, including polyethylene glycol, oxalic acid, ammonium hydroxide, ethyl alcohol, methyl methacrylate, butyl acetate, dimethyl carbonate, methanol, ethyl acetate, and sec -butyl alcohol. The tested solvents during the debinding process showed different effects on microstructure and properties of 3D-printed alumina ceramics due to the variable aspects of their solubility toward the binders. The microstructure of the samples changed significantly after green bodies underwent solvent debinding, thermal debinding, and sintering, leading to loose spongy structures, porous aggregates, and compact structures, respectively. Shrinkage, bulk density, and open porosity changed slightly due to the debinding function of different solvents. Polyethylene glycol-impregnated samples displayed the minimum shrinkage in length direction (5.3%). Ethyl alcohol-impregnated sample showed minimum shrinkage in width (4.8%) and height (11.5%) directions. Ammonium hydroxide-impregnated samples exhibited minimum bulk density (2.8 g/cm 3 ) and maximum open porosity (28.3%). Dimethyl carbonate-impregnated samples presented minimum flexural strength (32.6 MPa), and oxalic acid-impregnated samples revealed maximum flexural strength (63.4 MPa). In sum, the as-obtained ceramics would be used as ceramic cores for hollow blades in aircraft engines due to their high open porosity and moderate flexural strength.

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Section: Methodsmentioning

confidence: 99%

“…The obtained alumina ceramic slurries were then ball-milled for 2 h in a planet-type grinding mill at the rate of 400 rpm. Next, the slurries were defoamed in vacuum for 10 min and used for 3D printing. − The exposure dose was set to 3 mW/cm 2 , single layer exposure time was 8 s, and layer thickness was 100 μm.…”

Section: Methodsmentioning

confidence: 99%

Effects of Solvent Debinding on the Microstructure and Properties of 3D-Printed Alumina Ceramics

et al. 2020

ACS Omega

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“…It is generally believed that the shrinkage in the height direction is more significant than that in the length and width directions. Some scholars thought that due to the existence of the interlayer interface, the resin distribution in the height direction was more than that between the layers, and the shrinkage space of the particles after degreasing was also larger [34]. In addition, different curing depth conditions in height, width, and length also led to different shrinkage in different directions.…”

Section: Effect Of Particle Size On Anisotropic Shrinkage Of Alumina Ceramics Formed By Stereolithographymentioning

confidence: 99%

The Effect of Particle Distribution to the Sintering Properties of Al2o3 Ceramic Formed by Stereolithography

Qian¹,

Hu²,

Wang³

et al. 2021

Preprint

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This work studied the effect of particle size gradation on the structure and sintering properties of alumina ceramics manufactured by stereolithography after sintering, including room temperature flexural strength, sintering shrinkage, porosity and microstructure morphology. Seven different particle size gradations from coarse to fine were studied, and each particle size gradation was coarse particles: fine particles=6:4. With the increase of the sintering temperature, the degree of sintering and the bonding strength of the interface increased, the shrinkage in all directions, and the bending strength and the closed porosity increased, the open porosity decreased. For the same sintering temperature, the flexural strength and shrinkage in all directions decreased and the open porosity increased with the increase of particle size. The ratio of the height (4mm) shrinkage of each particle size to the length (50mm) shrinkage is about 1.5 times. Due to the presence of the lateral edge resin layer, the width shrinkage of the coarse particles was different from the length shrinkage but closer to the height shrinkage. The width shrinkage gradually approached the length shrinkage as the particle size decreased. When the gradation ratio is the same, and the particle size was ten times different (30μm/5μm, 3μm/0.5μm; 20μm/3μm, 2μm/0.3μm), there was a big difference. When the sintering temperature was above 1500℃, the differences of sintering properties of the comparison groups are 2~10 times. Considering the alumina-based ceramic core, 20/3 has been evaluated comprehensively. It maintains excellent flexural strength and porosity under the condition of slight shrinkage.

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“…Works by Santoliquido et al [17] and Shuai et al [18] have detailed the use of DLP-stereolithography for the fabrication of Al 2 O 3 architectures with fine and complex lattice structures. However, it is worth noting that the presence of photosensitive resin in printed green parts and its removal during the debinding process can result in a large porosity in the debound parts [19], which can lengthen the pathways for substance migration at high temperatures and be an obstacle for the sintering densification [20,21]. For this reason, an increased sintering temperature is required for the debound samples to form dense ceramic parts.…”

Section: Introduction mentioning

confidence: 99%

Microstructure refinement-homogenization and flexural strength improvement of Al2O3 ceramics fabricated by DLP-stereolithography integrated with chemical precipitation coating process

Nie

Sheng

et al. 2021

J Adv Ceram

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In this study, the chemical precipitation coating (CP) process was creatively integrated with DLP-stereolithography based 3D printing for refining and homogenizing the microstructure of 3D printed Al2O3 ceramic. Based on this novel approach, Al2O3 powder was coated with a homogeneous layer of amorphous Y2O3, with the coated Al2O3 powder found to make the microstructure of 3D printed Al2O3 ceramic more uniform and refined, as compared with the conventional mechanical mixing (MM) of Al2O3 and Y2O3 powders. The grain size of Al2O3 in Sample CP is 64.44% and 51.43% lower than those in the monolithic Al2O3 ceramic and Sample MM, respectively. Sample CP has the highest flexural strength of 455.37±32.17 MPa, which is 14.85% and 25.45% higher than those of Samples MM and AL, respectively; also Sample CP has the highest Weibull modulus of 16.88 among the three kinds of samples. Moreover, the fine grained Sample CP has a close thermal conductivity to the coarse grained Sample MM because of the changes in morphology of Y3Al5O12 phase from semi-connected (Sample MM) to isolated (Sample CP). Finally, specially designed fin-type Al2O3 ceramic heat sinks were successfully fabricated via the novel integrated process, which has been proven to be an effective method for fabricating complex-shaped Al2O3 ceramic components with enhanced flexural strength and reliability.

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Influence of Vacuum Debinding Temperature on Microstructure and Mechanical Properties of Three-Dimensional-Printed Alumina via Stereolithography

Cited by 21 publications

References 46 publications

Effects of Solvent Debinding on the Microstructure and Properties of 3D-Printed Alumina Ceramics

Effects of Solvent Debinding on the Microstructure and Properties of 3D-Printed Alumina Ceramics

The Effect of Particle Distribution to the Sintering Properties of Al2o3 Ceramic Formed by Stereolithography

Microstructure refinement-homogenization and flexural strength improvement of Al2O3 ceramics fabricated by DLP-stereolithography integrated with chemical precipitation coating process

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