Effect of polystyrene addition on freeze casting of ceramic/camphene slurry for ultra-high porosity ceramics with aligned pore channels

Young-Hag Koh, Eun Jung Lee, Byung Ho Yoon, Ju Ha Song, Hyoun Ee Kim, Hae Won Kim

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

We investigated the effect of polystyrene (PS) addition on the freezing behavior of a very dilute alumina/camphene slurry with an initial solid loading of 5 vol% for the fabrication of ultra-high porosity ceramics with aligned pore channels. To accomplish this, slurries with various PS contents (10, 20, and 30 vol% in relation to the alumina powders) were prepared by ball milling at 60°C and then cast into molds at a constant temperature of 20°C. After removing the frozen camphene, the samples were heat treated to burn out the organic phases and sinter the alumina walls. The addition of the PS binder remarkably enhanced the green strength of the sample, making it possible to handle it without difficulty. All of the sintered samples showed ultra-high porosities of > 88% without the collapse of the porous structure, wherein the pore channels were completely interconnected. Three distinctive zones having different pore structures were observed, viz. the outer shell with elongated pores, the inner zone with long aligned pore channels, and the center with equiaxed pores. The content of the PS polymer significantly affected the pore morphologies in the three distinctive zones. In addition, it was found that the addition of the PS polymer was highly beneficial to the alignment of the pore channels.

Original languageEnglish
Pages (from-to)3646-3653
Number of pages8
JournalJournal of the American Ceramic Society
Volume89
Issue number12
DOIs
Publication statusPublished - 2006 Dec 1
Externally publishedYes

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Camphene
Polystyrenes
ceramics
slurry
Casting
Porosity
porosity
aluminum oxide
Aluminum Oxide
Alumina
polymer
Polymers
sinter
freezing
Slurries
Ball milling
Molds
Pore structure
Freezing
Powders

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Effect of polystyrene addition on freeze casting of ceramic/camphene slurry for ultra-high porosity ceramics with aligned pore channels. / Koh, Young-Hag; Lee, Eun Jung; Yoon, Byung Ho; Song, Ju Ha; Kim, Hyoun Ee; Kim, Hae Won.

In: Journal of the American Ceramic Society, Vol. 89, No. 12, 01.12.2006, p. 3646-3653.

Research output: Contribution to journalArticle

Koh, Young-Hag ; Lee, Eun Jung ; Yoon, Byung Ho ; Song, Ju Ha ; Kim, Hyoun Ee ; Kim, Hae Won. / Effect of polystyrene addition on freeze casting of ceramic/camphene slurry for ultra-high porosity ceramics with aligned pore channels. In: Journal of the American Ceramic Society. 2006 ; Vol. 89, No. 12. pp. 3646-3653.
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