Tailored graded pore structure in zirconia toughened alumina ceramics using double-side cooling freeze casting

Annemarie Preiss, Bo Su*, S Collins, D Simpson

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

52 Citations (Scopus)

Abstract

Ceramics with graded and continuously aligned open pores were investigated using a double-side cooling freeze casting setup. The ceramic preforms with tailored lamellae spacing (wavelength), wall thickness and graded pore structure were used to infiltrate with a second phase for the fabrication of graded interpenetrating phase composites. The effects of solid content, temperature setting and gradient, cooling rate and the introduction of electrophoretic deposition (EPD) on the freezing velocity of the ceramic suspension were analysed. On the bottom of the ceramic specimen, a dense layer was formed and tailored with the use of EPD. The ceramic was characterised by a graded open pore structure with wavelengths up to 115 mu m and interconnected microstructure. The effect of solid content on the degree of supercooling and the effect of temperature gradient on the average freezing velocity were investigated. The addition of EPD before freeze casting affected significantly the microstructure, the wavelength decreased and the wavelength gradient became smaller compared to simple freeze casting. (C) 2012 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)1575-1583
Number of pages9
JournalJournal of the European Ceramic Society
Volume32
Issue number8
DOIs
Publication statusPublished - Jul 2012

Keywords

  • FABRICATION
  • POROUS CERAMICS
  • Freeze casting
  • COMPOSITES
  • Suspensions
  • Porosity
  • Al2O3
  • SUSPENSIONS
  • Microstructure
  • SLURRY

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