Method for producing honeycomb structure

Details Method for producing honeycomb structure Method for producing honeycomb structure

2011-03-01

2011-03-01

Lopez, Carlos (Department: 1747)

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Producing article having plural hollow channels

C264S630000, C264S631000

Reexamination Certificate

active

07897099

ABSTRACT:
There is provided a honeycomb structure and a method for producing the honeycomb structure, capable of reducing variance in pore diameter depending on part and capable of increasing the mean pore diameter as a whole. There is provided a method for producing a cordierite honeycomb structure1including the step of firing a honeycomb formed body. In the firing step, a temperature rise rate from 1200° C. to 1250° C. is controlled to 40° C./hr or more, a temperature rise rate from 1250° C. to 1300° C. is controlled to 2 to 40° C./hr, and a temperature rise rate from 1300° C. to 1400° C. is controlled to 40° C./hr or more. There is further provided a honeycomb structure having a porosity of 50 to 70%, a mean pore diameter of 15 to 30 μm, a difference in a mean pore diameter of 5 μm or less between in the central portion and in the outer peripheral portion, a thermal expansion coefficient of 1.0×10−6/° C. or less in each of the central portion and the outer peripheral portion, and an A-axis compression strength of 1.5 MPa or more in each of the central portion and the outer peripheral portion.

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