Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Patent
1993-04-23
1994-08-23
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
419 36, 419 40, 419 44, 419 53, 419 10, 419 13, 419 14, B22F 312, B22F 322
Patent
active
053405323
ABSTRACT:
A method for manufacturing a sintered body by a) forming a slurry comprising a powder mixture, a dispersant providing steric stabilization for the powders and an organic solvent with a possible addition of one or more soluble polymers; b) transferring the slurry into a mold; and c) changing the temperature sufficient to cause gelation of the sterically stabilized suspension to form a green body. The method also includes d) removing the green body from the mold; e) transferring the green body to a chamber where the gelation temperature can be maintained and the pressure decreased to facilitate removal of the solvent to form a dried body; f) heating the body for a time sufficient to substantially remove the dispersant from the body and; g) sintering the body. The sintered body can be an insert for metal cutting tools.
REFERENCES:
patent: 4541855 (1985-09-01), Scherer
patent: 4721599 (1988-01-01), Nakamura et al.
patent: 4894194 (1990-01-01), Janney
patent: 5047182 (1991-09-01), Sundback et al.
Greaves John N.
Sandvik AB
Walsh Donald P.
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