Thermochemical treatment system and process
US4181541A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 1978 |
| Grant date | Jan 1, 1980 |
| Priority date | — |
| Expiry date | Feb 7, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/36
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Thermochemical Treatment System and Process for the treatment of steel or steel alloys by ionic bombardment. Two successive stages of operation are involved in which during the first stage, a DC voltage is applied across the electrodes of a furnace so that the furnace operates at a point far enough away from the arc formation zone to prevent formation of an arc and lies in the zone of abnormal discharge. During the second stage, a succession of pulses of voltage pulses of high voltage but of limited energy is applied to the furnace electrodes, and the operating point of the furnace moves along the voltage-intensity curve to a limit point far enough away from the arc formation zone, so that no arc formation takes place.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.