Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Patent
1989-09-11
1990-02-20
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
75 5A, 75 5AA, 75 5AC, 419 36, 419 37, 419 40, 419 65, 419 66, 419 35, 419 64, B22F 100
Patent
active
049024710
ABSTRACT:
A method is disclosed for producing metal carbide grade powders, which comprises forming a wax mixture consisting essentially of in percent by weight about 10 to 60 of an organic compound additive which is a solid at room temperature and contains a C.dbd.O group, about 5 to about 50 oils, and the balance paraffin, heating the wax mixture to a temperature above the melting point of the wax mixture and maintaining the temperature, forming a powder-wax mixture of metal carbide powder, a binder metal selected from the group consisting of cobalt, nickel, and combinations thereof, and the wax mixture, while heating the carbide powder, binder metal and wax mixture to a temperature above the melting point of the wax mixture and maintaining the temperature, 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, and removing the water from the resulting attritor milled powder-wax mixture and agglomerating the mixture to produce the metal carbide grade powder wherein a densified article made therefrom exhibits essentially no pores that are greater than about 10 micrometers in diameter after sintering at about 1350.degree. C. to 1540.degree. C.
REFERENCES:
patent: 4011291 (1977-03-01), Curry
patent: 4397889 (1983-08-01), Benjamin et al.
patent: 4478888 (1984-10-01), Benjamin et al.
patent: 4491559 (1985-01-01), Grab et al.
patent: 4830994 (1989-05-01), Schuetz
Penkunas Joseph J.
Smith, Jr. Theodore E.
GTE Products Corporation
Koris David J.
Lechert Jr. Stephen J.
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