POROUS MATERIAL FOR CERAMIC BUILDING MATERIAL, CERAMIC BUILDING MATERIAL, AND METHODS FOR PRODUCING THEM

摘要

PROBLEM TO BE SOLVED: To provide a porous material for ceramic building materials used for producing a ceramic building material having a large surface unevenness and a sharp pattern by a sheet-forming method, a ceramic building material using the same, and methods for producing them.

SOLUTION: The ceramic building material is produced from the porous material by a method comprising a first compression step of compressing the porous material by a first pressure and a second compression step of compressing the porous material by a second pressure which is higher than the first pressure. The porous material for ceramic building materials comprises at least two types of porous materials having different volume reduction ratios by the first pressure and the second pressure. The volume reduction ratio is the ratio of the volume of the part reduced by applying a predetermined pressure to the volume at the original pressure.

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