Freezing dilute ceramic/camphene slurry for ultra-high porosity ceramics with completely interconnected pore networks

Young-Hag Koh, Ju Ha Song, Eun Jung Lee, Hyoun Ee Kim

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

Highly porous alumina ceramics with completely interconnected pore channels were fabricated by freezing dilute alumina/camphene slurries with solid loadings ranging from 5 to 20 vol%. This method fundamentally made full use of the three-dimensional camphene dendritic network for producing interconnected pore channels and the concentrated alumina powder network for achieving dense alumina walls. Firstly, alumina/camphene slurries were prepared at 60°C using ball milling and then cast into molds at 20°C. After subliming the frozen camphene, the samples were sintered at 1400°C for 5 h. This method enabled us to freeze very dilute ceramic slurries with a low solid loading of ≤20 vol% without the collapse of the sample after sintering. As the initial solid loading decreased from 20 to 5 vol%, the porosity linearly increased from 66% to 90% with an increase in the pore size, while completely interconnected pore networks were obtained in all cases. In addition, the free surfaces of the alumina walls showed full densification after sintering even at a low temperature of 1400°C, while some pores were present in the inner regions of the alumina walls.

Original languageEnglish
Pages (from-to)3089-3093
Number of pages5
JournalJournal of the American Ceramic Society
Volume89
Issue number10
DOIs
Publication statusPublished - 2006 Oct 1
Externally publishedYes

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Camphene
Aluminum Oxide
Freezing
ceramics
aluminum oxide
slurry
freezing
Alumina
Porosity
porosity
Slurries
Sintering
Ball milling
Molds
camphene
Densification
Powders
Pore size

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Freezing dilute ceramic/camphene slurry for ultra-high porosity ceramics with completely interconnected pore networks. / Koh, Young-Hag; Song, Ju Ha; Lee, Eun Jung; Kim, Hyoun Ee.

In: Journal of the American Ceramic Society, Vol. 89, No. 10, 01.10.2006, p. 3089-3093.

Research output: Contribution to journalArticle

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