Fine grain tungsten heavy alloys containing additives

Details Fine grain tungsten heavy alloys containing additives Fine grain tungsten heavy alloys containing additives

1989-10-02

1991-01-22

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 38, 419 47, 419 57, B22F 100

Patent

active

049869612

ABSTRACT:
A consolidated tungsten heavy alloy body consisting essentially of from about 88% to about 98% by weight of tungsten, from about 0.25% to about 1.5% by weight of a grain size reducing additive selected from the group consisting of ruthenium, rhenium and mixtures thereof, balance iron and nickel in a weight ratio of nickel to iron of from about 1:1 to about 9:1 wherein the consolidated body has greater than about 2500 grains per square millimeter as determined from the microstructure of the body. A process for producing the consolidated body comprises forming a relative uniform blend of the described metal powders, compacting the powders to form a green body then solid state sintering to remove binders followed by liquid phase sintering the green body to full density.

REFERENCES:
patent: 4012230 (1977-03-01), Dickinson et al.
patent: 4612162 (1986-09-01), Morgen et al.
patent: 4784690 (1988-11-01), Mullendore
patent: 4851042 (1989-07-01), Bose et al.
patent: 4885031 (1989-12-01), Spencer et al.
patent: 4938799 (1990-07-01), Nicolas

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