Dual-Scale Porosity Alumina Structures Using Ceramic/Camphene Suspensions Containing Polymer Microspheres

Hyun Lee, Jong Won Jeon, Young Hag Koh, Hyoun Ee Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study demonstrates the utility of thermo-regulated phase separable alumina/camphene suspensions containing poly(methyl methacrylate) (PMMA) microspheres as porogens for the pro-duction of multi-scale porosity structures. The homogeneous suspension prepared at 60 C could undergo phase separation during freezing at room temperature. This process resulted in the 3D net-works of camphene crystals and alumina walls containing PMMA microspheres. As a consequence, relatively large dendritic pores with several tens of microns size could be created as the replica of frozen camphene crystals. In addition, after the removal of PMMA microspheres via heat-treatment, micron-sized small spherical pores could be generated in alumina walls. As the PMMA content with respect to the alumina content increased from 0 vol% to 40 vol%, while the camphene content in the suspensions was kept constant (70 vol%), the overall porosity increased from 45.7 ± 0.5 vol% to 71.4 ± 0.5 vol%. This increase in porosity is attributed to an increase in the fraction of spherical pores in the alumina walls. Thus, compressive strength decreased from 153 ± 18.3 MPa to 33 ± 7.2 MPa. In addition, multi-scale porosity alumina objects with a honeycomb structure comprising periodic hexagonal macrochannels surrounded by dual-scale porosity walls were constructed using a 3D plotting technique.

Original languageEnglish
Article number3875
JournalMaterials
Volume15
Issue number11
DOIs
Publication statusPublished - 2022 Jun 1

Bibliographical note

Funding Information:
Funding: This research was funded by supported by a Korea University Grant by Korea Unversity.

Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • freeze casting
  • multi-scale porous ceramic
  • porogen
  • sacrificial templates

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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