Complex ceramic and metallic shaped by low pressure forming and

Details Complex ceramic and metallic shaped by low pressure forming and Complex ceramic and metallic shaped by low pressure forming and

1991-03-07

1991-09-10

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

264 56, 264 63, 2643282, 419 34, 419 36, 419 37, 419 39, 419 66, C04B 4192

Patent

active

050471821

ABSTRACT:
A process for forming articles from inorganic sinterable particulates includes providing a well-dispersed, low pressure injectable slurry, freeze-forming the slurry into a desired geometry, and drying the piece so formed by a predominantly sublimative process, to produce a green article that can be conventionally sintered. The vehicle has a volume change on freezing of not more than .+-.10% by volume; to further control the volume change on freezing, an emulsion derived from different vehicles can be tailored. The slurries preferably have a solids content of at least about 35 v/o, a viscosity of preferably not more than about 1000 cP at 100 s.sup.-1, and are preferably injectable at not more than about 1000 psi, usually at less than 100 psi.

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