Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Reexamination Certificate
2005-11-29
2005-11-29
Jenkins, Daniel (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
C148S207000, C148S215000, C148S216000
Reexamination Certificate
active
06969430
ABSTRACT:
This invention is directed to a process and apparatus for producing high productivity carburizing. A process is introduced that uses a gas mixture made up of CO, H2, CO2, H2O, CH4and N2, such that the product of the % CO and % H2is greater than about 1600; the ratio of CO/CO2is greater than 10; and the ratio of H2/H2O is greater than about 10. The gas mixture is controlled for a short time. A reactor for generating a gas mixture for carburizing steel is also introduced. This reactor is composed of a cylindrically symmetric body; a first central tube containing electrical heating elements for gas flow; a second central tube concentrically disposed around the first central tube; and a plurality of catalyst beds disposed in an annular space in a segmented fashion around the second central tube.
REFERENCES:
patent: 4049472 (1977-09-01), Arndt
patent: 4145232 (1979-03-01), Solomon
patent: 4306918 (1981-12-01), Kaspersma et al.
patent: 4519853 (1985-05-01), Kostelitz et al.
patent: 5676769 (1997-10-01), Kawamura et al.
patent: WO 9955921 (1999-10-01), None
R. Strigl “Carboquick”, GASWARME International 45 (1996) p560ff.
T. Naito & K. Ogihara, “Examined the Direct Carburizing Method”, Proc. 2ndIntl. Conf. On Carburizing & Nitriding with Atmospheres, Cleveland 1995 p43ff.
N. Kanetake & S. Takahasi, “Carburizing with CO-enriched gas.” —Proc. 2ndIntl. Conf. On Carburizing & Nitriding with Atmospheres, Cleveland 1995 p157ff.
Barlow Alan Russell
Van den Sype Jaak Stefaan
Viotto Edison
Jenkins Daniel
Praxair Technology Inc.
LandOfFree
Process and apparatus for producing atmosphere for high... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and apparatus for producing atmosphere for high..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and apparatus for producing atmosphere for high... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3506054