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Highly Aligned Porous Silicon Carbide Ceramics by Freezing Polycarbosilane/Camphene Solution
Author(s) -
Yoon ByungHo,
Lee EunJung,
Kim HyounEe,
Koh YoungHag
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01703.x
Subject(s) - camphene , materials science , porosity , silicon carbide , ceramic , pyrolysis , chemical engineering , porous medium , nucleation , phase (matter) , composite material , chemistry , chromatography , organic chemistry , essential oil , engineering
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.