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AssigneeNational Institute of Advanced Industrial Science and Technology
InventorsManabu Fukushima, Masayuki Nakata, Yuichi Yoshizawa
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The present invention is a method for producing a ceramic porous body with high porosity and continuous macropores, which comprises mixing a ceramic powder with an aqueous solution of a gelable water-soluble polymer to form a slurry, gelling for a while to fix the tissue structure, freezing it to produce ice crystals in the gel tissue and creating structures that become continuous pores, thawing the ice by controlled atmospheric substitution-type drying method with the resulting water being replaced without damaging the gel, and then sintering it to produce a ceramic porous body having various porosities, pore diameters and pore shapes, while conventionally cracks and contraction were likely to occur during drying when the solids concentration of the slurry is less than 20 vol %, with the method of the present invention it is possible to control these problems even at a solids concentration of 10 vol % or less, manufacture and provide a ceramic porous body with a porosity of 72% to 99% and a compression strength of 0.4 MPa or more.
A method for producing a ceramic porous body which comprises forming a slurry of 0.01 μm to 5 μm ceramic raw material powder dispersed in an aqueous solution of a gelable water-soluble polymer, gelling and then freezing the slurry to give a frozen body having a tissue structure of ice crystals formed from water released from the gelable water-soluble polymer, and then maintaining this structure intact through thawing, drying and sintering processes to give a ceramic porous body having continuous macropores of 10 μm to 300 μm in diameter and a porosity of 72% to 99%,
A ceramic porous body having a compressive strength of at least 0.4 Mpa and a high porosity of 72% to 99%, wherein the pores of the ceramic porous body are continuous pores with a pore diameter of 10 μm to 300 μm and a pore shape with a mean aspect ratio of at least 1.5, and said ceramic porous body has no closed pores and no pores with a branching structure (dendrite structure).
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