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UV curing-assisted 3D plotting of ceramic feedstock containing thermo-regulated phase-separable, photocurable vehicle for dual-scale porosity structure

Authors
Choi, Woo-LimJeon, Jong-WonChoe, Gyu-BinKim, Gyu-NamKoh, Young-HagKim, Hyoun-Ee
Issue Date
1-9월-2022
Publisher
ELSEVIER SCI LTD
Keywords
UV curing-assisted 3D plotting; Dual-scale porosity; Camphene; Phase separation
Citation
CERAMICS INTERNATIONAL, v.48, no.17, pp.24383 - 24392
Indexed
SCIE
SCOPUS
Journal Title
CERAMICS INTERNATIONAL
Volume
48
Number
17
Start Page
24383
End Page
24392
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/143741
DOI
10.1016/j.ceramint.2022.05.044
ISSN
0272-8842
Abstract
We propose a novel approach for manufacturing dual-scale porosity alumina structures by UV curing-assisted 3D plotting of a specially formulated alumina feedstock using a thermo-regulated phase separable, photocurable camphene/triethylene glycol dimethacrylate (TEGDMA) vehicle. In particular, 3D plotting process was conducted at - 5 degrees C, and thus an alumina suspension prepared using liquid camphene/TEGDMA at room temperature could undergo phase separation, resulting in camphene crystals surrounded by walls comprised of liquid photopolymer enclosing alumina particles. To enhance the shape retention ability of extruded filaments, polystyrene (PS) polymer was used as the tackifier. The phase-separated feedrod could be extruded favorably through a nozzle and rapidly photopolymerized by UV light during the 3D plotting process. Three-dimensionally interconnected macropores were tightly constructed, which were separated by microporous alumina filaments, where micropores were created by the removal of camphene crystals via freeze-dying. The macroporosity of porous alumina ceramics was controlled by adjusting the distance between deposited filaments, while their microporosity was kept constant, leading to tightly tailored overall porosity and mechanical properties.
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