Plastic article or earthenware shaping or treating: apparatus – Means for molding powdered metal
Reexamination Certificate
2008-07-01
2008-07-01
Gupta, Yogendra N. (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Means for molding powdered metal
C425S167000, C425S174600, C425S407000, C425S412000, C425S415000
Reexamination Certificate
active
11022512
ABSTRACT:
A system is capable of making a metallic product with robust mechanical and electrical properties. The system includes a pressing stage configured to compress powder (e.g., MMC material) to form a green compact from the powder, a sintering stage configured to sinter the green compact to form a sintered structure from the green compact, and a consolidation stage configured to apply electric current to the sintered structure to form the metallic product from the sintered structure. The electric current is in the form of high density, short electric AC or DC pulses and results in consolidation of the sintered structure at grain boundaries to correct defects in the boundaries (e.g., areas of high electrical resistance) without melting the bulk metal to produce the metallic product. Such a system alleviates the need for coining process, which could fracture bonds and thus weaken the structure, following the sintering process.
REFERENCES:
patent: 531197 (1894-12-01), Lemp
patent: 2473245 (1949-06-01), Hanna
patent: 2890324 (1959-06-01), Havlik
patent: 3988913 (1976-11-01), Metcalfe et al.
patent: 3988914 (1976-11-01), Metcalfe et al.
patent: 4307280 (1981-12-01), Ecer
patent: 4532793 (1985-08-01), Bezold
patent: 5042281 (1991-08-01), Metcalfe
patent: 5071333 (1991-12-01), Burt et al.
patent: 5515705 (1996-05-01), Weldon et al.
patent: 6383446 (2002-05-01), Tokita
patent: 6489584 (2002-12-01), Kelly
patent: 6767505 (2004-07-01), Witherspoon et al.
patent: 7028522 (2006-04-01), Kim et al.
patent: 91642 (1987-05-01), None
Nader G. Dariavach, “The Effect of High Density Electric Pulses on Sintered Aluminum 201AB SiC MMC PM Compacts During Plastic Deformation”, Oct. 2002, pp. 1-176.
Nader G. Dariavach and James A. Rice, “Electromigration and the Electroplastic Effect in Aluminum SiC MMCs”, May 2000, pp. 40-42.
Dariavach Nader G.
Rice James A.
BainwoodHuang
EMC Corporation
Gupta Yogendra N.
Nguyen Thu Khanh T.
LandOfFree
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