초록 ▼

Processes for making rigid ceramic bodies with one or more channels therein includes forming an outer tube of extrudable ceramic mix about an inner core of extrudable organic mix within the chamber of a piston type extrusion barrel composite, simultaneously extruding the outer tube and inner core th

Processes for making rigid ceramic bodies with one or more channels therein includes forming an outer tube of extrudable ceramic mix about an inner core of extrudable organic mix within the chamber of a piston type extrusion barrel composite, simultaneously extruding the outer tube and inner core through a tapered extrusion die having an extrusion outlet of smaller cross sectional size and area than the inner chamber of the extrusion barrel, cutting the extruded single core composite strand into shorter composite strands of equal length, filling the extrusion barrel with a plurality of the single core composite strands, simultaneously extruding the plurality of composite strands through the extrusion die and thereby forming a multiple core composite strand, cutting the multiple core composite strand into unfired green composite ceramic bodies and firing or alternatively prior to the cutting and firing steps again cutting the multiple core composite strand into equal lengths, refilling of the barrel therewith and extruding of a plurality of the multiple core composite strands through the extrusion die one or more times necessary to produce a ceramic body with the desired number of channels and then firing to simultaneously burn out the organic cores and cure the ceramic body.

대표청구항 ▼

A method of making a ceramic body with open channels extending therethrough comprising the steps of: preparing a batch of an extrudable ceramic mix and a batch of an extrudable organic mix; forming the ceramic and organic mixes into a plurality of single core composite strands of relatively small cr

A method of making a ceramic body with open channels extending therethrough comprising the steps of: preparing a batch of an extrudable ceramic mix and a batch of an extrudable organic mix; forming the ceramic and organic mixes into a plurality of single core composite strands of relatively small cross sectional area and of substantially the same length so each composite strand comprises an inner core of the organic mix surrounded by an outer layer of the ceramic mix; closely aligning and packing together a number of the single core composite strands into an inner chamber of an extrusion barrel of a conventional extruder sufficient to substantially fill the inner chamber of relatively larger cross sectional area and size than each of the single core composite strands; simultaneously extruding and forming the plurality of single core composite strands packed in the inner chamber into a multiple core composite strand of smaller cross sectional size and area than the inner chamber and having a plurality of spaced cores of the organic mix surrounded by and spaced from one another by the ceramic mix by forcing the single core composite strands through an extrusion die having an inner inclined surface extending and tapering inwardly from a large inlet end portion to an outlet end portion of the extrusion die and an extrusion aperture of predetermined cross sectional shape and of smaller cross sectional size and area than the inner chamber of the extrusion barrel; cutting the multiple core composite strand into one or more unfired green multiple core composite bodies of desired length; and firing the unfired green multiple core composite bodies at sufficient temperature and period of time to burn out the plurality of organic cores and bond the ceramic mix into a rigid ceramic body with a plurality of spaced open channels extending therethrough.