Method for cooling metal parts having undergone a nitriding/nitrocarburising treatment in a molten salt bath, unit for implementing said method and the treated metal parts
US9464346B2 · kind B2 · utility
1Cited by
3References
10Claims
0Family size
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Key dates
| Filing date | Jul 12, 2012 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Jun 2, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/54
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Before the end of the treatment of metal parts in a molten salt bath nitriding/nitrocarburizing station, a chamber, arranged so that the oxygen contained in the chamber can be discharged in order to create an inert atmosphere, is filled with a refrigerant in liquid form and with a strong capacity for volume expansion as it evaporates. All the parts treated are transferred into the chamber. The chamber is closed, and the parts are left in the chamber for a preset length of time to reach a temperature at which the salt congeals and forms a protective barrier. The parts are then removed and subjected to a rinsing operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.