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Porous 2H‐Silicon Carbide Ceramics Fabricated by Carbothermal Reaction between Silicon Nitride and Carbon
Author(s) -
Yang JianFeng,
Zhang GuoJun,
Kondo Naoki,
She JiHong,
Jin ZhiHao,
Ohji Tatsuki,
Kanzaki Shuzo
Publication year - 2003
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.1151-2916.2003.tb03396.x
Subject(s) - materials science , sintering , microstructure , ceramic , silicon carbide , porosity , silicon nitride , carbon fibers , flexural strength , carbothermic reaction , composite material , nitride , silicon , carbide , metallurgy , layer (electronics) , composite number
Porous SiC ceramics were synthesized by sintering pressed and pressed/CIPed powder compacts of α‐Si 3 N 4 , carbon (Si 3 N 4 :C = 1:3 mol as ratio), and sintering aids, at 1600°C for few hours to achieve a reaction, and subsequently sintering at a temperature range of 1750°–1900°C, in an argon atmosphere. High porosities from 45%–65% were achieved by low shrinkage with large weight loss. Formation of pure 2H‐SiC phase via a reaction between Si 3 N 4 and carbon can be demonstrated by X‐ray diffractometry. The resultant porous SiC samples were characterized by SiC grain microstructures, pore‐size distribution, and flexural strength. This method has the advantage of fabricating high‐porous SiC ceramics with fine microstructure and good properties at a relatively low temperature.