Method of forming fine dispersion of ceria in tungsten

Details Method of forming fine dispersion of ceria in tungsten Method of forming fine dispersion of ceria in tungsten

1992-06-01

1994-02-08

Wyszomierski, George

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 19, 419 38, 419 45, 75359, 75361, 75365, B22F 924

Patent

active

052846148

ABSTRACT:
Doped tungsten powder, or sintered tungsten bodies formed therefrom, having a fine dispersion of oxide particles of at least one metal from the group zirconium, hafnium, lanthanum, yttrium, and rare earth's are formed by the method of this invention. A mixture of a salt solution comprised of a soluble salt of the metal, and a tungsten blue oxide powder is formed. A hydroxide precipitating solution is admixed with the mixture to form a hydroxide precipitate of the metal on the tungsten blue oxide powder. The tungsten blue oxide powder and hydroxide precipitate are heated in a reducing atmosphere to form the tungsten powder having the dispersion of oxide particles. The doped tungsten powder can be consolidated and sintered to form tungsten bodies having a fine dispersion of the metal oxide.

REFERENCES:
patent: 3475159 (1969-10-01), hansen
patent: 4156053 (1979-05-01), Baranow
patent: 4678718 (1987-07-01), Wang
patent: 4787561 (1988-11-01), Kemp et al.
patent: 4923673 (1990-05-01), Litty

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