Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Autogenously or by activation of dry coated particles
Patent
1992-05-27
1994-11-22
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Autogenously or by activation of dry coated particles
264 63, 2643281, 419 36, 419 37, B29C 4500, B22F 100
Patent
active
053666798
ABSTRACT:
A process for thermal debinding and sintering of a workpiece made by molding a mixture of a binder and a powder, the process entailing the steps of injection molding a workpiece entailing at least 30% vol. of binder, the binder containing from about 70% to about 90% wt. of at least one wax and from about 10% to 30% wt. of high molecular weight polymer, introducing the molded workpiece in an enclosure at ambient temperature, injecting an atmosphere of at least 95% vol. hydrogen and less than 5% vol. water vapor, heating the enclosure and/or the workpiece until reaching a temperature between about 150.degree. C. to about 200.degree. C., maintaining the temperature during a period of time sufficient to substantially decompose all the waxes in the binder, then heating again the enclosure and/or the workpiece to reach a temperature of about 700.degree. C. while substantially eliminating the rest of the binder, maintaining the temperature until the workpiece is substantially sintered, cooling the enclosure and the workpiece to reach a temperature where no substantial oxidation can occur, then withdrawing the workpiece from the enclosure.
REFERENCES:
patent: 4404166 (1983-09-01), Wiech, Jr.
patent: 4609527 (1986-09-01), Rinderle et al.
patent: 5009841 (1991-04-01), Bloemacher et al.
patent: 5021208 (1991-06-01), Ludwig et al.
patent: 5028367 (1991-07-01), Wei et al.
Kuhns Allan R.
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
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