Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1991-03-13
1993-06-08
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 65, 264102, 264313, 264317, 264517, 419 38, 419 39, 419 66, C04B 3564, B22F 304
Patent
active
052176649
ABSTRACT:
Process for the production of a component, in which metal or ceramic powder (6) is applied under centrifugal force to the inner wall of a gas-permeable mold (13), which is under reduced pressure and is located in a reduced-pressure vessel (10), and precompacted, after which the mold (13) is removed from the vessel (10) and sintered. The mold (13) consists of a heap of ceramic grains with an organic binder having high strength between room temperature and a temperature just below the sintering temperature, in order to support the powder (6) to be sintered to give the component. When sintering starts, the binder evaporates or burns away, as a result of which the mold (13) substantially loses its supporting action for the component. Binder: aminolic, phenolic, furan resin.
REFERENCES:
patent: 2513785 (1950-07-01), Browne
patent: 4473526 (1984-09-01), Buhler
patent: 4582682 (1986-04-01), Betz
patent: 4927600 (1990-05-01), Miyashita
"Slip Casting of Metal Powders", Chapter 13, Henry H. Hausner, pp. 221-238.
Asea Brown Boveri Ltd.
Derrington James
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