Method for producing a component by means of powdery...

Details Method for producing a component by means of powdery... Method for producing a component by means of powdery...

2006-03-28

2006-03-28

Theisen, Mary Lynn (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Introducing material under pressure into mold

C264S674000, C264S677000, C264S344000

Reexamination Certificate

active

07018583

ABSTRACT:
According to a known method for producing a component by means of a powdery starting material, powder is mixed with auxiliaries comprising binding agents, whereby a free-flowing mass is produced. A green body is produced from the mass by means of powder injection moulding. A portion of the auxiliaries is extracted by heating the green body in a container and exposing said body to a stream of solvents. The green body is sintered, whereby the component is produced. The aim of the invention is to enable fast and gentle extraction for releasing green bodies which are produced by means of powder injection moulding. According to the invention, the extraction comprises a heating-up phase during which the temperature of the green body is permanently or gradually increased and the green body is overflown by solvent in the form of a compressed, supercritical treatment gas. An extractor that is suitable for carrying out said method is characterised by a pressure sealed housing that is provided with at least one lateral limiting wall and encloses a treatment chamber for receiving a carrier element which is loaded with a plurality of green bodies. Said housing is provided with a lock-up load and removal opening for the green bodies. Said opening is configured in the lateral limiting wall as a passage for the carrier element.

REFERENCES:
patent: 5604919 (1997-02-01), Sterzel et al.
patent: 2002/0043737 (2002-04-01), Zhong et el.
Shimizu et al, “A Debinding Method Using Supercritical CO2 on MIM Process,” 1996, Adv. Powder Metall. Part. Mat., vol. 5, Nr. 19, pp. 207-212.
R. M. German, “Powder Injection Molding,” 1990, Metal Powder Indus. Fed., pp. 325-327,332-345.

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