Method of extruding ceramic tube

Plastic and nonmetallic article shaping or treating: processes – Reactive gas or vapor treatment of work

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Details

264 63, B28B 2152, C04B 4002

Patent

active

047253916

ABSTRACT:
A method is disclosed for extruding thin-walled ceramic bodies. The method involves mixing into a homogenized batch a granular ceramic, a binder, a soluble oxidizing agent and a matrix precursor in amounts sufficient to provide a substantially water-free extrudable mixture. The batch is extruded into an atmosphere containing SO.sub.2 which permeates the extrudate and reacts with the oxidizing agent to form SO.sub.3 in situ. The SO.sub.3 catalyzes polymerization of the furfuryl alcohol to a rigid solid which prevents deformation of the extrudate.

REFERENCES:
patent: 2950503 (1960-08-01), McRae
patent: 3789097 (1974-01-01), Beck
patent: 3879339 (1975-04-01), Richard
patent: 3899554 (1975-08-01), Kaiser

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