Method of forming improved tungsten ingots

Details Method of forming improved tungsten ingots Method of forming improved tungsten ingots

1990-08-03

1991-05-28

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Consolidation of powder prior to sintering

419 23, 419 42, 419 58, 75248, B22F 100

Patent

active

050193309

ABSTRACT:
A method of forming tungsten ingots having improved uniformity of density and improved uniformity in distribution of dopant within the ingot is disclosed. Doped tungsten powder is disposed in a cylindrical mold having sealing means at both ends. The powder completely fills a void space within the mold between the sealing means so that there is substantially no settling of the powder. A pressure of about 560 kg/cm.sup.2 is applied uniformly to the outer surface of the mold to form a cylindrical compact. The compact is removed from the mold and resistance sintered to a density of at least about 85 percent of theoretical density to form the ingot.

REFERENCES:
patent: 3443143 (1969-05-01), Koo
patent: 3661536 (1972-05-01), Shimizu et al.
patent: 3838486 (1974-10-01), Millner et al.
patent: 3853492 (1974-12-01), Millner et al.
patent: 3927989 (1975-12-01), Koo
patent: 4931252 (1990-06-01), Brunisholz
"The Application of Tungsten Wire as the Light Source in Incandescent Electric lamps", D. J. Jones, Metallurgy and Material Technology, vol. 5, No. 10, pp. 503-512, 1973.
"Tooling for Cold Isostatic Pressing", Isostatic Pressing Technology, Applied Science Publishers, New York, edited by P. J. James, 1983, Chapter 4, pp. 90-123 & 160-161.

Affiliated with

Also associated with

Rating

Method of forming improved tungsten ingots does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of forming improved tungsten ingots, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of forming improved tungsten ingots will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-34767