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US 8,894,915 B2Granted
Honeycomb structure and manufacturing method thereof
AssigneeNGK Insulators, Ltd.
InventorYoshiro Ono
Life of this patent
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Abstract
A honeycomb structure is made of cordierite and has a plurality of cells separated from each other by porous partition walls and functioning as fluid passages. The honeycomb structure has a thermal expansion coefficient of 0.25×10−6/° C. or less, an average pore diameter is 3 to 8 μm, and a porosity of 25% or more. The honeycomb structure is made of cordierite excellent in thermal shock resistance even with large pore diameters and high porosity.
Claims6
A method for manufacturing a honeycomb structure, comprising:
- forming clay comprising cordierite-forming raw material in a honeycomb shape to obtain a formed body, the cordierite-forming raw material comprising:
- 13 to 28% by mass of an alumina source having a BET specific surface area of 10 m2/g or more, the alumina source comprising 0.45 to 15.8% by mass of Boehmite (Al2O3.H2O), with respect to the cordierite-forming raw material, having an average particle size of 1 μm or less and the alumina source further comprising 4-28% by mass of aluminum hydroxide;
- and
- drying and firing the formed body to obtain a honeycomb structure having a plurality of cells separated from each other by porous partition walls and functioning as fluid passages;
- wherein the boehmite (Al2O3.H2O) has a BET specific surface area of 80 m2/g or more, the cordierite-forming raw material further comprises 8% by mass or less of silica, the silica has an average particle diameter between 4 μm and 50 μm, and the honeycomb structure has:
- a thermal expansion coefficient of 0.25×10−6/° C. or less,
- an average pore diameter is 3 to 8 μm, and
- a porosity of 25% or more.
5 more elements
Dependencies are inferred from the claim text.