Setting and controlling desired redox potentials in gases
US4202690A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1977 |
| Grant date | May 13, 1980 |
| Priority date | — |
| Expiry date | Oct 3, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27D7/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Method for controlling desired redox potential in hydrogencontaining protective gases used in high-temperature furnaces in powder-metallurgical processes. A sample of the protective gas is withdrawn from the furnace and the redox potential of the sample measured at the high temperature to produce treated bodies of good quality. Humidifying the gases blowing through the furnace is employed to erase or minimize a deviation of the redox potential of the sample from a predetermined redox potential. Ax oxygen-hydrogen mixture may be obtained by electrolysis of water as a function of the measured redox potential and this mixture may be used for humidification. In this manner good quality end products are assured despite fluctuations in throughput and properties of material entering the furnace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.