Ceramic porous body and method for producing the same, and dust collecting filter
AssigneeNGK Insulators, Ltd.
InventorsHiroaki NOGUCHI, Shuichi Ichikawa, Akifumi Kawakami, Mitsuhiro Ito
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Abstract
A ceramic porous body comprising: skeleton portions including an aggregate and at least one binding material; and pore portions formed between the skeleton portions, the pore portions being capable of allowing a fluid to flow therethrough. In the ceramic porous body, the pore portions have a pore volume ratio of pores having a pore diameter of from 1 to 10 μm, of 45% or more, and a ratio of a contact area between the aggregate and the binding material to a surface area of the binding material of from 20 to 60%.
Claims10
A ceramic porous body comprising:
- skeleton portions including an aggregate and at least one binding material;
- and pore portions formed between the skeleton portions, the pore portions being capable of allowing a fluid to flow therethrough,
- wherein the pore portions have a pore volume ratio of pores having a pore diameter of from 1 to 10 μm, of 45% or more, and a ratio of a contact area between the aggregate and the binding material to a surface area of the binding material of from 20 to 60%.
A method for producing a ceramic porous body, comprising the steps of:
- forming a green body to provide a formed body, the green body comprising:
- an aggregate;
- at least one binding material;
- at least one sintering aid containing two or more components;
- and at least one binder, wherein a mass ratio of the aggregate to the binding material is from 65:35 to 85:15;
- and
- firing the formed body at a temperature higher than or equal to a melting point of the binding material and lower than or equal to a melting point of the binding material+50° C. for 1 to 4 hours;
- wherein the sintering aid forms oxides during the firing, a proportion of a binary oxide having the lowest melting point in the oxides is from 25 to 50% by mass, and the binary oxide has a melting point lower than or equal to the firing temperature.
Dependencies are inferred from the claim text.