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Processing of Porous Silicon Carbide Ceramics from Carbon‐Filled Polysiloxane by Extrusion and Carbothermal Reduction
Author(s) -
Kim YoungWook,
Eom JungHye,
Wang Chunmin,
Park Chul B.
Publication year - 2008
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.1551-2916.2008.02280.x
Subject(s) - carbothermic reaction , silicon carbide , materials science , extrusion , ceramic , porosity , carbon fibers , sialon , carbide , reduction (mathematics) , composite material , chemical engineering , composite number , engineering , geometry , mathematics
Porous silicon carbide (SiC) ceramics with porosities ranging from 60% to 83% were fabricated from extruded blends of carbon‐filled polysiloxane using expandable microspheres as sacrificial templates. The fabrication process involved the following steps: (i) extrusion and in situ foaming of a mixture of polysiloxane, carbon black (used as a carbon source), Al 2 O 3 –Y 2 O 3 (used as a sintering additive), expandable microspheres (used as sacrificial templates), and SiC (an optional inert filler); (ii) cross linking the polysiloxane in the extruded blends; (iii) transforming the polysiloxane by pyrolysis into silicon oxycarbide; and (iv) fabricating porous SiC ceramics by carbothermal reduction and subsequent sintering.