Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1989-07-24
1989-12-12
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 14, 419 33, 419 36, 419 37, 419 40, 75 05BC, B22F 100
Patent
active
048866385
ABSTRACT:
A method is disclosed for producing metal carbide grade powders, which comprises dry milling metal carbide powder which can be tungsten carbide, titanium carbide, tantalum carbide, niobium carbide, vanadium carbide, chromium carbide, and combinations thereof to increase the surface area of the powder particles to result in essetially all of the powders being converted to single crystals, forming a mixture of the resulting dry milled carbide powder, a binder metal which can be cobalt, nickel, and combinations thereof, and a wax, while heating the carbide powder, the binder metal and the wax to a temperature above the melting point of the wax and maintaining the temperature to result in a uniform distribution of the wax on the carbide and binder metal particles, forming a slurry of the 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 mixture and aggiomerating 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 from about 1350.degree. C. to about 1540.degree. C.
REFERENCES:
patent: 3888662 (1975-06-01), Boeckler
patent: 3964878 (1976-06-01), Scheithauer et al.
patent: 4011291 (1977-03-01), Curry
patent: 4497559 (1985-01-01), Grab et al.
patent: 4554130 (1985-11-01), Ecer
patent: 4630692 (1986-12-01), Ecer
Burwick Jack L.
Penkunas Joseph J.
Smith Theodore E.
GTE Products Corporation
Lechert Jr. Stephen J.
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