Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Special medium during sintering
Patent
1995-06-01
1997-03-18
Jordan, Charles T.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Special medium during sintering
148559, 148708, B22F 100
Patent
active
056131852
ABSTRACT:
The present invention discloses novel nitrogen-hydrogen based atmospheres for sintering steel components in continuous furnaces with consistent quality and properties while prolonging the life of the wire mesh belts, reducing maintenance costs, and improving furnace productivity. Specifically, it discloses the use of a controlled amount of an oxidizing agent such as moisture, carbon dioxide, nitrous oxide, or mixtures thereof along with nitrogen-hydrogen atmospheres. The amount of an oxidizing agent added to the nitrogen-hydrogen atmospheres to pre-condition belt material prior to its use for sintering and to sinter steel components is controlled in such a way that atmospheres become oxidizing to the belt material but reducing to steel components being sintered, specifically in the high heating and cooling zones of continuous furnaces.
REFERENCES:
patent: 4334938 (1982-06-01), Shay et al.
patent: 5348592 (1994-09-01), Garg et al.
patent: 5417744 (1995-06-01), Garg et al.
Berger Kerry R.
Bowe Donald J.
Garg Diwakar
Marsden James G.
Mitchell, Jr. David L.
Air Products and Chemicals Inc.
Chi Anthony R.
Jones II Willard
Jordan Charles T.
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