Highly aligned porous silicon carbide ceramics by freezing polycarbosilane/camphene solution

Byung Ho Yoon, Eun Jung Lee, Hyoun Ee Kim, Young Hag Koh

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

We fabricated highly aligned porous silicon carbide (SiC) ceramics with well-defined pore structures by freezing a polycarbosilane (PCS)/camphene solution. In this method, the solution prepared at 60°C was cast into a mold at temperatures ranging from 20° to -196°C, which resulted in a bicontinuous structure, in which each phase (camphene or PCS) was interconnected in a regular pattern. After the removal of the frozen camphene network, the samples showed highly porous structures, in which long straight and short elongated pore channels were formed parallel and normal to the direction of freezing, respectively. Thereafter, porous SiC ceramics were produced by the pyrolysis of the porous PCS objects at 1400°C for 1 h in a flowing Ar atmosphere, while preserving their mother pore structures having aligned pore channels.

Original languageEnglish
Pages (from-to)1753-1759
Number of pages7
JournalJournal of the American Ceramic Society
Volume90
Issue number6
DOIs
Publication statusPublished - 2007 Jun

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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