Microstructure and properties of 3D-printed alumina ceramics with different heating rates in vacuum debinding

Li, He; Liu, Yongsheng; Zeng, Qingfeng; Hu, Kehui; Liang, Jingjing; Lu, Zongqing

doi:10.1007/s12598-020-01372-x

Cited by 27 publications

(16 citation statements)

References 38 publications

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“…It also forms large portion of the printed or green ceramic structures [36]. Monomers are essentially necessary to be thermally volatile in order to drive their easy removal during the post-thermal treatment (debinding) of the printed structures at temperature of about 500-550 ℃ [36,58,59]. It suggests that analysis of thermogravimetric property of the monomer is essential before being employed as binder.…”

Section: Monomermentioning

confidence: 99%

“…It suggests that analysis of thermogravimetric property of the monomer is essential before being employed as binder. The analysis may aid sintering (heating at much higher temperature of > 1000 ℃) of the final structure too, since complete removal of the binders will give rise to defect-free and highly dense structures [58,59]. Similarly, it is important that monomer has high solubility to make it serves as reactive diluents for ceramic particles [46,60].…”

Section: Monomermentioning

confidence: 99%

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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: Monomermentioning

confidence: 99%

Section: Monomermentioning

confidence: 99%

Photopolymerization-based additive manufacturing of ceramics: A systematic review

et al. 2021

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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%

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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“…139 Multiple factors have been found to influence the generation of these gases and their ability to diffuse non-destructively from the body, such as the ceramic particle sizes in the slurry, 140,141 the print exposure parameters, 142 part design 141,143 , and the thermal debinding conditions. [144][145][146] For example, Zhou et al showed that thermal debinding of 3D alumina green bodies in air resulted in significantly more defects compared to when the procedure was conducted in vacuum. The atmosphere used changed the decomposition rate of the organic binder and consequently the rate of gas generation within the body.…”

Section: Ceramicsmentioning

confidence: 99%

Three‐dimensional chemical reactors: in situ materials synthesis to advance vat photopolymerization

Yee

Greer

2021

Polymer International

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Vat photopolymerization (VP) is one of the most remarkable additive manufacturing techniques today and has been used for a variety of applications, from materials research to product manufacturing. The main challenge with VP is the limited choice of compatible materials, which motivates significant interest in VP materials development. We provide a brief overview of the materials that are currently accessible via VP and highlight recent advances in the field. We also provide perspective on expanding the library of materials compatible with VP using in situ materials synthesis.

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Microstructure and properties of 3D-printed alumina ceramics with different heating rates in vacuum debinding

Cited by 27 publications

References 38 publications

Photopolymerization-based additive manufacturing of ceramics: A systematic review

Photopolymerization-based additive manufacturing of ceramics: A systematic review

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

Three‐dimensional chemical reactors: in situ materials synthesis to advance vat photopolymerization

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