Fabrication of mullite-bonded porous silicon carbide ceramics by in situ reaction bonding

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• 作者：Shuqiang Ding ; Sumin Zhu ; Yu-Ping Zeng ; Dongliang Jiang
• 关键词：Porous ceramics ; Mullite ; SiC
• 刊名：Journal of the European Ceramic Society
• 出版年：2007
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：2007
• 卷：27
• 期：4
• 页码：2095-2102
• 文件大小：1163 K

摘要

An in situ reaction bonding technique was developed to fabricate mullite-bonded porous silicon carbide (SiC) ceramics in air from SiC and α-Al₂O₃, using graphite as the pore-former. Graphite is burned out to produce pores and the surface of SiC is oxidized to SiO₂ at high temperature. With further increasing the temperature, the amorphous SiO₂ converts into cristobalite and reacts with α-Al₂O₃ to form mullite (3Al₂O₃·2SiO₂). SiC particles are bonded by the mullite and oxidation-derived SiO₂ to obtain porous SiC ceramics. The reaction bonding behavior, open porosity, pore size distribution and mechanical strength of porous SiC ceramics were investigated as a function of the sintering temperature, forming pressure and graphite content. In addition, the phase composition and microstructure were also studied.