Aqueous process for injection molding ceramic powders at high so

Details Aqueous process for injection molding ceramic powders at high so Aqueous process for injection molding ceramic powders at high so

1992-03-31

1993-10-05

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432814, 26432817, 264 63, 264109, C04B 3564

Patent

active

052502511

ABSTRACT:
A process for shaping parts from ceramic powder that comprises the steps of (1) forming a concentrated mixture in excess of 40% ceramic solids by volume, the mixture comprising ceramic powder, a gel forming material chosen from the class of polysaccharides known as "agaroids", and a gel forming material solvent and being formed in a blender that provides a shearing action and is heated to raise the temperature of the mixture to about 70.degree. C. to 100.degree. C.; and (2) molding the mixture at a temperature sufficient to produce a self-supporting structure comprising the powder and gel. The parts exhibit excellent green strength and are rapidly fired without cracking, distortion or shrinkage problems.

REFERENCES:
patent: 4113480 (1978-09-01), Rivers
patent: 4734237 (1988-03-01), Fanelli
patent: 5087595 (1992-02-01), Marsh
H. H. Selby et al., "Agar", Industrial Gums, Academic Press, New York, N.Y., 2nd. ed., (1973), Chapter 3, p. 29.

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