Reduction of oxides from metal powders wherein the de-oxidized p

Details Reduction of oxides from metal powders wherein the de-oxidized p Reduction of oxides from metal powders wherein the de-oxidized p

1992-03-18

1995-04-11

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 23, 419 58, 75369, B22F 700

Patent

active

054055725

ABSTRACT:
A method for the reduction of oxides in a powder metal requires a predetermined quantity of powder to be loaded into a retort tube or other type of furnace which is pumped down to a vacuum less than about 5.times.10.sup.-6 Torr. The retort is ramped up to a temperature of about 500.degree.-750.degree. C. and maintained at that temperature under high vacuum for about 30-60 minutes to obtain reduction of oxides and de-gasing of copper powders of screen mesh sizes of -100. A hydrogen partial pressure of 150 microns to 20 mm of Hg may be valved into the system from standard grade hydrogen gas 15 minutes into approximately the 30-60 minute hold temperature ramp and then valved off on cooling to 400.degree. C. to improve oxide removal. The system is returned to the high vacuum mode and furnace cooled to room temperature.

REFERENCES:
patent: 4772488 (1988-09-01), Pinch et al.
patent: 4871608 (1989-10-01), Kondo et al.
patent: 4877555 (1989-10-01), Yuhaku et al.
patent: 4880567 (1989-11-01), Prabhu et al.
patent: 4891246 (1990-01-01), McEwen et al.
patent: 4937016 (1990-06-01), Suehiro et al.
patent: 5014420 (1991-05-01), Howard et al.
Copper Base Powder Metallurgy, Metal Powder Industries Federation, New Jersey, 1980, pp. 14-19.

Affiliated with

Also associated with

Rating

Reduction of oxides from metal powders wherein the de-oxidized p does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reduction of oxides from metal powders wherein the de-oxidized p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reduction of oxides from metal powders wherein the de-oxidized p will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1536703