Highly porous ceramics fabricated from preceramic polymer and expandable microspheres, and method for fabricating the same
First Claim
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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Accused Products
Abstract
Disclosed herein are a highly porous ceramic having a high porosity of not less than 60% and a pore density of not less than 108 pores/cm3 fabricated from expandable microspheres and a preceramic polymer, and a method for fabricating highly porous ceramic. The method for fabricating highly porous ceramic from expandable microspheres and a preceramic polymer comprises the steps of: homogeneously mixing a preceramic polymer powder and expandable hollow microspheres, if necessary, a ceramic powder, and molding the mixture to form a molded body; heating the molded body to expand it; curing the expanded molded body; and pyrolyzing the cured molded body.
Since the highly porous ceramic has a higher porosity and pore density than conventional porous ceramics, it can be suitably used for various high temperature structure materials, kiln furniture, bulletproof materials, shock-absorbing materials, insulating materials, refractory materials, lightweight structure materials, etc.
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Citations
7 Claims
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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:
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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. - View Dependent Claims (2, 4, 5)
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3. 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:
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homogeneously mixing a preceramic polymer powder in an amount of 20% by weight or more, based on the total weight of the starting materials and expandable hollow microspheres in an amount of 20% or more, 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. - View Dependent Claims (6, 7)
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Specification