Sintered parts made of oxygen-sensitive non-reducible powders an

Details Sintered parts made of oxygen-sensitive non-reducible powders an Sintered parts made of oxygen-sensitive non-reducible powders an

1996-07-29

1997-02-18

Jordan, Charles T.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 33, 419 36, 419 38, 419 41, 419 53, 419 54, B22F 316

Patent

active

056049196

ABSTRACT:
The preferred sintered parts made of oxygen-sensitive, non-reducible powders and their production by injection-molding are distinguished by the powders used being freed of their oxide layer by attritor milling in a water-free organic solvent, in the presence or absence of an additional reductant, the oxide particles being removed if necessary by filtration or screening in the presence of the organic solvent, the oxide-free powder being mixed as suspension with a polyacetal as binder under a protective gas, the organic solvent being distilled off, the mixture of powder and polyacetal being heated above the melting point of the polyacetal and being compounded to give a homogeneous composition, the granular material thus obtained being processed in an injection-molding machine made inert with argon to give shaped bodies, the shaped bodies being freed of binder under the action of oxalic acid in a closed ceramic container which nevertheless allows pressure equilibration under protective gas at atmospheric pressure or reduced pressure, the shaped bodies being, after binder removal, transferred in their container without contact with air into a sintering furnace and being sintered therein according to the prior art.

REFERENCES:
patent: 3708285 (1978-01-01), Scheyer et al.
patent: 4778515 (1988-10-01), Kemp, Jr. et al.
patent: 4917859 (1990-04-01), Hamo
patent: 5439964 (1995-08-01), Ohst et al.
Randell M. German "Powder Metallurgy Science" Metal Powder Industries Federation (1984) Princeton, New Jersey pp. 189-194.

Affiliated with

Also associated with

Rating

Sintered parts made of oxygen-sensitive non-reducible powders an does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sintered parts made of oxygen-sensitive non-reducible powders an, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sintered parts made of oxygen-sensitive non-reducible powders an will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1609256