Gas pore former in cellular monoliths

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding

Reexamination Certificate

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C264S051000, C264S628000, C501S080000, C501S084000

Reexamination Certificate

active

07914718

ABSTRACT:
Porous ceramic articles may be produced by using a gas as a pore former, where the gas is injected into a ceramic precursor batch material and mixed. Pressure is then applied to mixture such that the gas liquefies. The pressure is maintained during formation of a green body, maintaining the gas in a liquefied state. After formation of the green body, the pressure is removed whereby the gas returns to a gaseous state, creating pores in the green body. The green body may then be fired to produce a porous ceramic article.

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