Forming of complex high performance ceramic and metallic shapes

Details Forming of complex high performance ceramic and metallic shapes Forming of complex high performance ceramic and metallic shapes

1991-02-25

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 36, 419 37, 419 40, 419 66, B22F 100, C04B 3564

Patent

active

050471813

ABSTRACT:
Dense, flaw free, complex, 3-dimensional, metal or refractory shapes are formed by preparing a low viscosity, pourable aqueous-based suspension. The aqueous suspension preferably contains ceramic or metal particulates, water, and a compatible mixture of additives for performing dispersant, cryoprotectant, and strength enhancing functions. The low viscosity slip is cast or injection molded at low pressure into a complex mold, frozen, demolded, and freeze dried without the formation of a continuous liquid phase. The green part is subsequently sintered by conventional techniques to achieve a dense part.

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