Cordierite ceramic filter
AssigneeNGK Insulators, Ltd.
InventorsYoshiyuki Kasai, Kazuhiko Kumazawa, Wataru Kotani
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Abstract
A cordierite ceramic filter is formed by mixing cordierite powders having a porosity of more than 30% as aggregate with raw materials for cordierite generation, poring agents, forming agents and solvents to obtain a ceramic batch, extruding the ceramic batch into a honeycomb shape to obtain a formed body, and firing the formed body. The cordierite ceramic filter has a mean pore size in a range of aggregate mean size.times.0.15.+-.5 .mu.m, has a porosity of more than 30% and has a compressive strength more than 100 kgf/cm.sup.2 in a direction parallel to a flow passage. The cordierite ceramic filter has an excellent filter regeneration function, has a high mechanical strength and is light and compact.
Claims4
A ceramic honeycomb filter for separating a solid phase from a fluid, comprising:
- cordierire aggregates bonded to one another in the form of a honeycomb structure having an inlet side, an outlet side, and a plurality of longitudinal, intersecting partition walls extending from said inlet side to said outlet side and defining a plurality of flow passages;
- and
- sealing means for closing alternate ends of said flow passages, such that flow passages open on said inlet side are closed on said outlet side and flow passages open on said outlet side are closed on said inlet side;
- wherein said filter has (i) a mean pore size ranging from {0.15 (mean aggregate size)-5 .mu.m} to {0.15 (mean aggregate size)+5 .mu.m}, (ii) a porosity of at least 30%, and (iii) a compressive strength of at least 100 kgf/cm.sup.2 in a direction parallel to said flow passages.
Dependencies are inferred from the claim text.