Microstructure of Fe2O3 scaffolds created by freeze-casting and sintering

Ranier Sepúlveda*, Amelia A. Plunk, David C. Dunand

*Corresponding author for this work

Research output: Contribution to journalComment/debatepeer-review

37 Scopus citations

Abstract

Fe2O3 scaffolds with an open porosity of ∼81% were fabricated by freeze casting of a suspension of hematite nano-particles in liquid camphene, sublimation of the camphene, and sintering of the interconnected walls of hematite particles concentrated in the interdendritic spaces. At high solidification velocity, the camphene dendrites created, after sublimation, equiaxed, interconnected macropores, whose size increases with decreasing velocity and which are surrounded by interconnected hematite walls. At the lowest solidification velocity, camphene dendrites grow radially into the sample along the temperature gradient, creating, after sublimation, aligned elongated macropores, 50-150 μm in diameter and 3-4 mm in length, surrounded by aligned hematite walls with low levels of microporosity after sintering. Hydrogen reduction of such a sample resulted in a metallic iron scaffold with the same elongated macropore and densified iron walls.

Original languageEnglish (US)
Pages (from-to)56-59
Number of pages4
JournalMaterials Letters
Volume142
DOIs
StatePublished - Mar 1 2015

Keywords

  • Camphene
  • FeO
  • Freeze-casting
  • Hydrogen
  • Porous materials
  • Redox process

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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