Method of producing metal carbide grade powders and controlling

Details Method of producing metal carbide grade powders and controlling Method of producing metal carbide grade powders and controlling

1990-09-10

1991-09-03

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 17, 419 18, 419 33, 419 65, 419 66, 75252, 75255, B22F 100

Patent

active

050452770

ABSTRACT:
A method for producing metal carbide grade powders which comprises forming a wax mixture consisting essentially of in percent by weight about 5 to about 15 paraffin oil, with the balance being an esterified wax and paraffin, heating the wax mixture to a temperature above the melting point to melt the wax mixture and maintain it in the molten state, forming a powder-wax mixture consisting essentially of metal carbide powder, a binder metal, and the wax mixture while heating to a temperature above the melting point of the wax mixture to maintain the wax mixture in the molten state to result in a uniform distribution of the wax mixture on the carbide and binder metal particles, forming a slurry of the powder-wax mixture and water, attritor milling the slurry at a temperature below the melting point of the wax mixture, and removing water and agglomerating to produce metal carbide grade powder wherein a densified article made therefrom exhibits less linear shrinkage than articles made from carbide grade powder absent the esterified wax. The shrinkage decreases as the content of esterified wax in the wax mixture increases.

REFERENCES:
patent: 4070184 (1978-01-01), Scheithaver et al.
patent: 4849165 (1989-07-01), Schaefer
patent: 4886638 (1989-12-01), Penkunas et al.
patent: 4902471 (1990-02-01), Penkunas et al.

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