Patent ID: 8894915

Claim:
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 m 2 /g or more, the alumina source comprising 0.45 to 15.8% by mass of Boehmite (Al 2 O 3 .H 2 O), 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 (Al 2 O 3 .H 2 O) has a BET specific surface area of 80 m 2 /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.