Filter made of porous ceramic sintered body
AssigneeNGK Insulators, Ltd.
InventorNaomi Noda
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Abstract
The invention is directed to a filter made of a porous ceramics sintered body has a honeycomb structure having a large number of through channels partitioned by partition walls and passing through along an axial direction. When a ratio of a pore volume having a diameter of 30 μm or more to a total pore volume, measured by a method of mercury penetration, of the filter is P1(%) and a thickness of said partition wall is T (μm), these satisfy the relationship defined by the following formula: P1×10≦T. In case of this filter, one may produce it relatively easily on a large scale without adjustment requiring the change of the properties of material for a filter, and the filter can flexibly cope with various uses.
Claims29
A filter of a porous ceramics sintered body having a honeycomb structure having a large number of through channels partitioned by partition walls and passing through along an axial direction, and the partition walls have a thickness and have a plurality of pores, wherein the thickness of the partition walls and the sizes of the pores are relatively varied in a corresponding relationship to each other, characterized in that when a ratio of a pore volume having a diameter of 30 μm or more to a total pore volume, measured by a method of mercury penetration, of the filter is P1 (%) and a thickness of said partition wall is T (μm), these satisfy relationship defined by the following formula:
- P1×15≦T.
A filter of a porous ceramics sintered body having a honeycomb structure having a large number of through channels partitioned by partition walls and passing through along an axial direction, and the partition walls have a thickness and have a plurality of pores, wherein the thickness of the partition walls and the sizes of the pores are relatively varied in a corresponding relationship to each other, characterized in that when an average pore diameter, and a ratio of a pore volume having a diameter of below 3 μm to a total pore volume, measured by a method of mercury penetration, of the filter are D (μm) and P3 (%), respectively, and a thickness of said partition wall is T (μm), these satisfy relationships defined by the following two formulas:
- (1/P3)×1500≧T (DX100)≧T
- and
- (1/P3)×400≧T.
A filter of a porous ceramics sintered body having a honeycomb structure having a lot of through channels partitioned by partition walls and passing through along an axial direction, and the partition walls have a thickness and have a plurality of pores, wherein the thickness of the partition walls and the sizes of the pores are relatively varied in a corresponding relationship to each other, characterized in that a ratio of a pore volume having a diameter of below 6 μm to a total pore volume, measured by a method of mercury penetration, of the filter is P4 (%) and a thickness of said partition wall is T (μm), these satisfy relationship defined by the following formula:
- (1/P4)×1300≧T.
A filter of a porous ceramics sintered body having a honeycomb structure having a lot of through channels partitioned by partition walls and passing through along an axial direction, characterized in that a ratio of a pore volume having a diameter of below 6 μm to a total pore volume, measured by a method of mercury penetration, of the filter is P4 (%) and a thickness of said partition wall is T (μm), these satisfy relationship defined by the following formula:
- (1/P4)×3000≧T,
- and when said ratio of a pore volume having a diameter of 30 μm or more to a total pore volume, measured by a method of mercury penetration, of the filter is P1 (%) and a thickness of said partition wall is T (μm), these satisfy relationship defined by the following formula:
- P1×15≦T.
A filter of a porous ceramics sintered body having a honeycomb structure having a lot of through channels partitioned by partition walls and passing through along an axial direction, characterized in that a ratio of a pore volume having a diameter of below 6 μm to a total pore volume, measured by a method of mercury penetration of the filter is P4 (%) and a thickness of said partition wall is T (μm), these satisfy relationship defined by the following formula:
- (1/P4)×3000≧T,
- and when said ratio of a pore volume having a diameter of 30 μm or more to a total pore volume, measured by a method of mercury penetration, of the filter is P1 (%) and a thickness of said partition wall is T (μm), these satisfy relationship defined by the following formula:
- P1×20≦T.
Dependencies are inferred from the claim text.