Injection-molding of metal or ceramic powders

Details Injection-molding of metal or ceramic powders Injection-molding of metal or ceramic powders

1992-05-14

1993-11-02

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

264 63, 264118, 2643282, 26432817, 419 36, C04B 3564, B29C 4572

Patent

active

052581551

ABSTRACT:
Provided is an injection-molding method for forming into given finished parts by injection-molding raw materials of a metal or ceramic powder feed, in which steps of coating a release agent to the mold, degreasing and freeze solidification are dispensed with. In this method, a metal or ceramic powder feed is kneaded with an agar sol comprising water, which may have or have not been treated magnetically, agar powders having a gel strength of 2000 g/cm.sup.2 at an least 2% concentration and sodium borate to form a clay form of sol-state plastic material, and this material is then put in a heat-retaining hopper of injection-molding equipment in which it is injection-molded. Alternatively, this clay form of plastic material is cooled for gelation and pelletization (to obtain finely granulated gels). The pellets are put in a hopper of injection-molding equipment in which it is formed while heated and melted. The elasticity and viscosity of an agar solution is much more improved by adding sodium borate to a sol-state agar solution.

REFERENCES:
patent: 4624812 (1986-11-01), Farrow et al.
patent: 4649003 (1987-03-01), Hashimoto et al.
patent: 4734237 (1988-03-01), Fanelli et al.
patent: 4783297 (1988-11-01), Ito et al.
patent: 5047182 (1991-09-01), Sundback et al.

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