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Highly porous ceramics fabricated from preceramic polymer and expandable microspheres, and method for fabricating the same

  • US 7,033,527 B2
  • Filed: 09/23/2003
  • Issued: 04/25/2006
  • Est. Priority Date: 07/16/2003
  • Status: Active Grant
First Claim
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1. A method for fabricating a highly porous ceramic which has a high porosity of not less than 60% and a pore density of not less than 109 pores/cm3 from expandable microspheres and a preceramic polymer, comprising the steps of:

  • homogeneously mixing a preceramic polymer powder in an amount of 20% by weight or more, based on the total weight of the starting materials, expandable hollow microspheres in an amount of 20% by weight or more, based on the total weight of the starting materials and a ceramic powder in an amount of 50% by weight or less, based on the total weight of the starting materials, and molding the mixture to form a molded body;

    heating the molded body to expand the molded body and the expandable hollow microspheres at a temperature of 110˜

    200°

    C., the temperature range between the softening point and melting point of the preceramic polymer;

    curing the expanded molded body; and

    pyrolyzing the cured molded body.

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