Process for a rapid and homogeneous carburization of a charge in a furnace
US4744839A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1986 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Jul 15, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/22
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The process comprises opening the door of the furnace, introducing a charge into the furnace which was previously conditioned at the carburization temperature, closing the door of the furnace, subjecting the charge to a first phase, termed carburization phase, in the course of which the rate of transfer of the carbon of the atmosphere to the surface of the workpiece is preponderant relative to the rate of diffusion of the carbon from the surface of the workpiece to the interior of the workpiece, then to a second phase, termed diffusion phase, in the course of which said rate of diffusion becomes preponderant relative to said rate of transfer, the charge being possibly cooled before the opening of the door of the furnace so as to permit its extraction and the introduction of a new charge, a carrier gas, to which hydrocarbon may be added, being introduced into the furnace throughout the duration of the process. According to the invention, the flow rate D.sub.1 of carrier gas during the carburization phase is related to the flow rate D.sub.2 of carrier gas during the diffusion phase by the relation EQU 1.2 D.sub.2 .ltoreq.D.sub.1 .ltoreq.2.times.D.sub.2, the flow rate D.sub.2 being hi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.