Effect of aluminum hydroxide content on porosity and strength of porous mullite-bonded silicon carbide ceramics

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  • KUMAR B. V. Manoj
    Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul
  • EOM Jung-Hye
    Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul
  • KIM Young-Wook
    Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul
  • SONG In-Hyuck
    Engineering Ceramics Group, Korea Institute of Materials Science
  • KIM Hai-Doo
    Engineering Ceramics Group, Korea Institute of Materials Science

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Porous mullite-bonded silicon carbide (SiC) ceramics were prepared from SiC and aluminum hydroxide [Al(OH)3] powders. The Al(OH)3 content was varied from 14.5 to 47.3 wt %, and porous SiC ceramics were fabricated via reaction sintering at 1450–1550°C for 2 h. The microstructure showed large SiC grains embedded in a matrix of small and loosely packed mullite/alumina particles. It was demonstrated that the porosity decreased and flexural strength increased with increase in Al(OH)3 content. The porosity varied from 46 to 54%, and flexural strength varied from 3 to 14 MPa with the variation in Al(OH)3 content and sintering temperature. Typically, porous mullite-bonded SiC ceramics of 14 MPa strength and 47% porosity were obtained when SiC and 47.3 wt % Al(OH)3 powders were sintered at 1500°C.

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