Honeycomb structure and method for manufacturing same
AssigneeNGK Insulators, Ltd.
InventorsKoji MOTOKI, Hiroaki HAYASHI
Life of this patent
Estimating the term…
Abstract
A honeycomb structure includes a plurality of cell channels passing through an inside of the honeycomb structure and partitioned by porous partition walls, wherein the honeycomb structure includes 80.0 to 94.0% by mass of cordierite as a main crystalline phase and ceria contained in a secondary crystalline phase; the porous partition walls have a porosity of 60% or more as measured by a mercury porosimetry; and for the porous partition walls, a cumulative 10% pore diameter (D10), a cumulative 50% pore diameter (D50) and a cumulative 90% pore diameter (D90) from a small pore side satisfy a relationship (D90−D10)/D50≤1.2, in a volume-based cumulative pore diameter distribution as measured by the mercury porosimetry.
Claims9
A honeycomb structure, comprising a plurality of cell channels passing through an inside of the honeycomb structure and partitioned by porous partition walls,
- wherein the honeycomb structure comprises 80.0 to 94.0% by mass of cordierite as a main crystalline phase and ceria contained in a secondary crystalline phase;
- the porous partition walls have a porosity of 60% or more as measured by a mercury porosimetry;
- and
- for the porous partition walls, a cumulative 10% pore diameter (D10), a cumulative 50% pore diameter (D50) and a cumulative 90% pore diameter (D90) from a small pore side satisfy a relationship (D90−D10)/D50≤1.2, in a volume-based cumulative pore diameter distribution as measured by the mercury porosimetry.
A method for manufacturing a honeycomb structure, comprising:
- a step of obtaining a honeycomb formed body comprising a plurality of cell channels passing through an inside of the honeycomb formed body and partitioned by porous partition walls by kneading a raw material composition comprising a cordierite-forming raw material, ceria, a dispersion medium, a pore-forming material, and a binder to form a green body, and then extrusion molding the green body;
- and
- a step of firing the honeycomb formed body;
- wherein in the step of firing, assuming a maximum temperature during the firing is X (° C.), a holding time at the maximum temperature is Y (hr), and a content of ceria with respect to 100 parts by mass of the cordierite-forming raw material in the honeycomb formed body is Z (parts by mass), the step of firing is performed such that 160≤(X−1345)×Y×(Z+0.5)2≤7680 is satisfied.
Dependencies are inferred from the claim text.