Method of injection molding ceramic greenward composites without

Details Method of injection molding ceramic greenward composites without Method of injection molding ceramic greenward composites without

1990-06-07

1992-03-24

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 63, 264 86, 264313, 264317, 2643282, 264517, 419 36, 419 37, 419 40, 419 44, 419 65, B22F 302, C04B 3328

Patent

active

050986201

ABSTRACT:
A method and apparatus for injection molding of ceramic suspension is disclosed wherein an elastomeric bladder is disposed within a mold cavity of a mold. The elastomeric bladder, in a relaxed state, can be tubular or can be formed by bonding together sheets of material. A ceramic suspension is injected into the elastomeric bladder, whereby the elastomeric bladder is distended. Distention of the elastomeric bladder applied a significant force to the ceramic suspension for preventing jetting and formation of knit lines within the ceramic suspension. The ceramic suspension distends the elastomeric bladder until the mold cavity is filled. The ceramic suspension is then exposed to conditions sufficient to cause the injected ceramic suspension to form a molded ceramic greenware composite. The molded ceramic greenware composite can then be removed from the mold for drying and for debindering and densification to form a finished ceramic part.

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