Process and apparatus for producing amtospheres for high productivity carburizing
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, H 2 , CO 2 , H 2 O, CH 4 and N 2 , such that the product of the %CO and %H 2 is greater than about 1600; the ratio of CO/CO 2 is greater than 10; and the ratio of H 2 /H 2 O 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.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A process for carburizing steel parts in a furnace comprising
a. introducing into said furnace a gas mixture comprising CO, H 2 , CO 2 , H 2 O, CH 4 and N 2 such that the product of the %CO and %H 2 is greater than about 1600; the ratio of CO/CO 2 is greater than 10; and the ratio of H 2 /H 2 O is greater than about 10; and b. controlling the gas mixture in said furnace for less than about 5 minutes.
2 . The process of claim 1 wherein said product of %CO and %H 2 is greater than about 2000.
3 . The process of claim 1 wherein said gas mixture is controlled in the furnace for less than about 3 minutes.
4 . The process of claim 3 wherein said gas mixture is controlled in the furnace for less than about 1 minute.
5 . A process for carburizing steel parts in a furnace comprising
a. introducing into said furnace a gas mixture comprising CO, H 2 , CO 2 , H 2 O, CH 4 and N 2 such that the product of the %CO and %H 2 is greater than about 1600, the ratio of CO/CO 2 is greater than 10, and the ratio of H 2 /H 2 O is greater than about 10; said gas mixture being generated by a mixture of CH 4 and CO 2 over a noble gas catalyst on an ceramic carrier at the temperature range of between about 850° C. and 950° C.; and b. controlling the gas mixture in said furnace for less than about 5 minutes.
6 . The process of claim 5 wherein said product of %CO and %H 2 is greater than about 2000.
7 . The process of claim 5 wherein said noble gas catalyst is platinum.
8 . The process of claim 5 wherein said noble gas catalyst is rhodium.
9 . The process of claim 5 wherein said ceramic carrier is an alumina carrier.
10 . The process of claim 5 wherein said gas mixture is generated by a reactor that comprises a cylindrically symmetric body; a first central tube containing electrical heating elements for gas flow; a second central tube concentrically disposed around said first central tube; and a plurality of catalyst beds disposed in an annular space in a segmented fashion around said second central tube.
11 . The reactor of claim 10 comprising six catalyst beds disposed in an annular space in a segmented fashion around said second central tube.
12 . A reactor for generating a gas mixture for carburizing steel which comprises
a. a cylindrically symmetric body; b. a first central tube containing electrical heating elements for gas flow; c. a second central tube concentrically disposed around said first central tube; and d. a plurality of catalyst beds disposed in an annular space in a segmented fashion around said second central tube.
13 . The reactor of claim 12 comprising six catalyst beds disposed in an annular space in a segmented fashion around said second central tube.
14 . The reactor of claim 12 wherein said electrical heating elements maintains the gas mixture about 850° C. to about 950° C.Join the waitlist — get patent alerts
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