Method for manufacturing filter having ceramic porous film as separating film
AssigneeNGK Insulators, Ltd.
InventorsTomonori Takahashi, Manabu Isomura, Masahiro Murasato
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Abstract
A method for manufacturing a filter utilizing a ceramic porous membrane is provided, comprising the step of depositing a film deposition slurry containing ceramic framework particles on the surface of a porous substrate. The slurry contains an organic polymer for expanding gaps among the ceramic framework particles, and the micro-pore size of the porous membrane is controlled by adjusting the weight ratio between the framework particles and the organic polymer in the slurry, thereby enabling a porous membrane having a desired micro-pore size to be formed irrespective of the particle size of the framework particles.
Claims5
A method of manufacturing a filter comprising a porous substrate having a porous ceramic separation membrane formed on a surface thereof, comprising the steps of:
- preparing a slurry comprising a plurality of ceramic powder framework particles and a micro-pore size control agent, wherein a predetermined amount by weight of said framework particles is mixed with a predetermined amount by weight of said micro-pore size control agent to control the size of micro-pores in said membrane to be within a predetermined range;
- and
- depositing said slurry on a surface of said porous substrate,
- wherein said micro-pore size control agent comprises at least one of agar and welan gum.
Dependencies are inferred from the claim text.