Plastic and nonmetallic article shaping or treating: processes – Utilizing special inert gaseous atmosphere or flushing mold...
Patent
1995-07-12
1998-08-25
Edwards, Laura
Plastic and nonmetallic article shaping or treating: processes
Utilizing special inert gaseous atmosphere or flushing mold...
264572, B29C 4503
Patent
active
057980667
ABSTRACT:
A method of forming a hollow ceramic article includes the steps of providing a mold having a wall defining a cavity and injecting into the cavity through an inlet through the cavity wall a quantity of a slurry sufficient to fill the cavity. The slurry is formed by a molten thermoplastic binder and ceramic particles suspended in the binder. The portion of the slurry in contact with the cavity wall is cooled to solidify the same, while leaving still molten the portion of the slurry not in contact with the cavity wall. Gas is injected into the cavity through an inlet through the cavity wall and into the still molten slurry portion to force the same out of the cavity through an outlet through the cavity wall. This leaves therein only the gas and a hollow green piece formed from the solidified slurry portion. The hollow green piece is separated from the mold, and the separated hollow green piece is fixed to remove substantially all of the binder therefrom and sinter together substantially only the ceramic particles therefrom.
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Certech Incorporated
Colaianni Michael P.
Edwards Laura
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