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Fabrication of Open‐Cell, Microcellular Silicon Carbide Ceramics by Carbothermal Reduction
Author(s) -
Kim YoungWook,
Kim ShinHan,
Song InHyuck,
Kim HaiDoo,
Park Chul B.
Publication year - 2005
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.1551-2916.2005.00509.x
Subject(s) - carbothermic reaction , materials science , silicon carbide , sintering , ceramic , pyrolysis , fabrication , porosity , carbon fibers , composite material , polymer , chemical engineering , phenol , carbide , composite number , chemistry , organic chemistry , medicine , alternative medicine , pathology , engineering
A novel processing route for developing open‐cell, microcellular SiC ceramics has been developed. The strategy adopted for making microcellular SiC ceramics involved the following: (i) fabricating a formed body from a mixture of polysiloxane, phenol resin (used as a carbon source), polymer microbeads (used as sacrificial templates), and Al 2 O 3 –Y 2 O 3 (an optional sintering additive); (ii) cross‐linking the polysiloxane in the formed body; (iii) transforming the polysiloxane and phenol resin by pyrolysis into silicon oxycarbide and C, respectively; and (iv) synthesizing SiC by carbothermal reduction. By controlling the microbead and additive contents, it was possible to adjust the porosity so that it ranged from 60% to 95%.