Method of extruding ceramic tube
AssigneeCorning Glass Works
InventorsPronob Bardhan, Carlo M. Golino, Larry D. Gorges, Sandra L. Morse
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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.
Claims20
A method of extruding ceramic bodies having at least one longitudinally-extending passage therethrough and including at least one wall, the thickness of which sufficiently small that it would tend to deform under its own weight, said method comprising
- combining a granular ceramic, a binder, a matrix precursor and an oxidizing agent that is soluble in said matrix precursor in amounts sufficient to provide a substantially water-free extrudable batch,
- homogenizing said batch, and
- extruding said batch as a deformable extrudate into an atmosphere containing SO.sub.2, said SO.sub.2 flowing into said at least one passage, permeating said extrudate and reacting with said oxidizing agent to form SO.sub.3 in situ, said SO.sub.3 catalyzing polymerization of said matrix precursor to a rigid solid, said atmosphere containing an amount of SO.sub.2 that is sufficient to substantially prevent deformation of said extrudates.
A method of extruding ceramic bodies having at least one longitudinally-extending passage therethrough and including at least one wall, the thickness of which is less than 0.5 mm, said method comprising
- combining a granular ceramic, a binder, furfuryl alcohol in said furfuryl alcohol in amounts sufficient to provide a substantially water-free extrudable batch,
- homogenizing said batch,
- providing an elongated chamber,
- flowing an SO.sub.2 -containing atmosphere into said chamber,
- venting the atmosphere from said chamber, and
- extruding said batch as a deformable extrudate into one end of said chamber, said SO.sub.2 flowing into said at least one passage, permeating said extrudate and reacting with said oxidizing agent to form SO.sub.3 in situ, said SO.sub.3 catalyzing polymerization of said furfuryl alcohol to a rigid solid.
Dependencies are inferred from the claim text.